diff --git a/src/test/java/com/google/api/generator/engine/BUILD.bazel b/src/test/java/com/google/api/generator/engine/BUILD.bazel
index e4cead379e..54b08dfd36 100644
--- a/src/test/java/com/google/api/generator/engine/BUILD.bazel
+++ b/src/test/java/com/google/api/generator/engine/BUILD.bazel
@@ -16,10 +16,12 @@ TESTS = [
 [java_test(
     name = test_name,
     srcs = ["{0}.java".format(test_name)],
+    data = ["//src/test/java/com/google/api/generator/engine/goldens:goldens_files"],
     test_class = "com.google.api.generator.engine.{0}".format(test_name),
     deps = [
         "//src/main/java/com/google/api/generator/engine/ast",
         "//src/main/java/com/google/api/generator/engine/writer",
+        "//src/test/java/com/google/api/generator/test/framework",
         "@junit_junit//jar",
     ],
 ) for test_name in TESTS]
diff --git a/src/test/java/com/google/api/generator/engine/JavaCodeGeneratorTest.java b/src/test/java/com/google/api/generator/engine/JavaCodeGeneratorTest.java
index d9aa8fb0f2..3383fb94b0 100644
--- a/src/test/java/com/google/api/generator/engine/JavaCodeGeneratorTest.java
+++ b/src/test/java/com/google/api/generator/engine/JavaCodeGeneratorTest.java
@@ -14,8 +14,6 @@
 
 package com.google.api.generator.engine;
 
-import static junit.framework.Assert.assertEquals;
-
 import com.google.api.generator.engine.ast.AnnotationNode;
 import com.google.api.generator.engine.ast.AnonymousClassExpr;
 import com.google.api.generator.engine.ast.AssignmentExpr;
@@ -51,8 +49,11 @@
 import com.google.api.generator.engine.ast.VariableExpr;
 import com.google.api.generator.engine.ast.WhileStatement;
 import com.google.api.generator.engine.writer.JavaWriterVisitor;
+import com.google.api.generator.test.framework.Assert;
 import java.io.FileWriter;
 import java.io.IOException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
@@ -61,6 +62,8 @@
 import org.junit.Test;
 
 public class JavaCodeGeneratorTest {
+  private static final String GOLDENFILES_DIRECTORY =
+      "src/test/java/com/google/api/generator/engine/goldens/";
   // Create shared VaporReferences.
   private static final VaporReference stubRef = createVaporReference("com.google.gax.grpc", "Stub");
   private static final VaporReference bookKindRef =
@@ -169,7 +172,8 @@ public void validJavaClass() {
             .build();
     JavaWriterVisitor javaWriterVisitor = new JavaWriterVisitor();
     libraryServiceStubClass.accept(javaWriterVisitor);
-    assertEquals(javaWriterVisitor.write(), EXPECTED_CLASS_STRING);
+    Path goldenFilePath = Paths.get(GOLDENFILES_DIRECTORY, "JavaCodeGeneratorTest.golden");
+    Assert.assertCodeEquals(goldenFilePath, javaWriterVisitor.write());
   }
 
   // Private helpers.
@@ -744,156 +748,4 @@ private ClassDefinition createNestedClassNovel() {
             Arrays.asList(createOverrideCreateBookMethod(novelClassRef, bookKindNovelEnumExpr)))
         .build();
   }
-
-  private static final String EXPECTED_CLASS_STRING =
-      "/*\n"
-          + " * Copyright 2020 Gagpic-generator-java\n"
-          + " *\n"
-          + " * Licensed description and license version 2.0 (the \"License\");\n"
-          + " *\n"
-          + " *    https://www.foo.bar/licenses/LICENSE-2.0\n"
-          + " *\n"
-          + " * Software distributed under the License is distributed on an \"AS IS\" BASIS.\n"
-          + " * See the License for the specific language governing permissions and\n"
-          + " * limitations under the License.\n"
-          + " */\n"
-          + "\n"
-          + "package com.google.example.library.core;\n"
-          + "\n"
-          + "import com.google.exmaple.library.LibraryService;\n"
-          + "import com.google.exmaple.library.core.LibraryServiceStub;\n"
-          + "import com.google.exmaple.library.v1.BookKind;\n"
-          + "import com.google.gax.grpc.Stub;\n"
-          + "import java.io.FileWriter;\n"
-          + "import java.io.IOException;\n"
-          + "import java.util.ArrayList;\n"
-          + "import java.util.HashMap;\n"
-          + "import java.util.List;\n"
-          + "import java.util.Stack;\n"
-          + "\n"
-          + "/**\n"
-          + " * Service Description: This is a test comment.\n"
-          + " *\n"
-          + " * <pre><code>\n"
-          + " * LibraryServiceStub libServiceStub = new LibraryServiceStub()\n"
-          + " * </code></pre>\n"
-          + " *\n"
-          + " * <ol>\n"
-          + " *   <li>A \"flattened\" method.\n"
-          + " *   <li>A \"request object\" method.\n"
-          + " *   <li>A \"callable\" method.\n"
-          + " * </ol>\n"
-          + " *\n"
-          + " * @deprecated This is a deprecated message.\n"
-          + " */\n"
-          + "@SuppressWarnings(\"all\")\n"
-          + "@Deprecated\n"
-          + "@Override\n"
-          + "public class LibraryServiceStub extends Stub implements LibraryService {\n"
-          + "  private static final String serviceName = \"LibraryServiceStub\";\n"
-          + "  protected List<Shelf> shelfList;\n"
-          + "  public static HashMap<String, Shelf> shelfMap;\n"
-          + "\n"
-          + "  public LibraryServiceStub() {\n"
-          + "    super();\n"
-          + "    this.shelfList = new ArrayList<>();\n"
-          + "    shelfMap = new HashMap<>();\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public String addShelf(String name, double seriesDoubleNum) {\n"
-          + "    int seriesNum = ((int) seriesDoubleNum);\n"
-          + "    if (condition) {\n"
-          + "      return \"Series number equals to max int value.\";\n"
-          + "    }\n"
-          + "    shelfList.add(new Shelf(name, seriesNum));\n"
-          + "    if (shelfMap.containsKey(name)) {\n"
-          + "      return \"Shelf is already existing in the map.\";\n"
-          + "    }\n"
-          + "    shelfMap.put(name, new Shelf(name, seriesNum));\n"
-          + "    return \"Shelf added.\";\n"
-          + "  }\n"
-          + "\n"
-          + "  public void updateShelfMap(Shelf newShelf) throws Exception {\n"
-          + "    if (shelfMap.containsKey(newShelf.shelfName)) {\n"
-          + "      shelfMap.put(newShelf.shelfName, newShelf);\n"
-          + "    } else {\n"
-          + "      throw new Exception(\"Updating shelf is not existing in the map\");\n"
-          + "    }\n"
-          + "  }\n"
-          + "\n"
-          + "  public void printShelfListToFile(String fileName) {\n"
-          + "    StringBuilder sb = new StringBuilder();\n"
-          + "    try {\n"
-          + "      FileWriter fileWriter = new FileWriter(fileName);\n"
-          + "      for (Shelf s : shelfList) {\n"
-          + "        sb.append(s.shelfName).append(s.seriesNum);\n"
-          + "      }\n"
-          + "      fileName.write(sb.toString());\n"
-          + "      fileName.close();\n"
-          + "    } catch (IOException e) {\n"
-          + "      e.printStackTrace();\n"
-          + "    }\n"
-          + "  }\n"
-          + "\n"
-          + "  /**\n"
-          + "   * Add books to Shelf and check if there is a novel, return string message as"
-          + " whether novel books\n"
-          + "   * are added to the shelf.\n"
-          + "   *\n"
-          + "   * @param shelf The Shelf object to which books will put.\n"
-          + "   * @param stack The Stack of the BookKinds.\n"
-          + "   */\n"
-          + "  public String addBooksContainsNovel(Shelf shelf, Stack<BookKind> stack) {\n"
-          + "    boolean containsNovel = false;\n"
-          + "    while (stack.isEmpty()) {\n"
-          + "      Book addedBook = addBookToShelf(stack.pop(), shelf);\n"
-          + "      if (addedBook instanceof Novel) {\n"
-          + "        containsNovel = true;\n"
-          + "      }\n"
-          + "    }\n"
-          + "    return containsNovel ? \"Added novels\" : \"No novels added\";\n"
-          + "  }\n"
-          + "\n"
-          + "  // Private helper.\n"
-          + "  private Book addBookToShelf(BookKind bookKind, Shelf shelf) {\n"
-          + "    Book book =\n"
-          + "        new Book() {\n"
-          + "          @Override\n"
-          + "          public void createBook(int seriesNum, BookKind bookKind) {\n"
-          + "            this.seriesNum = seriesNum;\n"
-          + "            this.bookKind = bookKind;\n"
-          + "          }\n"
-          + "        };\n"
-          + "    return book;\n"
-          + "  }\n"
-          + "\n"
-          + "  public class Shelf {\n"
-          + "    public String shelfName;\n"
-          + "    public int seriesNum;\n"
-          + "    public String shelfServiceName = serviceName;\n"
-          + "\n"
-          + "    public Shelf(String shelfName, int seriesNum) {\n"
-          + "      this.shelfName = shelfName;\n"
-          + "      this.seriesNum = seriesNum;\n"
-          + "    }\n"
-          + "  }\n"
-          + "\n"
-          + "  // Test nested abstract class and abstract method.\n"
-          + "  public abstract class Book {\n"
-          + "    public BookKind bookKind;\n"
-          + "    public int seriesNum;\n"
-          + "\n"
-          + "    public abstract void createBook(int seriesNum, BookKind bookKind);\n"
-          + "  }\n"
-          + "\n"
-          + "  public class Novel extends Book {\n"
-          + "\n"
-          + "    @Override\n"
-          + "    public void createBook(int seriesNum, BookKind bookKind) {\n"
-          + "      this.seriesNum = seriesNum;\n"
-          + "      this.bookKind = BookKind.NOVEL;\n"
-          + "    }\n"
-          + "  }\n"
-          + "}\n";
 }
diff --git a/src/test/java/com/google/api/generator/engine/goldens/BUILD.bazel b/src/test/java/com/google/api/generator/engine/goldens/BUILD.bazel
new file mode 100644
index 0000000000..85ac1a519e
--- /dev/null
+++ b/src/test/java/com/google/api/generator/engine/goldens/BUILD.bazel
@@ -0,0 +1,6 @@
+package(default_visibility = ["//visibility:public"])
+
+filegroup(
+    name = "goldens_files",
+    srcs = glob(["*.golden"]),
+)
diff --git a/src/test/java/com/google/api/generator/engine/goldens/JavaCodeGeneratorTest.golden b/src/test/java/com/google/api/generator/engine/goldens/JavaCodeGeneratorTest.golden
new file mode 100644
index 0000000000..c6fb279b8f
--- /dev/null
+++ b/src/test/java/com/google/api/generator/engine/goldens/JavaCodeGeneratorTest.golden
@@ -0,0 +1,149 @@
+/*
+ * Copyright 2020 Gagpic-generator-java
+ *
+ * Licensed description and license version 2.0 (the "License");
+ *
+ *    https://www.foo.bar/licenses/LICENSE-2.0
+ *
+ * Software distributed under the License is distributed on an "AS IS" BASIS.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.example.library.core;
+
+import com.google.exmaple.library.LibraryService;
+import com.google.exmaple.library.core.LibraryServiceStub;
+import com.google.exmaple.library.v1.BookKind;
+import com.google.gax.grpc.Stub;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Stack;
+
+/**
+ * Service Description: This is a test comment.
+ *
+ * <pre><code>
+ * LibraryServiceStub libServiceStub = new LibraryServiceStub()
+ * </code></pre>
+ *
+ * <ol>
+ *   <li>A "flattened" method.
+ *   <li>A "request object" method.
+ *   <li>A "callable" method.
+ * </ol>
+ *
+ * @deprecated This is a deprecated message.
+ */
+@SuppressWarnings("all")
+@Deprecated
+@Override
+public class LibraryServiceStub extends Stub implements LibraryService {
+  private static final String serviceName = "LibraryServiceStub";
+  protected List<Shelf> shelfList;
+  public static HashMap<String, Shelf> shelfMap;
+
+  public LibraryServiceStub() {
+    super();
+    this.shelfList = new ArrayList<>();
+    shelfMap = new HashMap<>();
+  }
+
+  @Override
+  public String addShelf(String name, double seriesDoubleNum) {
+    int seriesNum = ((int) seriesDoubleNum);
+    if (condition) {
+      return "Series number equals to max int value.";
+    }
+    shelfList.add(new Shelf(name, seriesNum));
+    if (shelfMap.containsKey(name)) {
+      return "Shelf is already existing in the map.";
+    }
+    shelfMap.put(name, new Shelf(name, seriesNum));
+    return "Shelf added.";
+  }
+
+  public void updateShelfMap(Shelf newShelf) throws Exception {
+    if (shelfMap.containsKey(newShelf.shelfName)) {
+      shelfMap.put(newShelf.shelfName, newShelf);
+    } else {
+      throw new Exception("Updating shelf is not existing in the map");
+    }
+  }
+
+  public void printShelfListToFile(String fileName) {
+    StringBuilder sb = new StringBuilder();
+    try {
+      FileWriter fileWriter = new FileWriter(fileName);
+      for (Shelf s : shelfList) {
+        sb.append(s.shelfName).append(s.seriesNum);
+      }
+      fileName.write(sb.toString());
+      fileName.close();
+    } catch (IOException e) {
+      e.printStackTrace();
+    }
+  }
+
+  /**
+   * Add books to Shelf and check if there is a novel, return string message as whether novel books
+   * are added to the shelf.
+   *
+   * @param shelf The Shelf object to which books will put.
+   * @param stack The Stack of the BookKinds.
+   */
+  public String addBooksContainsNovel(Shelf shelf, Stack<BookKind> stack) {
+    boolean containsNovel = false;
+    while (stack.isEmpty()) {
+      Book addedBook = addBookToShelf(stack.pop(), shelf);
+      if (addedBook instanceof Novel) {
+        containsNovel = true;
+      }
+    }
+    return containsNovel ? "Added novels" : "No novels added";
+  }
+
+  // Private helper.
+  private Book addBookToShelf(BookKind bookKind, Shelf shelf) {
+    Book book =
+        new Book() {
+          @Override
+          public void createBook(int seriesNum, BookKind bookKind) {
+            this.seriesNum = seriesNum;
+            this.bookKind = bookKind;
+          }
+        };
+    return book;
+  }
+
+  public class Shelf {
+    public String shelfName;
+    public int seriesNum;
+    public String shelfServiceName = serviceName;
+
+    public Shelf(String shelfName, int seriesNum) {
+      this.shelfName = shelfName;
+      this.seriesNum = seriesNum;
+    }
+  }
+
+  // Test nested abstract class and abstract method.
+  public abstract class Book {
+    public BookKind bookKind;
+    public int seriesNum;
+
+    public abstract void createBook(int seriesNum, BookKind bookKind);
+  }
+
+  public class Novel extends Book {
+
+    @Override
+    public void createBook(int seriesNum, BookKind bookKind) {
+      this.seriesNum = seriesNum;
+      this.bookKind = BookKind.NOVEL;
+    }
+  }
+}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/BUILD.bazel b/src/test/java/com/google/api/generator/gapic/composer/BUILD.bazel
index 169ed8837b..1e86c323b6 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/BUILD.bazel
+++ b/src/test/java/com/google/api/generator/gapic/composer/BUILD.bazel
@@ -20,7 +20,7 @@ TESTS = [
 
 filegroup(
     name = "composer_files",
-    srcs = ["{0}.java".format(f) for f in TESTS],
+    srcs = glob(["*.java"]),
 )
 
 java_proto_library(
@@ -39,8 +39,12 @@ java_proto_library(
 
 [java_test(
     name = test_name,
-    srcs = ["{0}.java".format(test_name)],
+    srcs = [
+        "{0}.java".format(test_name), 
+        "ComposerConstants.java",
+    ],
     data = [
+        "//src/test/java/com/google/api/generator/gapic/composer/goldens:goldens_files",
         "//src/test/java/com/google/api/generator/gapic/testdata:gapic_config_files",
         "//src/test/java/com/google/api/generator/gapic/testdata:service_config_files",
     ],
@@ -51,6 +55,7 @@ java_proto_library(
         "//src/main/java/com/google/api/generator/engine/ast",
         "//src/main/java/com/google/api/generator/engine/writer",
         "//src/main/java/com/google/api/generator/gapic/composer",
+        "//src/test/java/com/google/api/generator/test/framework",
         "//src/main/java/com/google/api/generator/gapic/model",
         "//src/main/java/com/google/api/generator/gapic/protoparser",
         "//src/test/java/com/google/api/generator/gapic/testdata:showcase_java_proto",
diff --git a/src/test/java/com/google/api/generator/gapic/composer/BatchingDescriptorComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/BatchingDescriptorComposerTest.java
index ffb494d802..a556b191f0 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/BatchingDescriptorComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/BatchingDescriptorComposerTest.java
@@ -28,6 +28,7 @@
 import com.google.api.generator.gapic.protoparser.BatchingSettingsConfigParser;
 import com.google.api.generator.gapic.protoparser.Parser;
 import com.google.api.generator.gapic.protoparser.ServiceConfigParser;
+import com.google.api.generator.test.framework.Assert;
 import com.google.logging.v2.LogEntryProto;
 import com.google.logging.v2.LoggingConfigProto;
 import com.google.logging.v2.LoggingMetricsProto;
@@ -49,9 +50,6 @@
 import org.junit.Test;
 
 public class BatchingDescriptorComposerTest {
-  private static final String TESTFILES_DIRECTORY =
-      "src/test/java/com/google/api/generator/gapic/testdata/";
-
   private JavaWriterVisitor writerVisitor;
 
   @Before
@@ -78,13 +76,13 @@ public void batchingDescriptor_hasSubresponseField() {
             serviceFileDescriptor, messageTypes, resourceNames, outputResourceNames);
 
     String filename = "pubsub_gapic.yaml";
-    Path path = Paths.get(TESTFILES_DIRECTORY, filename);
+    Path path = Paths.get(ComposerConstants.TESTFILES_DIRECTORY, filename);
     Optional<List<GapicBatchingSettings>> batchingSettingsOpt =
         BatchingSettingsConfigParser.parse(Optional.of(path.toString()));
     assertTrue(batchingSettingsOpt.isPresent());
 
     String jsonFilename = "pubsub_grpc_service_config.json";
-    Path jsonPath = Paths.get(TESTFILES_DIRECTORY, jsonFilename);
+    Path jsonPath = Paths.get(ComposerConstants.TESTFILES_DIRECTORY, jsonFilename);
     Optional<GapicServiceConfig> configOpt =
         ServiceConfigParser.parse(jsonPath.toString(), batchingSettingsOpt);
     assertTrue(configOpt.isPresent());
@@ -101,74 +99,11 @@ public void batchingDescriptor_hasSubresponseField() {
             method, batchingSetting, messageTypes);
 
     batchingDescriptorExpr.accept(writerVisitor);
-    String expected =
-        createLines(
-            "private static final BatchingDescriptor<PublishRequest, PublishResponse>"
-                + " PUBLISH_BATCHING_DESC = new BatchingDescriptor<PublishRequest,"
-                + " PublishResponse>() {\n",
-            "@Override\n",
-            "public PartitionKey getBatchPartitionKey(PublishRequest request) {\n",
-            "return new PartitionKey(request.getTopic());\n",
-            "}\n",
-            "\n",
-            "@Override\n",
-            "public RequestBuilder<PublishRequest> getRequestBuilder() {\n",
-            "return new RequestBuilder<PublishRequest>() {\n",
-            "private PublishRequest.Builder builder;\n",
-            "@Override\n",
-            "public void appendRequest(PublishRequest request) {\n",
-            "if (Objects.isNull(builder)) {\n",
-            "builder = request.toBuilder();\n",
-            "} else {\n",
-            "builder.addAllMessages(request.getMessagesList());\n",
-            "}\n",
-            "}\n",
-            "\n",
-            "@Override\n",
-            "public PublishRequest build() {\n",
-            "return builder.build();\n",
-            "}\n",
-            "\n",
-            "};\n",
-            "}\n",
-            "\n",
-            "@Override\n",
-            "public void splitResponse(PublishResponse batchResponse, Collection<? extends"
-                + " BatchedRequestIssuer<PublishResponse>> batch) {\n",
-            "int batchMessageIndex = 0;\n",
-            "for (BatchedRequestIssuer<PublishResponse> responder : batch) {\n",
-            "List<String> subresponseElements = new ArrayList<>();\n",
-            "long subresponseCount = responder.getMessageCount();\n",
-            "for (int i = 0; i < subresponseCount; i++) {\n",
-            "subresponseElements.add(batchResponse.getMessageIds(batchMessageIndex++));\n",
-            "}\n",
-            "PublishResponse response ="
-                + " PublishResponse.newBuilder().addAllMessageIds(subresponseElements).build();\n",
-            "responder.setResponse(response);\n",
-            "}\n",
-            "}\n",
-            "\n",
-            "@Override\n",
-            "public void splitException(Throwable throwable, Collection<? extends"
-                + " BatchedRequestIssuer<PublishResponse>> batch) {\n",
-            "for (BatchedRequestIssuer<PublishResponse> responder : batch) {\n",
-            "responder.setException(throwable);\n",
-            "}\n",
-            "}\n",
-            "\n",
-            "@Override\n",
-            "public long countElements(PublishRequest request) {\n",
-            "return request.getMessagesCount();\n",
-            "}\n",
-            "\n",
-            "@Override\n",
-            "public long countBytes(PublishRequest request) {\n",
-            "return request.getSerializedSize();\n",
-            "}\n",
-            "\n",
-            "}");
-
-    assertEquals(expected, writerVisitor.write());
+    Path goldenFilePath =
+        Paths.get(
+            ComposerConstants.GOLDENFILES_DIRECTORY,
+            "BatchingDescriptorComposerTestSubresponse.golden");
+    Assert.assertCodeEquals(goldenFilePath, writerVisitor.write());
   }
 
   @Test
@@ -197,13 +132,13 @@ public void batchingDescriptor_noSubresponseField() {
             serviceFileDescriptor, messageTypes, resourceNames, outputResourceNames);
 
     String filename = "logging_gapic.yaml";
-    Path path = Paths.get(TESTFILES_DIRECTORY, filename);
+    Path path = Paths.get(ComposerConstants.TESTFILES_DIRECTORY, filename);
     Optional<List<GapicBatchingSettings>> batchingSettingsOpt =
         BatchingSettingsConfigParser.parse(Optional.of(path.toString()));
     assertTrue(batchingSettingsOpt.isPresent());
 
     String jsonFilename = "logging_grpc_service_config.json";
-    Path jsonPath = Paths.get(TESTFILES_DIRECTORY, jsonFilename);
+    Path jsonPath = Paths.get(ComposerConstants.TESTFILES_DIRECTORY, jsonFilename);
     Optional<GapicServiceConfig> configOpt =
         ServiceConfigParser.parse(jsonPath.toString(), batchingSettingsOpt);
     assertTrue(configOpt.isPresent());
@@ -220,68 +155,11 @@ public void batchingDescriptor_noSubresponseField() {
             method, batchingSetting, messageTypes);
 
     batchingDescriptorExpr.accept(writerVisitor);
-    String expected =
-        createLines(
-            "private static final BatchingDescriptor<WriteLogEntriesRequest,"
-                + " WriteLogEntriesResponse> WRITE_LOG_ENTRIES_BATCHING_DESC = new"
-                + " BatchingDescriptor<WriteLogEntriesRequest, WriteLogEntriesResponse>() {\n",
-            "@Override\n",
-            "public PartitionKey getBatchPartitionKey(WriteLogEntriesRequest request) {\n",
-            "return new PartitionKey(request.getLogName(), request.getResource(),"
-                + " request.getLabels());\n",
-            "}\n",
-            "\n",
-            "@Override\n",
-            "public RequestBuilder<WriteLogEntriesRequest> getRequestBuilder() {\n",
-            "return new RequestBuilder<WriteLogEntriesRequest>() {\n",
-            "private WriteLogEntriesRequest.Builder builder;\n",
-            "@Override\n",
-            "public void appendRequest(WriteLogEntriesRequest request) {\n",
-            "if (Objects.isNull(builder)) {\n",
-            "builder = request.toBuilder();\n",
-            "} else {\n",
-            "builder.addAllEntries(request.getEntriesList());\n",
-            "}\n",
-            "}\n",
-            "\n",
-            "@Override\n",
-            "public WriteLogEntriesRequest build() {\n",
-            "return builder.build();\n",
-            "}\n",
-            "\n",
-            "};\n",
-            "}\n",
-            "\n",
-            "@Override\n",
-            "public void splitResponse(WriteLogEntriesResponse batchResponse, Collection<? extends"
-                + " BatchedRequestIssuer<WriteLogEntriesResponse>> batch) {\n",
-            "for (BatchedRequestIssuer<WriteLogEntriesResponse> responder : batch) {\n",
-            "WriteLogEntriesResponse response = WriteLogEntriesResponse.newBuilder().build();\n",
-            "responder.setResponse(response);\n",
-            "}\n",
-            "}\n",
-            "\n",
-            "@Override\n",
-            "public void splitException(Throwable throwable, Collection<? extends"
-                + " BatchedRequestIssuer<WriteLogEntriesResponse>> batch) {\n",
-            "for (BatchedRequestIssuer<WriteLogEntriesResponse> responder : batch) {\n",
-            "responder.setException(throwable);\n",
-            "}\n",
-            "}\n",
-            "\n",
-            "@Override\n",
-            "public long countElements(WriteLogEntriesRequest request) {\n",
-            "return request.getEntriesCount();\n",
-            "}\n",
-            "\n",
-            "@Override\n",
-            "public long countBytes(WriteLogEntriesRequest request) {\n",
-            "return request.getSerializedSize();\n",
-            "}\n",
-            "\n",
-            "}");
-
-    assertEquals(expected, writerVisitor.write());
+    Path goldenFilePath =
+        Paths.get(
+            ComposerConstants.GOLDENFILES_DIRECTORY,
+            "BatchingDescriptorComposerTestNoSubresponse.golden");
+    Assert.assertCodeEquals(goldenFilePath, writerVisitor.write());
   }
 
   private static Method findMethod(Service service, String methodName) {
diff --git a/src/test/java/com/google/api/generator/gapic/composer/ComposerConstants.java b/src/test/java/com/google/api/generator/gapic/composer/ComposerConstants.java
new file mode 100644
index 0000000000..97d3b6b23b
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/ComposerConstants.java
@@ -0,0 +1,22 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.api.generator.gapic.composer;
+
+public class ComposerConstants {
+  public static final String GOLDENFILES_DIRECTORY =
+      "src/test/java/com/google/api/generator/gapic/composer/goldens/";
+  public static final String TESTFILES_DIRECTORY =
+      "src/test/java/com/google/api/generator/gapic/testdata/";
+}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/ComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/ComposerTest.java
index e5102b3211..3f2980bede 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/ComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/ComposerTest.java
@@ -14,13 +14,14 @@
 
 package com.google.api.generator.gapic.composer;
 
-import static junit.framework.Assert.assertEquals;
-
 import com.google.api.generator.engine.ast.ClassDefinition;
 import com.google.api.generator.engine.ast.ScopeNode;
 import com.google.api.generator.engine.writer.JavaWriterVisitor;
 import com.google.api.generator.gapic.model.GapicClass;
 import com.google.api.generator.gapic.model.GapicClass.Kind;
+import com.google.api.generator.test.framework.Assert;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.Arrays;
 import java.util.List;
 import org.junit.Test;
@@ -38,25 +39,7 @@ public void gapicClass_addApacheLicense() {
         Composer.addApacheLicense(Arrays.asList(GapicClass.create(Kind.TEST, classDef)));
     JavaWriterVisitor visitor = new JavaWriterVisitor();
     gapicClassWithHeaderList.get(0).classDefinition().accept(visitor);
-    assertEquals(visitor.write(), EXPECTED_CLASS_STRING);
+    Path goldenFilePath = Paths.get(ComposerConstants.GOLDENFILES_DIRECTORY, "ComposerTest.golden");
+    Assert.assertCodeEquals(goldenFilePath, visitor.write());
   }
-
-  private static final String EXPECTED_CLASS_STRING =
-      "/*\n"
-          + " * Copyright 2020 Google LLC\n"
-          + " *\n"
-          + " * Licensed under the Apache License, Version 2.0 (the \"License\");\n"
-          + " * you may not use this file except in compliance with the License.\n"
-          + " * You may obtain a copy of the License at\n"
-          + " *\n"
-          + " *      https://www.apache.org/licenses/LICENSE-2.0\n"
-          + " *\n"
-          + " * Unless required by applicable law or agreed to in writing, software\n"
-          + " * distributed under the License is distributed on an \"AS IS\" BASIS,\n"
-          + " * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n"
-          + " * See the License for the specific language governing permissions and\n"
-          + " * limitations under the License.\n"
-          + " */\n\n"
-          + "package com.google.showcase.v1beta1.stub;\n\n"
-          + "public class EchoStubSettings {}\n";
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/GrpcServiceCallableFactoryClassComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/GrpcServiceCallableFactoryClassComposerTest.java
index 33bb12caad..32414a301b 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/GrpcServiceCallableFactoryClassComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/GrpcServiceCallableFactoryClassComposerTest.java
@@ -22,9 +22,12 @@
 import com.google.api.generator.gapic.model.ResourceName;
 import com.google.api.generator.gapic.model.Service;
 import com.google.api.generator.gapic.protoparser.Parser;
+import com.google.api.generator.test.framework.Assert;
 import com.google.protobuf.Descriptors.FileDescriptor;
 import com.google.protobuf.Descriptors.ServiceDescriptor;
 import com.google.showcase.v1beta1.EchoOuterClass;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
@@ -57,110 +60,8 @@ public void generateServiceClasses() {
 
     JavaWriterVisitor visitor = new JavaWriterVisitor();
     clazz.classDefinition().accept(visitor);
-    assertEquals(EXPECTED_CLASS_STRING, visitor.write());
+    Path goldenFilePath =
+        Paths.get(ComposerConstants.GOLDENFILES_DIRECTORY, "GrpcEchoCallableFactory.golden");
+    Assert.assertCodeEquals(goldenFilePath, visitor.write());
   }
-
-  // TODO(miraleung): Update this when a file-diffing test mechanism is in place.
-  private static final String EXPECTED_CLASS_STRING =
-      "package com.google.showcase.v1beta1.stub;\n"
-          + "\n"
-          + "import com.google.api.gax.grpc.GrpcCallSettings;\n"
-          + "import com.google.api.gax.grpc.GrpcCallableFactory;\n"
-          + "import com.google.api.gax.grpc.GrpcStubCallableFactory;\n"
-          + "import com.google.api.gax.rpc.BatchingCallSettings;\n"
-          + "import com.google.api.gax.rpc.BidiStreamingCallable;\n"
-          + "import com.google.api.gax.rpc.ClientContext;\n"
-          + "import com.google.api.gax.rpc.ClientStreamingCallable;\n"
-          + "import com.google.api.gax.rpc.OperationCallSettings;\n"
-          + "import com.google.api.gax.rpc.OperationCallable;\n"
-          + "import com.google.api.gax.rpc.PagedCallSettings;\n"
-          + "import com.google.api.gax.rpc.ServerStreamingCallSettings;\n"
-          + "import com.google.api.gax.rpc.ServerStreamingCallable;\n"
-          + "import com.google.api.gax.rpc.StreamingCallSettings;\n"
-          + "import com.google.api.gax.rpc.UnaryCallSettings;\n"
-          + "import com.google.api.gax.rpc.UnaryCallable;\n"
-          + "import com.google.longrunning.Operation;\n"
-          + "import com.google.longrunning.stub.OperationsStub;\n"
-          + "import javax.annotation.Generated;\n"
-          + "\n"
-          + "// AUTO-GENERATED DOCUMENTATION AND CLASS.\n"
-          + "/**\n"
-          + " * gRPC callable factory implementation for the Echo service API.\n"
-          + " *\n"
-          + " * <p>This class is for advanced usage.\n"
-          + " */\n"
-          + "@Generated(\"by gapic-generator\")\n"
-          + "public class GrpcEchoCallableFactory implements GrpcStubCallableFactory {\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public <RequestT, ResponseT> UnaryCallable<RequestT, ResponseT>"
-          + " createUnaryCallable(\n"
-          + "      GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,\n"
-          + "      UnaryCallSettings<RequestT, ResponseT> callSettings,\n"
-          + "      ClientContext clientContext) {\n"
-          + "    return GrpcCallableFactory.createUnaryCallable(grpcCallSettings, callSettings,"
-          + " clientContext);\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public <RequestT, ResponseT, PagedListResponseT>\n"
-          + "      UnaryCallable<RequestT, PagedListResponseT> createPagedCallable(\n"
-          + "          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,\n"
-          + "          PagedCallSettings<RequestT, ResponseT, PagedListResponseT> callSettings,\n"
-          + "          ClientContext clientContext) {\n"
-          + "    return GrpcCallableFactory.createPagedCallable(grpcCallSettings, callSettings,"
-          + " clientContext);\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public <RequestT, ResponseT> UnaryCallable<RequestT, ResponseT>"
-          + " createBatchingCallable(\n"
-          + "      GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,\n"
-          + "      BatchingCallSettings<RequestT, ResponseT> callSettings,\n"
-          + "      ClientContext clientContext) {\n"
-          + "    return GrpcCallableFactory.createBatchingCallable(\n"
-          + "        grpcCallSettings, callSettings, clientContext);\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public <RequestT, ResponseT, MetadataT>\n"
-          + "      OperationCallable<RequestT, ResponseT, MetadataT> createOperationCallable(\n"
-          + "          GrpcCallSettings<RequestT, Operation> grpcCallSettings,\n"
-          + "          OperationCallSettings<RequestT, ResponseT, MetadataT> callSettings,\n"
-          + "          ClientContext clientContext,\n"
-          + "          OperationsStub operationsStub) {\n"
-          + "    return GrpcCallableFactory.createOperationCallable(\n"
-          + "        grpcCallSettings, callSettings, clientContext, operationsStub);\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public <RequestT, ResponseT>\n"
-          + "      BidiStreamingCallable<RequestT, ResponseT> createBidiStreamingCallable(\n"
-          + "          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,\n"
-          + "          StreamingCallSettings<RequestT, ResponseT> callSettings,\n"
-          + "          ClientContext clientContext) {\n"
-          + "    return GrpcCallableFactory.createBidiStreamingCallable(\n"
-          + "        grpcCallSettings, callSettings, clientContext);\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public <RequestT, ResponseT>\n"
-          + "      ServerStreamingCallable<RequestT, ResponseT> createServerStreamingCallable(\n"
-          + "          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,\n"
-          + "          ServerStreamingCallSettings<RequestT, ResponseT> callSettings,\n"
-          + "          ClientContext clientContext) {\n"
-          + "    return GrpcCallableFactory.createServerStreamingCallable(\n"
-          + "        grpcCallSettings, callSettings, clientContext);\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public <RequestT, ResponseT>\n"
-          + "      ClientStreamingCallable<RequestT, ResponseT> createClientStreamingCallable(\n"
-          + "          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,\n"
-          + "          StreamingCallSettings<RequestT, ResponseT> callSettings,\n"
-          + "          ClientContext clientContext) {\n"
-          + "    return GrpcCallableFactory.createClientStreamingCallable(\n"
-          + "        grpcCallSettings, callSettings, clientContext);\n"
-          + "  }\n"
-          + "}\n";
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/GrpcServiceStubClassComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/GrpcServiceStubClassComposerTest.java
index 7aa005b7f4..53ea2c413e 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/GrpcServiceStubClassComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/GrpcServiceStubClassComposerTest.java
@@ -22,9 +22,12 @@
 import com.google.api.generator.gapic.model.ResourceName;
 import com.google.api.generator.gapic.model.Service;
 import com.google.api.generator.gapic.protoparser.Parser;
+import com.google.api.generator.test.framework.Assert;
 import com.google.protobuf.Descriptors.FileDescriptor;
 import com.google.protobuf.Descriptors.ServiceDescriptor;
 import com.google.showcase.v1beta1.EchoOuterClass;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
@@ -56,326 +59,7 @@ public void generateServiceClasses() {
 
     JavaWriterVisitor visitor = new JavaWriterVisitor();
     clazz.classDefinition().accept(visitor);
-    assertEquals(EXPECTED_CLASS_STRING, visitor.write());
+    Path goldenFilePath = Paths.get(ComposerConstants.GOLDENFILES_DIRECTORY, "GrpcEchoStub.golden");
+    Assert.assertCodeEquals(goldenFilePath, visitor.write());
   }
-
-  // TODO(miraleung): Update this when a file-diffing test mechanism is in place.
-  private static final String EXPECTED_CLASS_STRING =
-      "package com.google.showcase.v1beta1.stub;\n"
-          + "\n"
-          + "import static com.google.showcase.v1beta1.EchoClient.PagedExpandPagedResponse;\n"
-          + "\n"
-          + "import com.google.api.gax.core.BackgroundResource;\n"
-          + "import com.google.api.gax.core.BackgroundResourceAggregation;\n"
-          + "import com.google.api.gax.grpc.GrpcCallSettings;\n"
-          + "import com.google.api.gax.grpc.GrpcStubCallableFactory;\n"
-          + "import com.google.api.gax.rpc.BidiStreamingCallable;\n"
-          + "import com.google.api.gax.rpc.ClientContext;\n"
-          + "import com.google.api.gax.rpc.ClientStreamingCallable;\n"
-          + "import com.google.api.gax.rpc.OperationCallable;\n"
-          + "import com.google.api.gax.rpc.ServerStreamingCallable;\n"
-          + "import com.google.api.gax.rpc.UnaryCallable;\n"
-          + "import com.google.longrunning.Operation;\n"
-          + "import com.google.longrunning.stub.GrpcOperationsStub;\n"
-          + "import com.google.showcase.v1beta1.BlockRequest;\n"
-          + "import com.google.showcase.v1beta1.BlockResponse;\n"
-          + "import com.google.showcase.v1beta1.EchoRequest;\n"
-          + "import com.google.showcase.v1beta1.EchoResponse;\n"
-          + "import com.google.showcase.v1beta1.ExpandRequest;\n"
-          + "import com.google.showcase.v1beta1.PagedExpandRequest;\n"
-          + "import com.google.showcase.v1beta1.PagedExpandResponse;\n"
-          + "import com.google.showcase.v1beta1.WaitMetadata;\n"
-          + "import com.google.showcase.v1beta1.WaitRequest;\n"
-          + "import com.google.showcase.v1beta1.WaitResponse;\n"
-          + "import io.grpc.MethodDescriptor;\n"
-          + "import io.grpc.protobuf.ProtoUtils;\n"
-          + "import java.io.IOException;\n"
-          + "import java.util.concurrent.TimeUnit;\n"
-          + "import javax.annotation.Generated;\n"
-          + "\n"
-          + "// AUTO-GENERATED DOCUMENTATION AND CLASS.\n"
-          + "/**\n"
-          + " * gRPC stub implementation for the Echo service API.\n"
-          + " *\n"
-          + " * <p>This class is for advanced usage and reflects the underlying API directly.\n"
-          + " */\n"
-          + "@Generated(\"by gapic-generator-java\")\n"
-          + "public class GrpcEchoStub extends EchoStub {\n"
-          + "  private static final MethodDescriptor<EchoRequest, EchoResponse>"
-          + " echoMethodDescriptor =\n"
-          + "      MethodDescriptor.<EchoRequest, EchoResponse>newBuilder()\n"
-          + "          .setType(MethodDescriptor.MethodType.UNARY)\n"
-          + "          .setFullMethodName(\"google.showcase.v1beta1.Echo/Echo\")\n"
-          + "         "
-          + " .setRequestMarshaller(ProtoUtils.marshaller(EchoRequest.getDefaultInstance()))\n"
-          + "         "
-          + " .setResponseMarshaller(ProtoUtils.marshaller(EchoResponse.getDefaultInstance()))\n"
-          + "          .build();\n"
-          + "  private static final MethodDescriptor<ExpandRequest, EchoResponse>"
-          + " expandMethodDescriptor =\n"
-          + "      MethodDescriptor.<ExpandRequest, EchoResponse>newBuilder()\n"
-          + "          .setType(MethodDescriptor.MethodType.SERVER_STREAMING)\n"
-          + "          .setFullMethodName(\"google.showcase.v1beta1.Echo/Expand\")\n"
-          + "         "
-          + " .setRequestMarshaller(ProtoUtils.marshaller(ExpandRequest.getDefaultInstance()))\n"
-          + "         "
-          + " .setResponseMarshaller(ProtoUtils.marshaller(EchoResponse.getDefaultInstance()))\n"
-          + "          .build();\n"
-          + "  private static final MethodDescriptor<EchoRequest, EchoResponse>"
-          + " collectMethodDescriptor =\n"
-          + "      MethodDescriptor.<EchoRequest, EchoResponse>newBuilder()\n"
-          + "          .setType(MethodDescriptor.MethodType.CLIENT_STREAMING)\n"
-          + "          .setFullMethodName(\"google.showcase.v1beta1.Echo/Collect\")\n"
-          + "         "
-          + " .setRequestMarshaller(ProtoUtils.marshaller(EchoRequest.getDefaultInstance()))\n"
-          + "         "
-          + " .setResponseMarshaller(ProtoUtils.marshaller(EchoResponse.getDefaultInstance()))\n"
-          + "          .build();\n"
-          + "  private static final MethodDescriptor<EchoRequest, EchoResponse>"
-          + " chatMethodDescriptor =\n"
-          + "      MethodDescriptor.<EchoRequest, EchoResponse>newBuilder()\n"
-          + "          .setType(MethodDescriptor.MethodType.BIDI_STREAMING)\n"
-          + "          .setFullMethodName(\"google.showcase.v1beta1.Echo/Chat\")\n"
-          + "         "
-          + " .setRequestMarshaller(ProtoUtils.marshaller(EchoRequest.getDefaultInstance()))\n"
-          + "         "
-          + " .setResponseMarshaller(ProtoUtils.marshaller(EchoResponse.getDefaultInstance()))\n"
-          + "          .build();\n"
-          + "  private static final MethodDescriptor<EchoRequest, EchoResponse>"
-          + " chatAgainMethodDescriptor =\n"
-          + "      MethodDescriptor.<EchoRequest, EchoResponse>newBuilder()\n"
-          + "          .setType(MethodDescriptor.MethodType.BIDI_STREAMING)\n"
-          + "          .setFullMethodName(\"google.showcase.v1beta1.Echo/ChatAgain\")\n"
-          + "         "
-          + " .setRequestMarshaller(ProtoUtils.marshaller(EchoRequest.getDefaultInstance()))\n"
-          + "         "
-          + " .setResponseMarshaller(ProtoUtils.marshaller(EchoResponse.getDefaultInstance()))\n"
-          + "          .build();\n"
-          + "  private static final MethodDescriptor<PagedExpandRequest, PagedExpandResponse>\n"
-          + "      pagedExpandMethodDescriptor =\n"
-          + "          MethodDescriptor.<PagedExpandRequest, PagedExpandResponse>newBuilder()\n"
-          + "              .setType(MethodDescriptor.MethodType.UNARY)\n"
-          + "              .setFullMethodName(\"google.showcase.v1beta1.Echo/PagedExpand\")\n"
-          + "             "
-          + " .setRequestMarshaller(ProtoUtils.marshaller(PagedExpandRequest.getDefaultInstance()))\n"
-          + "              .setResponseMarshaller(\n"
-          + "                  ProtoUtils.marshaller(PagedExpandResponse.getDefaultInstance()))\n"
-          + "              .build();\n"
-          + "  private static final MethodDescriptor<WaitRequest, Operation> waitMethodDescriptor"
-          + " =\n"
-          + "      MethodDescriptor.<WaitRequest, Operation>newBuilder()\n"
-          + "          .setType(MethodDescriptor.MethodType.UNARY)\n"
-          + "          .setFullMethodName(\"google.showcase.v1beta1.Echo/Wait\")\n"
-          + "         "
-          + " .setRequestMarshaller(ProtoUtils.marshaller(WaitRequest.getDefaultInstance()))\n"
-          + "         "
-          + " .setResponseMarshaller(ProtoUtils.marshaller(Operation.getDefaultInstance()))\n"
-          + "          .build();\n"
-          + "  private static final MethodDescriptor<BlockRequest, BlockResponse>"
-          + " blockMethodDescriptor =\n"
-          + "      MethodDescriptor.<BlockRequest, BlockResponse>newBuilder()\n"
-          + "          .setType(MethodDescriptor.MethodType.UNARY)\n"
-          + "          .setFullMethodName(\"google.showcase.v1beta1.Echo/Block\")\n"
-          + "         "
-          + " .setRequestMarshaller(ProtoUtils.marshaller(BlockRequest.getDefaultInstance()))\n"
-          + "         "
-          + " .setResponseMarshaller(ProtoUtils.marshaller(BlockResponse.getDefaultInstance()))\n"
-          + "          .build();\n"
-          + "  private final UnaryCallable<EchoRequest, EchoResponse> echoCallable;\n"
-          + "  private final ServerStreamingCallable<ExpandRequest, EchoResponse>"
-          + " expandCallable;\n"
-          + "  private final ClientStreamingCallable<EchoRequest, EchoResponse> collectCallable;\n"
-          + "  private final BidiStreamingCallable<EchoRequest, EchoResponse> chatCallable;\n"
-          + "  private final BidiStreamingCallable<EchoRequest, EchoResponse> chatAgainCallable;\n"
-          + "  private final UnaryCallable<PagedExpandRequest, PagedExpandResponse>"
-          + " pagedExpandCallable;\n"
-          + "  private final UnaryCallable<PagedExpandRequest, PagedExpandPagedResponse>\n"
-          + "      pagedExpandPagedCallable;\n"
-          + "  private final UnaryCallable<WaitRequest, Operation> waitCallable;\n"
-          + "  private final OperationCallable<WaitRequest, WaitResponse, WaitMetadata>"
-          + " waitOperationCallable;\n"
-          + "  private final UnaryCallable<BlockRequest, BlockResponse> blockCallable;\n"
-          + "  private final BackgroundResource backgroundResources;\n"
-          + "  private final GrpcOperationsStub operationsStub;\n"
-          + "  private final GrpcStubCallableFactory callableFactory;\n"
-          + "\n"
-          + "  public static final GrpcEchoStub create(EchoStubSettings settings) throws"
-          + " IOException {\n"
-          + "    return new GrpcEchoStub(settings, ClientContext.create(settings));\n"
-          + "  }\n"
-          + "\n"
-          + "  public static final GrpcEchoStub create(ClientContext clientContext) throws"
-          + " IOException {\n"
-          + "    return new GrpcEchoStub(EchoStubSettings.newBuilder().build(), clientContext);\n"
-          + "  }\n"
-          + "\n"
-          + "  public static final GrpcEchoStub create(\n"
-          + "      ClientContext clientContext, GrpcStubCallableFactory callableFactory) throws"
-          + " IOException {\n"
-          + "    return new GrpcEchoStub(EchoStubSettings.newBuilder().build(), clientContext,"
-          + " callableFactory);\n"
-          + "  }\n"
-          + "\n"
-          + "  protected GrpcEchoStub(EchoStubSettings settings, ClientContext clientContext)\n"
-          + "      throws IOException {\n"
-          + "    this(settings, clientContext, new GrpcEchoCallableFactory());\n"
-          + "  }\n"
-          + "\n"
-          + "  protected GrpcEchoStub(\n"
-          + "      EchoStubSettings settings,\n"
-          + "      ClientContext clientContext,\n"
-          + "      GrpcStubCallableFactory callableFactory)\n"
-          + "      throws IOException {\n"
-          + "    this.callableFactory = callableFactory;\n"
-          + "    this.operationsStub = GrpcOperationsStub.create(clientContext,"
-          + " callableFactory);\n"
-          + "    GrpcCallSettings<EchoRequest, EchoResponse> echoTransportSettings =\n"
-          + "        GrpcCallSettings.<EchoRequest, EchoResponse>newBuilder()\n"
-          + "            .setMethodDescriptor(echoMethodDescriptor)\n"
-          + "            .build();\n"
-          + "    GrpcCallSettings<ExpandRequest, EchoResponse> expandTransportSettings =\n"
-          + "        GrpcCallSettings.<ExpandRequest, EchoResponse>newBuilder()\n"
-          + "            .setMethodDescriptor(expandMethodDescriptor)\n"
-          + "            .build();\n"
-          + "    GrpcCallSettings<EchoRequest, EchoResponse> collectTransportSettings =\n"
-          + "        GrpcCallSettings.<EchoRequest, EchoResponse>newBuilder()\n"
-          + "            .setMethodDescriptor(collectMethodDescriptor)\n"
-          + "            .build();\n"
-          + "    GrpcCallSettings<EchoRequest, EchoResponse> chatTransportSettings =\n"
-          + "        GrpcCallSettings.<EchoRequest, EchoResponse>newBuilder()\n"
-          + "            .setMethodDescriptor(chatMethodDescriptor)\n"
-          + "            .build();\n"
-          + "    GrpcCallSettings<EchoRequest, EchoResponse> chatAgainTransportSettings =\n"
-          + "        GrpcCallSettings.<EchoRequest, EchoResponse>newBuilder()\n"
-          + "            .setMethodDescriptor(chatAgainMethodDescriptor)\n"
-          + "            .build();\n"
-          + "    GrpcCallSettings<PagedExpandRequest, PagedExpandResponse>"
-          + " pagedExpandTransportSettings =\n"
-          + "        GrpcCallSettings.<PagedExpandRequest, PagedExpandResponse>newBuilder()\n"
-          + "            .setMethodDescriptor(pagedExpandMethodDescriptor)\n"
-          + "            .build();\n"
-          + "    GrpcCallSettings<WaitRequest, Operation> waitTransportSettings =\n"
-          + "        GrpcCallSettings.<WaitRequest, Operation>newBuilder()\n"
-          + "            .setMethodDescriptor(waitMethodDescriptor)\n"
-          + "            .build();\n"
-          + "    GrpcCallSettings<BlockRequest, BlockResponse> blockTransportSettings =\n"
-          + "        GrpcCallSettings.<BlockRequest, BlockResponse>newBuilder()\n"
-          + "            .setMethodDescriptor(blockMethodDescriptor)\n"
-          + "            .build();\n"
-          + "    this.echoCallable =\n"
-          + "        callableFactory.createUnaryCallable(\n"
-          + "            echoTransportSettings, settings.echoSettings(), clientContext);\n"
-          + "    this.expandCallable =\n"
-          + "        callableFactory.createServerStreamingCallable(\n"
-          + "            expandTransportSettings, settings.expandSettings(), clientContext);\n"
-          + "    this.collectCallable =\n"
-          + "        callableFactory.createClientStreamingCallable(\n"
-          + "            collectTransportSettings, settings.collectSettings(), clientContext);\n"
-          + "    this.chatCallable =\n"
-          + "        callableFactory.createBidiStreamingCallable(\n"
-          + "            chatTransportSettings, settings.chatSettings(), clientContext);\n"
-          + "    this.chatAgainCallable =\n"
-          + "        callableFactory.createBidiStreamingCallable(\n"
-          + "            chatAgainTransportSettings, settings.chatAgainSettings(),"
-          + " clientContext);\n"
-          + "    this.pagedExpandCallable =\n"
-          + "        callableFactory.createUnaryCallable(\n"
-          + "            pagedExpandTransportSettings, settings.pagedExpandSettings(),"
-          + " clientContext);\n"
-          + "    this.pagedExpandPagedCallable =\n"
-          + "        callableFactory.createPagedCallable(\n"
-          + "            pagedExpandTransportSettings, settings.pagedExpandSettings(),"
-          + " clientContext);\n"
-          + "    this.waitCallable =\n"
-          + "        callableFactory.createUnaryCallable(\n"
-          + "            waitTransportSettings, settings.waitSettings(), clientContext);\n"
-          + "    this.waitOperationCallable =\n"
-          + "        callableFactory.createOperationCallable(\n"
-          + "            waitTransportSettings, settings.waitOperationSettings(), clientContext,"
-          + " operationsStub);\n"
-          + "    this.blockCallable =\n"
-          + "        callableFactory.createUnaryCallable(\n"
-          + "            blockTransportSettings, settings.blockSettings(), clientContext);\n"
-          + "    this.backgroundResources =\n"
-          + "        new BackgroundResourceAggregation(clientContext.getBackgroundResources());\n"
-          + "  }\n"
-          + "\n"
-          + "  public GrpcOperationsStub getOperationsStub() {\n"
-          + "    return operationsStub;\n"
-          + "  }\n"
-          + "\n"
-          + "  public UnaryCallable<EchoRequest, EchoResponse> echoCallable() {\n"
-          + "    return echoCallable;\n"
-          + "  }\n"
-          + "\n"
-          + "  public ServerStreamingCallable<ExpandRequest, EchoResponse> expandCallable() {\n"
-          + "    return expandCallable;\n"
-          + "  }\n"
-          + "\n"
-          + "  public ClientStreamingCallable<EchoRequest, EchoResponse> collectCallable() {\n"
-          + "    return collectCallable;\n"
-          + "  }\n"
-          + "\n"
-          + "  public BidiStreamingCallable<EchoRequest, EchoResponse> chatCallable() {\n"
-          + "    return chatCallable;\n"
-          + "  }\n"
-          + "\n"
-          + "  public BidiStreamingCallable<EchoRequest, EchoResponse> chatAgainCallable() {\n"
-          + "    return chatAgainCallable;\n"
-          + "  }\n"
-          + "\n"
-          + "  public UnaryCallable<PagedExpandRequest, PagedExpandResponse> pagedExpandCallable()"
-          + " {\n"
-          + "    return pagedExpandCallable;\n"
-          + "  }\n"
-          + "\n"
-          + "  public UnaryCallable<PagedExpandRequest, PagedExpandPagedResponse>"
-          + " pagedExpandPagedCallable() {\n"
-          + "    return pagedExpandPagedCallable;\n"
-          + "  }\n"
-          + "\n"
-          + "  public UnaryCallable<WaitRequest, Operation> waitCallable() {\n"
-          + "    return waitCallable;\n"
-          + "  }\n"
-          + "\n"
-          + "  public OperationCallable<WaitRequest, WaitResponse, WaitMetadata>"
-          + " waitOperationCallable() {\n"
-          + "    return waitOperationCallable;\n"
-          + "  }\n"
-          + "\n"
-          + "  public UnaryCallable<BlockRequest, BlockResponse> blockCallable() {\n"
-          + "    return blockCallable;\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public final void close() {\n"
-          + "    shutdown();\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public void shutdown() {\n"
-          + "    backgroundResources.shutdown();\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public boolean isShutdown() {\n"
-          + "    return backgroundResources.isShutdown();\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public boolean isTerminated() {\n"
-          + "    return backgroundResources.isTerminated();\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public void shutdownNow() {\n"
-          + "    backgroundResources.shutdownNow();\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public boolean awaitTermination(long duration, TimeUnit unit) throws"
-          + " InterruptedException {\n"
-          + "    return backgroundResources.awaitTermination(duration, unit);\n"
-          + "  }\n"
-          + "}\n";
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/MockServiceClassComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/MockServiceClassComposerTest.java
index 7bcb5e48dd..5303ab557a 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/MockServiceClassComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/MockServiceClassComposerTest.java
@@ -22,9 +22,12 @@
 import com.google.api.generator.gapic.model.ResourceName;
 import com.google.api.generator.gapic.model.Service;
 import com.google.api.generator.gapic.protoparser.Parser;
+import com.google.api.generator.test.framework.Assert;
 import com.google.protobuf.Descriptors.FileDescriptor;
 import com.google.protobuf.Descriptors.ServiceDescriptor;
 import com.google.showcase.v1beta1.EchoOuterClass;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
@@ -56,52 +59,7 @@ public void generateServiceClasses() {
 
     JavaWriterVisitor visitor = new JavaWriterVisitor();
     clazz.classDefinition().accept(visitor);
-    assertEquals(EXPECTED_CLASS_STRING, visitor.write());
+    Path goldenFilePath = Paths.get(ComposerConstants.GOLDENFILES_DIRECTORY, "MockEcho.golden");
+    Assert.assertCodeEquals(goldenFilePath, visitor.write());
   }
-
-  // TODO(miraleung): Update this when a file-diffing test mechanism is in place.
-  private static final String EXPECTED_CLASS_STRING =
-      "package com.google.showcase.v1beta1;\n"
-          + "\n"
-          + "import com.google.api.core.BetaApi;\n"
-          + "import com.google.api.gax.grpc.testing.MockGrpcService;\n"
-          + "import com.google.protobuf.AbstractMessage;\n"
-          + "import io.grpc.ServerServiceDefinition;\n"
-          + "import java.util.List;\n"
-          + "import javax.annotation.Generated;\n"
-          + "\n"
-          + "@BetaApi\n"
-          + "@Generated(\"by gapic-generator-java\")\n"
-          + "public class MockEcho implements MockGrpcService {\n"
-          + "  private final MockEchoImpl serviceImpl;\n"
-          + "\n"
-          + "  public MockEcho() {\n"
-          + "    serviceImpl = new MockEchoImpl();\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public List<AbstractMessage> getRequests() {\n"
-          + "    return serviceImpl.getRequests();\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public void addResponse(AbstractMessage response) {\n"
-          + "    serviceImpl.addResponse(response);\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public void addException(Exception exception) {\n"
-          + "    serviceImpl.addException(exception);\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public ServerServiceDefinition getServiceDefinition() {\n"
-          + "    return serviceImpl.bindService();\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public void reset() {\n"
-          + "    serviceImpl.reset();\n"
-          + "  }\n"
-          + "}\n";
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/MockServiceImplClassComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/MockServiceImplClassComposerTest.java
index 6bdfa66035..cd2fb25b2e 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/MockServiceImplClassComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/MockServiceImplClassComposerTest.java
@@ -22,9 +22,12 @@
 import com.google.api.generator.gapic.model.ResourceName;
 import com.google.api.generator.gapic.model.Service;
 import com.google.api.generator.gapic.protoparser.Parser;
+import com.google.api.generator.test.framework.Assert;
 import com.google.protobuf.Descriptors.FileDescriptor;
 import com.google.protobuf.Descriptors.ServiceDescriptor;
 import com.google.showcase.v1beta1.EchoOuterClass;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
@@ -57,231 +60,7 @@ public void generateServiceClasses() {
 
     JavaWriterVisitor visitor = new JavaWriterVisitor();
     clazz.classDefinition().accept(visitor);
-    assertEquals(EXPECTED_CLASS_STRING, visitor.write());
+    Path goldenFilePath = Paths.get(ComposerConstants.GOLDENFILES_DIRECTORY, "MockEchoImpl.golden");
+    Assert.assertCodeEquals(goldenFilePath, visitor.write());
   }
-
-  // TODO(miraleung): Update this when a file-diffing test mechanism is in place.
-  private static final String EXPECTED_CLASS_STRING =
-      "package com.google.showcase.v1beta1;\n"
-          + "\n"
-          + "import com.google.api.core.BetaApi;\n"
-          + "import com.google.longrunning.Operation;\n"
-          + "import com.google.protobuf.AbstractMessage;\n"
-          + "import com.google.showcase.v1beta1.EchoGrpc.EchoImplBase;\n"
-          + "import io.grpc.stub.StreamObserver;\n"
-          + "import java.util.ArrayList;\n"
-          + "import java.util.LinkedList;\n"
-          + "import java.util.List;\n"
-          + "import java.util.Queue;\n"
-          + "import javax.annotation.Generated;\n"
-          + "\n"
-          + "@BetaApi\n"
-          + "@Generated(\"by gapic-generator-java\")\n"
-          + "public class MockEchoImpl extends EchoImplBase {\n"
-          + "  private List<AbstractMessage> requests;\n"
-          + "  private Queue<Object> responses;\n"
-          + "\n"
-          + "  public MockEchoImpl() {\n"
-          + "    requests = new ArrayList<>();\n"
-          + "    responses = new LinkedList<>();\n"
-          + "  }\n"
-          + "\n"
-          + "  public List<AbstractMessage> getRequests() {\n"
-          + "    return requests;\n"
-          + "  }\n"
-          + "\n"
-          + "  public void addResponse(AbstractMessage response) {\n"
-          + "    responses.add(response);\n"
-          + "  }\n"
-          + "\n"
-          + "  public void setResponses(List<AbstractMessage> responses) {\n"
-          + "    this.responses = new LinkedList<Object>(responses);\n"
-          + "  }\n"
-          + "\n"
-          + "  public void addException(Exception exception) {\n"
-          + "    responses.add(exception);\n"
-          + "  }\n"
-          + "\n"
-          + "  public void reset() {\n"
-          + "    requests = new ArrayList<>();\n"
-          + "    responses = new LinkedList<>();\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public void echo(EchoRequest request, StreamObserver<EchoResponse>"
-          + " responseObserver) {\n"
-          + "    Object response = responses.remove();\n"
-          + "    if (response instanceof EchoResponse) {\n"
-          + "      requests.add(request);\n"
-          + "      responseObserver.onNext(((EchoResponse) response));\n"
-          + "      responseObserver.onCompleted();\n"
-          + "    } else if (response instanceof Exception) {\n"
-          + "      responseObserver.onError(((Exception) response));\n"
-          + "    } else {\n"
-          + "      responseObserver.onError(new "
-          + "IllegalArgumentException(\"Unrecognized response type\"));\n"
-          + "    }\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public void expand(ExpandRequest request, StreamObserver<EchoResponse>"
-          + " responseObserver) {\n"
-          + "    Object response = responses.remove();\n"
-          + "    if (response instanceof EchoResponse) {\n"
-          + "      requests.add(request);\n"
-          + "      responseObserver.onNext(((EchoResponse) response));\n"
-          + "      responseObserver.onCompleted();\n"
-          + "    } else if (response instanceof Exception) {\n"
-          + "      responseObserver.onError(((Exception) response));\n"
-          + "    } else {\n"
-          + "      responseObserver.onError(new "
-          + "IllegalArgumentException(\"Unrecognized response type\"));\n"
-          + "    }\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public StreamObserver<EchoRequest> collect(final StreamObserver<EchoResponse>"
-          + " responseObserver) {\n"
-          + "    StreamObserver<EchoRequest> requestObserver =\n"
-          + "        new StreamObserver<EchoRequest>() {\n"
-          + "          @Override\n"
-          + "          public void onNext(EchoRequest value) {\n"
-          + "            requests.add(value);\n"
-          + "            final Object response = responses.remove();\n"
-          + "            if (response instanceof EchoResponse) {\n"
-          + "              responseObserver.onNext(((EchoResponse) response));\n"
-          + "            } else if (response instanceof Exception) {\n"
-          + "              responseObserver.onError(((Exception) response));\n"
-          + "            } else {\n"
-          + "              responseObserver.onError(new "
-          + "IllegalArgumentException(\"Unrecognized response type\"));\n"
-          + "            }\n"
-          + "          }\n"
-          + "\n"
-          + "          @Override\n"
-          + "          public void onError(Throwable t) {\n"
-          + "            responseObserver.onError(t);\n"
-          + "          }\n"
-          + "\n"
-          + "          @Override\n"
-          + "          public void onCompleted() {\n"
-          + "            responseObserver.onCompleted();\n"
-          + "          }\n"
-          + "        };\n"
-          + "    return requestObserver;\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public StreamObserver<EchoRequest> chat(final StreamObserver<EchoResponse>"
-          + " responseObserver) {\n"
-          + "    StreamObserver<EchoRequest> requestObserver =\n"
-          + "        new StreamObserver<EchoRequest>() {\n"
-          + "          @Override\n"
-          + "          public void onNext(EchoRequest value) {\n"
-          + "            requests.add(value);\n"
-          + "            final Object response = responses.remove();\n"
-          + "            if (response instanceof EchoResponse) {\n"
-          + "              responseObserver.onNext(((EchoResponse) response));\n"
-          + "            } else if (response instanceof Exception) {\n"
-          + "              responseObserver.onError(((Exception) response));\n"
-          + "            } else {\n"
-          + "              responseObserver.onError(new "
-          + "IllegalArgumentException(\"Unrecognized response type\"));\n"
-          + "            }\n"
-          + "          }\n"
-          + "\n"
-          + "          @Override\n"
-          + "          public void onError(Throwable t) {\n"
-          + "            responseObserver.onError(t);\n"
-          + "          }\n"
-          + "\n"
-          + "          @Override\n"
-          + "          public void onCompleted() {\n"
-          + "            responseObserver.onCompleted();\n"
-          + "          }\n"
-          + "        };\n"
-          + "    return requestObserver;\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public StreamObserver<EchoRequest> chatAgain(\n"
-          + "      final StreamObserver<EchoResponse> responseObserver) {\n"
-          + "    StreamObserver<EchoRequest> requestObserver =\n"
-          + "        new StreamObserver<EchoRequest>() {\n"
-          + "          @Override\n"
-          + "          public void onNext(EchoRequest value) {\n"
-          + "            requests.add(value);\n"
-          + "            final Object response = responses.remove();\n"
-          + "            if (response instanceof EchoResponse) {\n"
-          + "              responseObserver.onNext(((EchoResponse) response));\n"
-          + "            } else if (response instanceof Exception) {\n"
-          + "              responseObserver.onError(((Exception) response));\n"
-          + "            } else {\n"
-          + "              responseObserver.onError(new "
-          + "IllegalArgumentException(\"Unrecognized response type\"));\n"
-          + "            }\n"
-          + "          }\n"
-          + "\n"
-          + "          @Override\n"
-          + "          public void onError(Throwable t) {\n"
-          + "            responseObserver.onError(t);\n"
-          + "          }\n"
-          + "\n"
-          + "          @Override\n"
-          + "          public void onCompleted() {\n"
-          + "            responseObserver.onCompleted();\n"
-          + "          }\n"
-          + "        };\n"
-          + "    return requestObserver;\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public void pagedExpand(\n"
-          + "      PagedExpandRequest request, StreamObserver<PagedExpandResponse>"
-          + " responseObserver) {\n"
-          + "    Object response = responses.remove();\n"
-          + "    if (response instanceof PagedExpandResponse) {\n"
-          + "      requests.add(request);\n"
-          + "      responseObserver.onNext(((PagedExpandResponse) response));\n"
-          + "      responseObserver.onCompleted();\n"
-          + "    } else if (response instanceof Exception) {\n"
-          + "      responseObserver.onError(((Exception) response));\n"
-          + "    } else {\n"
-          + "      responseObserver.onError(new "
-          + "IllegalArgumentException(\"Unrecognized response type\"));\n"
-          + "    }\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public void wait(WaitRequest request, StreamObserver<Operation> responseObserver)"
-          + " {\n"
-          + "    Object response = responses.remove();\n"
-          + "    if (response instanceof Operation) {\n"
-          + "      requests.add(request);\n"
-          + "      responseObserver.onNext(((Operation) response));\n"
-          + "      responseObserver.onCompleted();\n"
-          + "    } else if (response instanceof Exception) {\n"
-          + "      responseObserver.onError(((Exception) response));\n"
-          + "    } else {\n"
-          + "      responseObserver.onError(new "
-          + "IllegalArgumentException(\"Unrecognized response type\"));\n"
-          + "    }\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public void block(BlockRequest request, StreamObserver<BlockResponse>"
-          + " responseObserver) {\n"
-          + "    Object response = responses.remove();\n"
-          + "    if (response instanceof BlockResponse) {\n"
-          + "      requests.add(request);\n"
-          + "      responseObserver.onNext(((BlockResponse) response));\n"
-          + "      responseObserver.onCompleted();\n"
-          + "    } else if (response instanceof Exception) {\n"
-          + "      responseObserver.onError(((Exception) response));\n"
-          + "    } else {\n"
-          + "      responseObserver.onError(new "
-          + "IllegalArgumentException(\"Unrecognized response type\"));\n"
-          + "    }\n"
-          + "  }\n"
-          + "}\n";
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/ResourceNameHelperClassComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/ResourceNameHelperClassComposerTest.java
index 48d00a10cf..1a8b3b954d 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/ResourceNameHelperClassComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/ResourceNameHelperClassComposerTest.java
@@ -23,10 +23,13 @@
 import com.google.api.generator.gapic.model.ResourceName;
 import com.google.api.generator.gapic.model.Service;
 import com.google.api.generator.gapic.protoparser.Parser;
+import com.google.api.generator.test.framework.Assert;
 import com.google.protobuf.Descriptors.FileDescriptor;
 import com.google.protobuf.Descriptors.ServiceDescriptor;
 import com.google.showcase.v1beta1.EchoOuterClass;
 import com.google.showcase.v1beta1.TestingOuterClass;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.Arrays;
 import java.util.HashSet;
 import java.util.List;
@@ -94,7 +97,8 @@ public void generateResourceNameClass_echoFoobarMultiplePatterns() {
 
     JavaWriterVisitor visitor = new JavaWriterVisitor();
     clazz.classDefinition().accept(visitor);
-    assertEquals(EXPECTED_FOOBAR_NAME_CLASS_STRING, visitor.write());
+    Path goldenFilePath = Paths.get(ComposerConstants.GOLDENFILES_DIRECTORY, "FoobarName.golden");
+    Assert.assertCodeEquals(goldenFilePath, visitor.write());
   }
 
   @Test
@@ -118,549 +122,8 @@ public void generateResourceNameClass_testingSessionOnePattern() {
 
     JavaWriterVisitor visitor = new JavaWriterVisitor();
     clazz.classDefinition().accept(visitor);
-    assertEquals(EXPECTED_SESSION_NAME_CLASS_STRING, visitor.write());
+    Path goldenFilePath = Paths.get(ComposerConstants.GOLDENFILES_DIRECTORY, "SessionName.golden");
+    Assert.assertCodeEquals(goldenFilePath, visitor.write());
   }
-
   // TODO(miraleung): Add more tests for a single pattern.
-  // TODO(miraleung): Update this when a file-diffing test mechanism is in place.
-  private static final String EXPECTED_FOOBAR_NAME_CLASS_STRING =
-      "package com.google.showcase.v1beta1;\n"
-          + "\n"
-          + "import com.google.api.core.BetaApi;\n"
-          + "import com.google.api.pathtemplate.PathTemplate;\n"
-          + "import com.google.api.pathtemplate.ValidationException;\n"
-          + "import com.google.api.resourcenames.ResourceName;\n"
-          + "import com.google.common.base.Preconditions;\n"
-          + "import com.google.common.collect.ImmutableMap;\n"
-          + "import java.util.ArrayList;\n"
-          + "import java.util.List;\n"
-          + "import java.util.Map;\n"
-          + "import java.util.Objects;\n"
-          + "import javax.annotation.Generated;\n"
-          + "\n"
-          + "// AUTO-GENERATED DOCUMENTATION AND CLASS.\n"
-          + "@Generated(\"by gapic-generator-java\")\n"
-          + "public class FoobarName implements ResourceName {\n"
-          + "  private static final PathTemplate PROJECT_FOOBAR =\n"
-          + "     "
-          + " PathTemplate.createWithoutUrlEncoding(\"projects/{project}/foobars/{foobar}\");\n"
-          + "  private static final PathTemplate PROJECT_VARIANT_FOOBAR =\n"
-          + "      PathTemplate.createWithoutUrlEncoding(\n"
-          + "          \"projects/{project}/chocolate/variants/{variant}/foobars/{foobar}\");\n"
-          + "  private static final PathTemplate FOOBAR =\n"
-          + "      PathTemplate.createWithoutUrlEncoding(\"foobars/{foobar}\");\n"
-          + "  private static final PathTemplate BAR_FOO_FOOBAR =\n"
-          + "     "
-          + " PathTemplate.createWithoutUrlEncoding(\"bar_foos/{bar_foo}/foobars/{foobar}\");\n"
-          + "  private volatile Map<String, String> fieldValuesMap;\n"
-          + "  private PathTemplate pathTemplate;\n"
-          + "  private String fixedValue;\n"
-          + "  private final String project;\n"
-          + "  private final String foobar;\n"
-          + "  private final String variant;\n"
-          + "  private final String barFoo;\n"
-          + "\n"
-          + "  private FoobarName(Builder builder) {\n"
-          + "    project = Preconditions.checkNotNull(builder.getProject());\n"
-          + "    foobar = Preconditions.checkNotNull(builder.getFoobar());\n"
-          + "    variant = null;\n"
-          + "    barFoo = null;\n"
-          + "    pathTemplate = PROJECT_FOOBAR;\n"
-          + "  }\n"
-          + "\n"
-          + "  private FoobarName(ProjectVariantFoobarBuilder builder) {\n"
-          + "    project = Preconditions.checkNotNull(builder.getProject());\n"
-          + "    variant = Preconditions.checkNotNull(builder.getVariant());\n"
-          + "    foobar = Preconditions.checkNotNull(builder.getFoobar());\n"
-          + "    barFoo = null;\n"
-          + "    pathTemplate = PROJECT_VARIANT_FOOBAR;\n"
-          + "  }\n"
-          + "\n"
-          + "  private FoobarName(FoobarBuilder builder) {\n"
-          + "    foobar = Preconditions.checkNotNull(builder.getFoobar());\n"
-          + "    project = null;\n"
-          + "    variant = null;\n"
-          + "    barFoo = null;\n"
-          + "    pathTemplate = FOOBAR;\n"
-          + "  }\n"
-          + "\n"
-          + "  private FoobarName(BarFooFoobarBuilder builder) {\n"
-          + "    barFoo = Preconditions.checkNotNull(builder.getBarFoo());\n"
-          + "    foobar = Preconditions.checkNotNull(builder.getFoobar());\n"
-          + "    project = null;\n"
-          + "    variant = null;\n"
-          + "    pathTemplate = BAR_FOO_FOOBAR;\n"
-          + "  }\n"
-          + "\n"
-          + "  public String getProject() {\n"
-          + "    return project;\n"
-          + "  }\n"
-          + "\n"
-          + "  public String getFoobar() {\n"
-          + "    return foobar;\n"
-          + "  }\n"
-          + "\n"
-          + "  public String getVariant() {\n"
-          + "    return variant;\n"
-          + "  }\n"
-          + "\n"
-          + "  public String getBarFoo() {\n"
-          + "    return barFoo;\n"
-          + "  }\n"
-          + "\n"
-          + "  public static Builder newBuilder() {\n"
-          + "    return new Builder();\n"
-          + "  }\n"
-          + "\n"
-          + "  @BetaApi(\"The per-pattern Builders are not stable yet and may be changed in the"
-          + " future.\")\n"
-          + "  public static Builder newProjectFoobarBuilder() {\n"
-          + "    return new Builder();\n"
-          + "  }\n"
-          + "\n"
-          + "  @BetaApi(\"The per-pattern Builders are not stable yet and may be changed in the"
-          + " future.\")\n"
-          + "  public static ProjectVariantFoobarBuilder newProjectVariantFoobarBuilder() {\n"
-          + "    return new ProjectVariantFoobarBuilder();\n"
-          + "  }\n"
-          + "\n"
-          + "  @BetaApi(\"The per-pattern Builders are not stable yet and may be changed in the"
-          + " future.\")\n"
-          + "  public static FoobarBuilder newFoobarBuilder() {\n"
-          + "    return new FoobarBuilder();\n"
-          + "  }\n"
-          + "\n"
-          + "  @BetaApi(\"The per-pattern Builders are not stable yet and may be changed in the"
-          + " future.\")\n"
-          + "  public static BarFooFoobarBuilder newBarFooFoobarBuilder() {\n"
-          + "    return new BarFooFoobarBuilder();\n"
-          + "  }\n"
-          + "\n"
-          + "  public Builder toBuilder() {\n"
-          + "    return new Builder(this);\n"
-          + "  }\n"
-          + "\n"
-          + "  public static FoobarName of(String project, String foobar) {\n"
-          + "    return newBuilder().setProject(project).setFoobar(foobar).build();\n"
-          + "  }\n"
-          + "\n"
-          + "  @BetaApi(\"The static create methods are not stable yet and may be changed in the"
-          + " future.\")\n"
-          + "  public static FoobarName ofProjectFoobarBuilder(String project, String foobar) {\n"
-          + "    return newBuilder().setProject(project).setFoobar(foobar).build();\n"
-          + "  }\n"
-          + "\n"
-          + "  @BetaApi(\"The static create methods are not stable yet and may be changed in the"
-          + " future.\")\n"
-          + "  public static FoobarName ofProjectVariantFoobarBuilder(\n"
-          + "      String project, String variant, String foobar) {\n"
-          + "    return newProjectVariantFoobarBuilder()\n"
-          + "        .setProject(project)\n"
-          + "        .setVariant(variant)\n"
-          + "        .setFoobar(foobar)\n"
-          + "        .build();\n"
-          + "  }\n"
-          + "\n"
-          + "  @BetaApi(\"The static create methods are not stable yet and may be changed in the"
-          + " future.\")\n"
-          + "  public static FoobarName ofFoobarBuilder(String foobar) {\n"
-          + "    return newFoobarBuilder().setFoobar(foobar).build();\n"
-          + "  }\n"
-          + "\n"
-          + "  @BetaApi(\"The static create methods are not stable yet and may be changed in the"
-          + " future.\")\n"
-          + "  public static FoobarName ofBarFooFoobarBuilder(String barFoo, String foobar) {\n"
-          + "    return newBarFooFoobarBuilder().setBarFoo(barFoo).setFoobar(foobar).build();\n"
-          + "  }\n"
-          + "\n"
-          + "  public static String format(String project, String foobar) {\n"
-          + "    return newBuilder().setProject(project).setFoobar(foobar).build().toString();\n"
-          + "  }\n"
-          + "\n"
-          + "  @BetaApi(\"The static format methods are not stable yet and may be changed in the"
-          + " future.\")\n"
-          + "  public static String formatProjectFoobarBuilder(String project, String foobar) {\n"
-          + "    return newBuilder().setProject(project).setFoobar(foobar).build().toString();\n"
-          + "  }\n"
-          + "\n"
-          + "  @BetaApi(\"The static format methods are not stable yet and may be changed in the"
-          + " future.\")\n"
-          + "  public static String formatProjectVariantFoobarBuilder(\n"
-          + "      String project, String variant, String foobar) {\n"
-          + "    return newProjectVariantFoobarBuilder()\n"
-          + "        .setProject(project)\n"
-          + "        .setVariant(variant)\n"
-          + "        .setFoobar(foobar)\n"
-          + "        .build()\n"
-          + "        .toString();\n"
-          + "  }\n"
-          + "\n"
-          + "  @BetaApi(\"The static format methods are not stable yet and may be changed in the"
-          + " future.\")\n"
-          + "  public static String formatFoobarBuilder(String foobar) {\n"
-          + "    return newFoobarBuilder().setFoobar(foobar).build().toString();\n"
-          + "  }\n"
-          + "\n"
-          + "  @BetaApi(\"The static format methods are not stable yet and may be changed in the"
-          + " future.\")\n"
-          + "  public static String formatBarFooFoobarBuilder(String barFoo, String foobar) {\n"
-          + "    return"
-          + " newBarFooFoobarBuilder().setBarFoo(barFoo).setFoobar(foobar).build().toString();\n"
-          + "  }\n"
-          + "\n"
-          + "  public static FoobarName parse(String formattedString) {\n"
-          + "    if (formattedString.isEmpty()) {\n"
-          + "      return null;\n"
-          + "    }\n"
-          + "    if (PROJECT_FOOBAR.matches(formattedString)) {\n"
-          + "      Map<String, String> matchMap = PROJECT_FOOBAR.match(formattedString);\n"
-          + "      return ofProjectFoobarBuilder(matchMap.get(\"project\"),"
-          + " matchMap.get(\"foobar\"));\n"
-          + "    } else if (PROJECT_VARIANT_FOOBAR.matches(formattedString)) {\n"
-          + "      Map<String, String> matchMap = PROJECT_VARIANT_FOOBAR.match(formattedString);\n"
-          + "      return ofProjectVariantFoobarBuilder(\n"
-          + "          matchMap.get(\"project\"), matchMap.get(\"variant\"),"
-          + " matchMap.get(\"foobar\"));\n"
-          + "    } else if (FOOBAR.matches(formattedString)) {\n"
-          + "      Map<String, String> matchMap = FOOBAR.match(formattedString);\n"
-          + "      return ofFoobarBuilder(matchMap.get(\"foobar\"));\n"
-          + "    } else if (BAR_FOO_FOOBAR.matches(formattedString)) {\n"
-          + "      Map<String, String> matchMap = BAR_FOO_FOOBAR.match(formattedString);\n"
-          + "      return ofBarFooFoobarBuilder(matchMap.get(\"bar_foo\"),"
-          + " matchMap.get(\"foobar\"));\n"
-          + "    }\n"
-          + "    throw new ValidationException(\"FoobarName.parse: formattedString not in valid"
-          + " format\");\n"
-          + "  }\n"
-          + "\n"
-          + "  public static List<FoobarName> parseList(List<String> formattedStrings) {\n"
-          + "    List<FoobarName> list = new ArrayList<>(formattedStrings.size());\n"
-          + "    for (String formattedString : formattedStrings) {\n"
-          + "      list.add(parse(formattedString));\n"
-          + "    }\n"
-          + "    return list;\n"
-          + "  }\n"
-          + "\n"
-          + "  public static List<String> toStringList(List<FoobarName> values) {\n"
-          + "    List<String> list = new ArrayList<>(values.size());\n"
-          + "    for (FoobarName value : values) {\n"
-          + "      if (Objects.isNull(value)) {\n"
-          + "        list.add(\"\");\n"
-          + "      } else {\n"
-          + "        list.add(value.toString());\n"
-          + "      }\n"
-          + "    }\n"
-          + "    return list;\n"
-          + "  }\n"
-          + "\n"
-          + "  public static boolean isParsableFrom(String formattedString) {\n"
-          + "    return PROJECT_FOOBAR.matches(formattedString)\n"
-          + "        || PROJECT_VARIANT_FOOBAR.matches(formattedString)\n"
-          + "        || FOOBAR.matches(formattedString)\n"
-          + "        || BAR_FOO_FOOBAR.matches(formattedString);\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public Map<String, String> getFieldValuesMap() {\n"
-          + "    if (Objects.isNull(fieldValuesMap)) {\n"
-          + "      synchronized (this) {\n"
-          + "        if (Objects.isNull(fieldValuesMap)) {\n"
-          + "          ImmutableMap.Builder<String, String> fieldMapBuilder ="
-          + " ImmutableMap.builder();\n"
-          + "          if (!Objects.isNull(project)) {\n"
-          + "            fieldMapBuilder.put(\"project\", project);\n"
-          + "          }\n"
-          + "          if (!Objects.isNull(foobar)) {\n"
-          + "            fieldMapBuilder.put(\"foobar\", foobar);\n"
-          + "          }\n"
-          + "          if (!Objects.isNull(variant)) {\n"
-          + "            fieldMapBuilder.put(\"variant\", variant);\n"
-          + "          }\n"
-          + "          if (!Objects.isNull(barFoo)) {\n"
-          + "            fieldMapBuilder.put(\"bar_foo\", barFoo);\n"
-          + "          }\n"
-          + "          fieldValuesMap = fieldMapBuilder.build();\n"
-          + "        }\n"
-          + "      }\n"
-          + "    }\n"
-          + "    return fieldValuesMap;\n"
-          + "  }\n"
-          + "\n"
-          + "  public String getFieldValue(String fieldName) {\n"
-          + "    return getFieldValuesMap().get(fieldName);\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public String toString() {\n"
-          + "    return !Objects.isNull(fixedValue) ? fixedValue :"
-          + " pathTemplate.instantiate(getFieldValuesMap());\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Builder for projects/{project}/foobars/{foobar}. */\n"
-          + "  public static class Builder {\n"
-          + "    private String project;\n"
-          + "    private String foobar;\n"
-          + "\n"
-          + "    private Builder() {}\n"
-          + "\n"
-          + "    public String getProject() {\n"
-          + "      return project;\n"
-          + "    }\n"
-          + "\n"
-          + "    public String getFoobar() {\n"
-          + "      return foobar;\n"
-          + "    }\n"
-          + "\n"
-          + "    public Builder setProject(String project) {\n"
-          + "      this.project = project;\n"
-          + "      return this;\n"
-          + "    }\n"
-          + "\n"
-          + "    public Builder setFoobar(String foobar) {\n"
-          + "      this.foobar = foobar;\n"
-          + "      return this;\n"
-          + "    }\n"
-          + "\n"
-          + "    private Builder(FoobarName foobarName) {\n"
-          + "      Preconditions.checkArgument(\n"
-          + "          Objects.equals(foobarName.pathTemplate, PROJECT_FOOBAR),\n"
-          + "          \"toBuilder is only supported when FoobarName has the pattern of"
-          + " projects/{project}/foobars/{foobar}\");\n"
-          + "      project = foobarName.project;\n"
-          + "      foobar = foobarName.foobar;\n"
-          + "    }\n"
-          + "\n"
-          + "    public FoobarName build() {\n"
-          + "      return new FoobarName(this);\n"
-          + "    }\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Builder for projects/{project}/chocolate/variants/{variant}/foobars/{foobar}."
-          + " */\n"
-          + "  @BetaApi(\"The per-pattern Builders are not stable yet and may be changed in the"
-          + " future.\")\n"
-          + "  public static class ProjectVariantFoobarBuilder {\n"
-          + "    private String project;\n"
-          + "    private String variant;\n"
-          + "    private String foobar;\n"
-          + "\n"
-          + "    private ProjectVariantFoobarBuilder() {}\n"
-          + "\n"
-          + "    public String getProject() {\n"
-          + "      return project;\n"
-          + "    }\n"
-          + "\n"
-          + "    public String getVariant() {\n"
-          + "      return variant;\n"
-          + "    }\n"
-          + "\n"
-          + "    public String getFoobar() {\n"
-          + "      return foobar;\n"
-          + "    }\n"
-          + "\n"
-          + "    public ProjectVariantFoobarBuilder setProject(String project) {\n"
-          + "      this.project = project;\n"
-          + "      return this;\n"
-          + "    }\n"
-          + "\n"
-          + "    public ProjectVariantFoobarBuilder setVariant(String variant) {\n"
-          + "      this.variant = variant;\n"
-          + "      return this;\n"
-          + "    }\n"
-          + "\n"
-          + "    public ProjectVariantFoobarBuilder setFoobar(String foobar) {\n"
-          + "      this.foobar = foobar;\n"
-          + "      return this;\n"
-          + "    }\n"
-          + "\n"
-          + "    public FoobarName build() {\n"
-          + "      return new FoobarName(this);\n"
-          + "    }\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Builder for foobars/{foobar}. */\n"
-          + "  @BetaApi(\"The per-pattern Builders are not stable yet and may be changed in the"
-          + " future.\")\n"
-          + "  public static class FoobarBuilder {\n"
-          + "    private String foobar;\n"
-          + "\n"
-          + "    private FoobarBuilder() {}\n"
-          + "\n"
-          + "    public String getFoobar() {\n"
-          + "      return foobar;\n"
-          + "    }\n"
-          + "\n"
-          + "    public FoobarBuilder setFoobar(String foobar) {\n"
-          + "      this.foobar = foobar;\n"
-          + "      return this;\n"
-          + "    }\n"
-          + "\n"
-          + "    public FoobarName build() {\n"
-          + "      return new FoobarName(this);\n"
-          + "    }\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Builder for bar_foos/{bar_foo}/foobars/{foobar}. */\n"
-          + "  @BetaApi(\"The per-pattern Builders are not stable yet and may be changed in the"
-          + " future.\")\n"
-          + "  public static class BarFooFoobarBuilder {\n"
-          + "    private String barFoo;\n"
-          + "    private String foobar;\n"
-          + "\n"
-          + "    private BarFooFoobarBuilder() {}\n"
-          + "\n"
-          + "    public String getBarFoo() {\n"
-          + "      return barFoo;\n"
-          + "    }\n"
-          + "\n"
-          + "    public String getFoobar() {\n"
-          + "      return foobar;\n"
-          + "    }\n"
-          + "\n"
-          + "    public BarFooFoobarBuilder setBarFoo(String barFoo) {\n"
-          + "      this.barFoo = barFoo;\n"
-          + "      return this;\n"
-          + "    }\n"
-          + "\n"
-          + "    public BarFooFoobarBuilder setFoobar(String foobar) {\n"
-          + "      this.foobar = foobar;\n"
-          + "      return this;\n"
-          + "    }\n"
-          + "\n"
-          + "    public FoobarName build() {\n"
-          + "      return new FoobarName(this);\n"
-          + "    }\n"
-          + "  }\n"
-          + "}\n";
-
-  private static final String EXPECTED_SESSION_NAME_CLASS_STRING =
-      "package com.google.showcase.v1beta1;\n"
-          + "\n"
-          + "import com.google.api.pathtemplate.PathTemplate;\n"
-          + "import com.google.api.resourcenames.ResourceName;\n"
-          + "import com.google.common.base.Preconditions;\n"
-          + "import com.google.common.collect.ImmutableMap;\n"
-          + "import java.util.ArrayList;\n"
-          + "import java.util.List;\n"
-          + "import java.util.Map;\n"
-          + "import java.util.Objects;\n"
-          + "import javax.annotation.Generated;\n"
-          + "\n"
-          + "// AUTO-GENERATED DOCUMENTATION AND CLASS.\n"
-          + "@Generated(\"by gapic-generator-java\")\n"
-          + "public class SessionName implements ResourceName {\n"
-          + "  private static final PathTemplate SESSION =\n"
-          + "      PathTemplate.createWithoutUrlEncoding(\"sessions/{session}\");\n"
-          + "  private volatile Map<String, String> fieldValuesMap;\n"
-          + "  private final String session;\n"
-          + "\n"
-          + "  private SessionName(Builder builder) {\n"
-          + "    session = Preconditions.checkNotNull(builder.getSession());\n"
-          + "  }\n"
-          + "\n"
-          + "  public String getSession() {\n"
-          + "    return session;\n"
-          + "  }\n"
-          + "\n"
-          + "  public static Builder newBuilder() {\n"
-          + "    return new Builder();\n"
-          + "  }\n"
-          + "\n"
-          + "  public Builder toBuilder() {\n"
-          + "    return new Builder(this);\n"
-          + "  }\n"
-          + "\n"
-          + "  public static SessionName of(String session) {\n"
-          + "    return newBuilder().setSession(session).build();\n"
-          + "  }\n"
-          + "\n"
-          + "  public static String format(String session) {\n"
-          + "    return newBuilder().setSession(session).build().toString();\n"
-          + "  }\n"
-          + "\n"
-          + "  public static SessionName parse(String formattedString) {\n"
-          + "    if (formattedString.isEmpty()) {\n"
-          + "      return null;\n"
-          + "    }\n"
-          + "    Map<String, String> matchMap =\n"
-          + "        SESSION.validatedMatch(\n"
-          + "            formattedString, \"SessionName.parse:"
-          + " formattedString not in valid format\");\n"
-          + "    return of(matchMap.get(\"session\"));\n"
-          + "  }\n"
-          + "\n"
-          + "  public static List<SessionName> parseList(List<String> formattedStrings) {\n"
-          + "    List<SessionName> list = new ArrayList<>(formattedStrings.size());\n"
-          + "    for (String formattedString : formattedStrings) {\n"
-          + "      list.add(parse(formattedString));\n"
-          + "    }\n"
-          + "    return list;\n"
-          + "  }\n"
-          + "\n"
-          + "  public static List<String> toStringList(List<SessionName> values) {\n"
-          + "    List<String> list = new ArrayList<>(values.size());\n"
-          + "    for (SessionName value : values) {\n"
-          + "      if (Objects.isNull(value)) {\n"
-          + "        list.add(\"\");\n"
-          + "      } else {\n"
-          + "        list.add(value.toString());\n"
-          + "      }\n"
-          + "    }\n"
-          + "    return list;\n"
-          + "  }\n"
-          + "\n"
-          + "  public static boolean isParsableFrom(String formattedString) {\n"
-          + "    return SESSION.matches(formattedString);\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public Map<String, String> getFieldValuesMap() {\n"
-          + "    if (Objects.isNull(fieldValuesMap)) {\n"
-          + "      synchronized (this) {\n"
-          + "        if (Objects.isNull(fieldValuesMap)) {\n"
-          + "          ImmutableMap.Builder<String, String> fieldMapBuilder ="
-          + " ImmutableMap.builder();\n"
-          + "          if (!Objects.isNull(session)) {\n"
-          + "            fieldMapBuilder.put(\"session\", session);\n"
-          + "          }\n"
-          + "          fieldValuesMap = fieldMapBuilder.build();\n"
-          + "        }\n"
-          + "      }\n"
-          + "    }\n"
-          + "    return fieldValuesMap;\n"
-          + "  }\n"
-          + "\n"
-          + "  public String getFieldValue(String fieldName) {\n"
-          + "    return getFieldValuesMap().get(fieldName);\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public String toString() {\n"
-          + "    return SESSION.instantiate(\"session\", session);\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Builder for sessions/{session}. */\n"
-          + "  public static class Builder {\n"
-          + "    private String session;\n"
-          + "\n"
-          + "    private Builder() {}\n"
-          + "\n"
-          + "    public String getSession() {\n"
-          + "      return session;\n"
-          + "    }\n"
-          + "\n"
-          + "    public Builder setSession(String session) {\n"
-          + "      this.session = session;\n"
-          + "      return this;\n"
-          + "    }\n"
-          + "\n"
-          + "    private Builder(SessionName sessionName) {\n"
-          + "      session = sessionName.session;\n"
-          + "    }\n"
-          + "\n"
-          + "    public SessionName build() {\n"
-          + "      return new SessionName(this);\n"
-          + "    }\n"
-          + "  }\n"
-          + "}\n";
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/RetrySettingsComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/RetrySettingsComposerTest.java
index 27eedd2d68..be764f7073 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/RetrySettingsComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/RetrySettingsComposerTest.java
@@ -61,8 +61,6 @@
 import org.junit.Test;
 
 public class RetrySettingsComposerTest {
-  private static final String TESTFILES_DIRECTORY =
-      "src/test/java/com/google/api/generator/gapic/testdata/";
   private static final VariableExpr RETRY_PARAM_DEFINITIONS_VAR_EXPR =
       createRetryParamDefinitionsVarExpr();
   private static final VariableExpr RETRY_CODES_DEFINITIONS_VAR_EXPR =
@@ -89,7 +87,7 @@ public void paramDefinitionsBlock_noConfigsFound() {
     Service service = services.get(0);
 
     String jsonFilename = "retrying_grpc_service_config.json";
-    Path jsonPath = Paths.get(TESTFILES_DIRECTORY, jsonFilename);
+    Path jsonPath = Paths.get(ComposerConstants.TESTFILES_DIRECTORY, jsonFilename);
     Optional<GapicServiceConfig> serviceConfigOpt =
         ServiceConfigParser.parse(jsonPath.toString(), Optional.empty());
     assertTrue(serviceConfigOpt.isPresent());
@@ -126,7 +124,7 @@ public void paramDefinitionsBlock_basic() {
     Service service = services.get(0);
 
     String jsonFilename = "showcase_grpc_service_config.json";
-    Path jsonPath = Paths.get(TESTFILES_DIRECTORY, jsonFilename);
+    Path jsonPath = Paths.get(ComposerConstants.TESTFILES_DIRECTORY, jsonFilename);
     Optional<GapicServiceConfig> serviceConfigOpt =
         ServiceConfigParser.parse(jsonPath.toString(), Optional.empty());
     assertTrue(serviceConfigOpt.isPresent());
@@ -167,7 +165,7 @@ public void codesDefinitionsBlock_noConfigsFound() {
     Service service = services.get(0);
 
     String jsonFilename = "retrying_grpc_service_config.json";
-    Path jsonPath = Paths.get(TESTFILES_DIRECTORY, jsonFilename);
+    Path jsonPath = Paths.get(ComposerConstants.TESTFILES_DIRECTORY, jsonFilename);
     Optional<GapicServiceConfig> serviceConfigOpt =
         ServiceConfigParser.parse(jsonPath.toString(), Optional.empty());
     assertTrue(serviceConfigOpt.isPresent());
@@ -204,7 +202,7 @@ public void codesDefinitionsBlock_basic() {
     Service service = services.get(0);
 
     String jsonFilename = "showcase_grpc_service_config.json";
-    Path jsonPath = Paths.get(TESTFILES_DIRECTORY, jsonFilename);
+    Path jsonPath = Paths.get(ComposerConstants.TESTFILES_DIRECTORY, jsonFilename);
     Optional<GapicServiceConfig> serviceConfigOpt =
         ServiceConfigParser.parse(jsonPath.toString(), Optional.empty());
     assertTrue(serviceConfigOpt.isPresent());
@@ -244,7 +242,7 @@ public void simpleBuilderExpr_basic() {
     Service service = services.get(0);
 
     String jsonFilename = "showcase_grpc_service_config.json";
-    Path jsonPath = Paths.get(TESTFILES_DIRECTORY, jsonFilename);
+    Path jsonPath = Paths.get(ComposerConstants.TESTFILES_DIRECTORY, jsonFilename);
     Optional<GapicServiceConfig> serviceConfigOpt =
         ServiceConfigParser.parse(jsonPath.toString(), Optional.empty());
     assertTrue(serviceConfigOpt.isPresent());
@@ -326,7 +324,7 @@ public void lroBuilderExpr() {
     Service service = services.get(0);
 
     String jsonFilename = "showcase_grpc_service_config.json";
-    Path jsonPath = Paths.get(TESTFILES_DIRECTORY, jsonFilename);
+    Path jsonPath = Paths.get(ComposerConstants.TESTFILES_DIRECTORY, jsonFilename);
     Optional<GapicServiceConfig> serviceConfigOpt =
         ServiceConfigParser.parse(jsonPath.toString(), Optional.empty());
     assertTrue(serviceConfigOpt.isPresent());
@@ -384,13 +382,13 @@ public void batchingSettings_minimalFlowControlSettings() {
             serviceFileDescriptor, messageTypes, resourceNames, outputResourceNames);
 
     String filename = "pubsub_gapic.yaml";
-    Path path = Paths.get(TESTFILES_DIRECTORY, filename);
+    Path path = Paths.get(ComposerConstants.TESTFILES_DIRECTORY, filename);
     Optional<List<GapicBatchingSettings>> batchingSettingsOpt =
         BatchingSettingsConfigParser.parse(Optional.of(path.toString()));
     assertTrue(batchingSettingsOpt.isPresent());
 
     String jsonFilename = "pubsub_grpc_service_config.json";
-    Path jsonPath = Paths.get(TESTFILES_DIRECTORY, jsonFilename);
+    Path jsonPath = Paths.get(ComposerConstants.TESTFILES_DIRECTORY, jsonFilename);
     Optional<GapicServiceConfig> configOpt =
         ServiceConfigParser.parse(jsonPath.toString(), batchingSettingsOpt);
     assertTrue(configOpt.isPresent());
@@ -461,13 +459,13 @@ public void batchingSettings_fullFlowControlSettings() {
             serviceFileDescriptor, messageTypes, resourceNames, outputResourceNames);
 
     String filename = "logging_gapic.yaml";
-    Path path = Paths.get(TESTFILES_DIRECTORY, filename);
+    Path path = Paths.get(ComposerConstants.TESTFILES_DIRECTORY, filename);
     Optional<List<GapicBatchingSettings>> batchingSettingsOpt =
         BatchingSettingsConfigParser.parse(Optional.of(path.toString()));
     assertTrue(batchingSettingsOpt.isPresent());
 
     String jsonFilename = "logging_grpc_service_config.json";
-    Path jsonPath = Paths.get(TESTFILES_DIRECTORY, jsonFilename);
+    Path jsonPath = Paths.get(ComposerConstants.TESTFILES_DIRECTORY, jsonFilename);
     Optional<GapicServiceConfig> configOpt =
         ServiceConfigParser.parse(jsonPath.toString(), batchingSettingsOpt);
     assertTrue(configOpt.isPresent());
diff --git a/src/test/java/com/google/api/generator/gapic/composer/ServiceSettingsClassComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/ServiceSettingsClassComposerTest.java
index d6f15a7676..0ba1c09956 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/ServiceSettingsClassComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/ServiceSettingsClassComposerTest.java
@@ -22,9 +22,12 @@
 import com.google.api.generator.gapic.model.ResourceName;
 import com.google.api.generator.gapic.model.Service;
 import com.google.api.generator.gapic.protoparser.Parser;
+import com.google.api.generator.test.framework.Assert;
 import com.google.protobuf.Descriptors.FileDescriptor;
 import com.google.protobuf.Descriptors.ServiceDescriptor;
 import com.google.showcase.v1beta1.EchoOuterClass;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
@@ -57,272 +60,7 @@ public void generateServiceClasses() {
 
     JavaWriterVisitor visitor = new JavaWriterVisitor();
     clazz.classDefinition().accept(visitor);
-    assertEquals(EXPECTED_CLASS_STRING, visitor.write());
+    Path goldenFilePath = Paths.get(ComposerConstants.GOLDENFILES_DIRECTORY, "EchoSettings.golden");
+    Assert.assertCodeEquals(goldenFilePath, visitor.write());
   }
-
-  // TODO(miraleung): Update this when a file-diffing test mechanism is in place.
-  private static final String EXPECTED_CLASS_STRING =
-      "package com.google.showcase.v1beta1;\n"
-          + "\n"
-          + "import static com.google.showcase.v1beta1.EchoClient.PagedExpandPagedResponse;\n"
-          + "\n"
-          + "import com.google.api.core.ApiFunction;\n"
-          + "import com.google.api.core.BetaApi;\n"
-          + "import com.google.api.gax.core.GoogleCredentialsProvider;\n"
-          + "import com.google.api.gax.core.InstantiatingExecutorProvider;\n"
-          + "import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;\n"
-          + "import com.google.api.gax.rpc.ApiClientHeaderProvider;\n"
-          + "import com.google.api.gax.rpc.ClientContext;\n"
-          + "import com.google.api.gax.rpc.ClientSettings;\n"
-          + "import com.google.api.gax.rpc.OperationCallSettings;\n"
-          + "import com.google.api.gax.rpc.PagedCallSettings;\n"
-          + "import com.google.api.gax.rpc.ServerStreamingCallSettings;\n"
-          + "import com.google.api.gax.rpc.StreamingCallSettings;\n"
-          + "import com.google.api.gax.rpc.StubSettings;\n"
-          + "import com.google.api.gax.rpc.TransportChannelProvider;\n"
-          + "import com.google.api.gax.rpc.UnaryCallSettings;\n"
-          + "import com.google.longrunning.Operation;\n"
-          + "import com.google.showcase.v1beta1.stub.EchoStubSettings;\n"
-          + "import java.io.IOException;\n"
-          + "import java.util.List;\n"
-          + "import javax.annotation.Generated;\n"
-          + "\n"
-          + "// AUTO-GENERATED DOCUMENTATION AND CLASS.\n"
-          + "/**\n"
-          + " * Settings class to configure an instance of {@link EchoClient}.\n"
-          + " *\n"
-          + " * <p>The default instance has everything set to sensible defaults:\n"
-          + " *\n"
-          + " * <ul>\n"
-          + " *   <li>The default service address (localhost) and default port (7469) are used.\n"
-          + " *   <li>Credentials are acquired automatically through Application Default"
-          + " Credentials.\n"
-          + " *   <li>Retries are configured for idempotent methods but not for non-idempotent"
-          + " methods.\n"
-          + " * </ul>\n"
-          + " *\n"
-          + " * <p>The builder of this class is recursive, so contained classes are themselves"
-          + " builders. When\n"
-          + " * build() is called, the tree of builders is called to create the complete settings"
-          + " object.\n"
-          + " *\n"
-          + " * <p>For example, to set the total timeout of echo to 30 seconds:\n"
-          + " */\n"
-          + "@Generated(\"by gapic-generator-java\")\n"
-          + "public class EchoSettings extends ClientSettings<EchoSettings> {\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to echo. */\n"
-          + "  public UnaryCallSettings<EchoRequest, EchoResponse> echoSettings() {\n"
-          + "    return ((EchoStubSettings) getStubSettings()).echoSettings();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to expand. */\n"
-          + "  public ServerStreamingCallSettings<ExpandRequest, EchoResponse> expandSettings()"
-          + " {\n"
-          + "    return ((EchoStubSettings) getStubSettings()).expandSettings();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to collect. */\n"
-          + "  public StreamingCallSettings<EchoRequest, EchoResponse> collectSettings() {\n"
-          + "    return ((EchoStubSettings) getStubSettings()).collectSettings();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to chat. */\n"
-          + "  public StreamingCallSettings<EchoRequest, EchoResponse> chatSettings() {\n"
-          + "    return ((EchoStubSettings) getStubSettings()).chatSettings();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to chatAgain. */\n"
-          + "  public StreamingCallSettings<EchoRequest, EchoResponse> chatAgainSettings() {\n"
-          + "    return ((EchoStubSettings) getStubSettings()).chatAgainSettings();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to pagedExpand. */\n"
-          + "  public PagedCallSettings<PagedExpandRequest, PagedExpandResponse,"
-          + " PagedExpandPagedResponse>\n"
-          + "      pagedExpandSettings() {\n"
-          + "    return ((EchoStubSettings) getStubSettings()).pagedExpandSettings();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to wait. */\n"
-          + "  public UnaryCallSettings<WaitRequest, Operation> waitSettings() {\n"
-          + "    return ((EchoStubSettings) getStubSettings()).waitSettings();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to wait. */\n"
-          + "  public OperationCallSettings<WaitRequest, WaitResponse, WaitMetadata>"
-          + " waitOperationSettings() {\n"
-          + "    return ((EchoStubSettings) getStubSettings()).waitOperationSettings();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to block. */\n"
-          + "  public UnaryCallSettings<BlockRequest, BlockResponse> blockSettings() {\n"
-          + "    return ((EchoStubSettings) getStubSettings()).blockSettings();\n"
-          + "  }\n"
-          + "\n"
-          + "  public static final EchoSettings create(EchoStubSettings stub) throws IOException"
-          + " {\n"
-          + "    return new EchoSettings.Builder(stub.toBuilder()).build();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a builder for the default ExecutorProvider for this service. */\n"
-          + "  public static InstantiatingExecutorProvider.Builder"
-          + " defaultExecutorProviderBuilder() {\n"
-          + "    return EchoStubSettings.defaultExecutorProviderBuilder();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the default service endpoint. */\n"
-          + "  public static String getDefaultEndpoint() {\n"
-          + "    return EchoStubSettings.getDefaultEndpoint();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the default service scopes. */\n"
-          + "  public static List<String> getDefaultServiceScopes() {\n"
-          + "    return EchoStubSettings.getDefaultServiceScopes();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a builder for the default credentials for this service. */\n"
-          + "  public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilder()"
-          + " {\n"
-          + "    return EchoStubSettings.defaultCredentialsProviderBuilder();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a builder for the default ChannelProvider for this service. */\n"
-          + "  public static InstantiatingGrpcChannelProvider.Builder"
-          + " defaultGrpcTransportProviderBuilder() {\n"
-          + "    return EchoStubSettings.defaultGrpcTransportProviderBuilder();\n"
-          + "  }\n"
-          + "\n"
-          + "  public static TransportChannelProvider defaultTransportChannelProvider() {\n"
-          + "    return EchoStubSettings.defaultTransportChannelProvider();\n"
-          + "  }\n"
-          + "\n"
-          + "  @BetaApi(\"The surface for customizing headers is not stable yet and may change in"
-          + " the future.\")\n"
-          + "  public static ApiClientHeaderProvider.Builder"
-          + " defaultApiClientHeaderProviderBuilder() {\n"
-          + "    return EchoStubSettings.defaultApiClientHeaderProviderBuilder();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a new builder for this class. */\n"
-          + "  public static Builder newBuilder() {\n"
-          + "    return Builder.createDefault();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a new builder for this class. */\n"
-          + "  public static Builder newBuilder(ClientContext clientContext) {\n"
-          + "    return new Builder(clientContext);\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a builder containing all the values of this settings class. */\n"
-          + "  public Builder toBuilder() {\n"
-          + "    return new Builder(this);\n"
-          + "  }\n"
-          + "\n"
-          + "  protected EchoSettings(Builder settingsBuilder) throws IOException {\n"
-          + "    super(settingsBuilder);\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Builder for EchoSettings. */\n"
-          + "  public static class Builder extends ClientSettings.Builder<EchoSettings, Builder>"
-          + " {\n"
-          + "\n"
-          + "    protected Builder() throws IOException {\n"
-          + "      this(((ClientContext) null));\n"
-          + "    }\n"
-          + "\n"
-          + "    protected Builder(ClientContext clientContext) {\n"
-          + "      super(EchoStubSettings.newBuilder(clientContext));\n"
-          + "    }\n"
-          + "\n"
-          + "    protected Builder(EchoSettings settings) {\n"
-          + "      super(settings.getStubSettings().toBuilder());\n"
-          + "    }\n"
-          + "\n"
-          + "    protected Builder(EchoStubSettings.Builder stubSettings) {\n"
-          + "      super(stubSettings);\n"
-          + "    }\n"
-          + "\n"
-          + "    private static Builder createDefault() {\n"
-          + "      return new Builder(EchoStubSettings.newBuilder());\n"
-          + "    }\n"
-          + "\n"
-          + "    public EchoStubSettings.Builder getStubSettingsBuilder() {\n"
-          + "      return ((EchoStubSettings.Builder) getStubSettings());\n"
-          + "    }\n"
-          + "\n"
-          + "    // NEXT_MAJOR_VER: remove 'throws Exception'.\n"
-          + "    /**\n"
-          + "     * Applies the given settings updater function to all of the unary API methods in"
-          + " this service.\n"
-          + "     *\n"
-          + "     * <p>Note: This method does not support applying settings to streaming"
-          + " methods.\n"
-          + "     */\n"
-          + "    public Builder applyToAllUnaryMethods(\n"
-          + "        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) throws"
-          + " Exception {\n"
-          + "      super.applyToAllUnaryMethods(\n"
-          + "          getStubSettingsBuilder().unaryMethodSettingsBuilders(), settingsUpdater);\n"
-          + "      return this;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to echo. */\n"
-          + "    public UnaryCallSettings.Builder<EchoRequest, EchoResponse> echoSettings() {\n"
-          + "      return getStubSettingsBuilder().echoSettings();\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to expand. */\n"
-          + "    public ServerStreamingCallSettings.Builder<ExpandRequest, EchoResponse>"
-          + " expandSettings() {\n"
-          + "      return getStubSettingsBuilder().expandSettings();\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to collect. */\n"
-          + "    public StreamingCallSettings.Builder<EchoRequest, EchoResponse> collectSettings()"
-          + " {\n"
-          + "      return getStubSettingsBuilder().collectSettings();\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to chat. */\n"
-          + "    public StreamingCallSettings.Builder<EchoRequest, EchoResponse> chatSettings()"
-          + " {\n"
-          + "      return getStubSettingsBuilder().chatSettings();\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to chatAgain. */\n"
-          + "    public StreamingCallSettings.Builder<EchoRequest, EchoResponse>"
-          + " chatAgainSettings() {\n"
-          + "      return getStubSettingsBuilder().chatAgainSettings();\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to pagedExpand. */\n"
-          + "    public PagedCallSettings.Builder<\n"
-          + "            PagedExpandRequest, PagedExpandResponse, PagedExpandPagedResponse>\n"
-          + "        pagedExpandSettings() {\n"
-          + "      return getStubSettingsBuilder().pagedExpandSettings();\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to wait. */\n"
-          + "    public UnaryCallSettings.Builder<WaitRequest, Operation> waitSettings() {\n"
-          + "      return getStubSettingsBuilder().waitSettings();\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to wait. */\n"
-          + "    public OperationCallSettings.Builder<WaitRequest, WaitResponse, WaitMetadata>\n"
-          + "        waitOperationSettings() {\n"
-          + "      return getStubSettingsBuilder().waitOperationSettings();\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to block. */\n"
-          + "    public UnaryCallSettings.Builder<BlockRequest, BlockResponse> blockSettings() {\n"
-          + "      return getStubSettingsBuilder().blockSettings();\n"
-          + "    }\n"
-          + "\n"
-          + "    @Override\n"
-          + "    public EchoSettings build() throws IOException {\n"
-          + "      return new EchoSettings(this);\n"
-          + "    }\n"
-          + "  }\n"
-          + "}\n";
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/ServiceStubClassComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/ServiceStubClassComposerTest.java
index 217d4375b7..e282bec281 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/ServiceStubClassComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/ServiceStubClassComposerTest.java
@@ -22,9 +22,12 @@
 import com.google.api.generator.gapic.model.ResourceName;
 import com.google.api.generator.gapic.model.Service;
 import com.google.api.generator.gapic.protoparser.Parser;
+import com.google.api.generator.test.framework.Assert;
 import com.google.protobuf.Descriptors.FileDescriptor;
 import com.google.protobuf.Descriptors.ServiceDescriptor;
 import com.google.showcase.v1beta1.EchoOuterClass;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
@@ -56,98 +59,7 @@ public void generateServiceClasses() {
 
     JavaWriterVisitor visitor = new JavaWriterVisitor();
     clazz.classDefinition().accept(visitor);
-    assertEquals(EXPECTED_CLASS_STRING, visitor.write());
+    Path goldenFilePath = Paths.get(ComposerConstants.GOLDENFILES_DIRECTORY, "EchoStub.golden");
+    Assert.assertCodeEquals(goldenFilePath, visitor.write());
   }
-
-  // TODO(miraleung): Update this when a file-diffing test mechanism is in place.
-  private static final String EXPECTED_CLASS_STRING =
-      "package com.google.showcase.v1beta1.stub;\n"
-          + "\n"
-          + "import static com.google.showcase.v1beta1.EchoClient.PagedExpandPagedResponse;\n"
-          + "\n"
-          + "import com.google.api.gax.core.BackgroundResource;\n"
-          + "import com.google.api.gax.rpc.BidiStreamingCallable;\n"
-          + "import com.google.api.gax.rpc.ClientStreamingCallable;\n"
-          + "import com.google.api.gax.rpc.OperationCallable;\n"
-          + "import com.google.api.gax.rpc.ServerStreamingCallable;\n"
-          + "import com.google.api.gax.rpc.UnaryCallable;\n"
-          + "import com.google.longrunning.Operation;\n"
-          + "import com.google.longrunning.stub.OperationsStub;\n"
-          + "import com.google.showcase.v1beta1.BlockRequest;\n"
-          + "import com.google.showcase.v1beta1.BlockResponse;\n"
-          + "import com.google.showcase.v1beta1.EchoRequest;\n"
-          + "import com.google.showcase.v1beta1.EchoResponse;\n"
-          + "import com.google.showcase.v1beta1.ExpandRequest;\n"
-          + "import com.google.showcase.v1beta1.PagedExpandRequest;\n"
-          + "import com.google.showcase.v1beta1.PagedExpandResponse;\n"
-          + "import com.google.showcase.v1beta1.WaitMetadata;\n"
-          + "import com.google.showcase.v1beta1.WaitRequest;\n"
-          + "import com.google.showcase.v1beta1.WaitResponse;\n"
-          + "import javax.annotation.Generated;\n"
-          + "\n"
-          + "// AUTO-GENERATED DOCUMENTATION AND CLASS.\n"
-          + "/**\n"
-          + " * Base stub class for the Echo service API.\n"
-          + " *\n"
-          + " * <p>This class is for advanced usage and reflects the underlying API directly.\n"
-          + " */\n"
-          + "@Generated(\"by gapic-generator\")\n"
-          + "public abstract class EchoStub implements BackgroundResource {\n"
-          + "\n"
-          + "  public OperationsStub getOperationsStub() {\n"
-          + "    throw new UnsupportedOperationException(\"Not implemented:"
-          + " getOperationsStub()\");\n"
-          + "  }\n"
-          + "\n"
-          + "  public UnaryCallable<EchoRequest, EchoResponse> echoCallable() {\n"
-          + "    throw new UnsupportedOperationException(\"Not implemented: echoCallable()\");\n"
-          + "  }\n"
-          + "\n"
-          + "  public ServerStreamingCallable<ExpandRequest, EchoResponse> expandCallable() {\n"
-          + "    throw new UnsupportedOperationException(\"Not implemented: expandCallable()\");\n"
-          + "  }\n"
-          + "\n"
-          + "  public ClientStreamingCallable<EchoRequest, EchoResponse> collectCallable() {\n"
-          + "    throw new UnsupportedOperationException(\"Not implemented:"
-          + " collectCallable()\");\n"
-          + "  }\n"
-          + "\n"
-          + "  public BidiStreamingCallable<EchoRequest, EchoResponse> chatCallable() {\n"
-          + "    throw new UnsupportedOperationException(\"Not implemented: chatCallable()\");\n"
-          + "  }\n"
-          + "\n"
-          + "  public BidiStreamingCallable<EchoRequest, EchoResponse> chatAgainCallable() {\n"
-          + "    throw new UnsupportedOperationException(\"Not implemented:"
-          + " chatAgainCallable()\");\n"
-          + "  }\n"
-          + "\n"
-          + "  public UnaryCallable<PagedExpandRequest, PagedExpandPagedResponse>"
-          + " pagedExpandPagedCallable() {\n"
-          + "    throw new UnsupportedOperationException(\"Not implemented:"
-          + " pagedExpandPagedCallable()\");\n"
-          + "  }\n"
-          + "\n"
-          + "  public UnaryCallable<PagedExpandRequest, PagedExpandResponse> pagedExpandCallable()"
-          + " {\n"
-          + "    throw new UnsupportedOperationException(\"Not implemented:"
-          + " pagedExpandCallable()\");\n"
-          + "  }\n"
-          + "\n"
-          + "  public OperationCallable<WaitRequest, WaitResponse, WaitMetadata>"
-          + " waitOperationCallable() {\n"
-          + "    throw new UnsupportedOperationException(\"Not implemented:"
-          + " waitOperationCallable()\");\n"
-          + "  }\n"
-          + "\n"
-          + "  public UnaryCallable<WaitRequest, Operation> waitCallable() {\n"
-          + "    throw new UnsupportedOperationException(\"Not implemented: waitCallable()\");\n"
-          + "  }\n"
-          + "\n"
-          + "  public UnaryCallable<BlockRequest, BlockResponse> blockCallable() {\n"
-          + "    throw new UnsupportedOperationException(\"Not implemented: blockCallable()\");\n"
-          + "  }\n"
-          + "\n"
-          + "  @Override\n"
-          + "  public abstract void close();\n"
-          + "}\n";
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/ServiceStubSettingsClassComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/ServiceStubSettingsClassComposerTest.java
index 690c685ec1..da0308a349 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/ServiceStubSettingsClassComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/ServiceStubSettingsClassComposerTest.java
@@ -27,6 +27,7 @@
 import com.google.api.generator.gapic.protoparser.BatchingSettingsConfigParser;
 import com.google.api.generator.gapic.protoparser.Parser;
 import com.google.api.generator.gapic.protoparser.ServiceConfigParser;
+import com.google.api.generator.test.framework.Assert;
 import com.google.logging.v2.LogEntryProto;
 import com.google.logging.v2.LoggingConfigProto;
 import com.google.logging.v2.LoggingMetricsProto;
@@ -36,6 +37,7 @@
 import com.google.pubsub.v1.PubsubProto;
 import com.google.showcase.v1beta1.EchoOuterClass;
 import google.cloud.CommonResources;
+import java.io.IOException;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.Arrays;
@@ -48,11 +50,9 @@
 import org.junit.Test;
 
 public class ServiceStubSettingsClassComposerTest {
-  private static final String TESTFILES_DIRECTORY =
-      "src/test/java/com/google/api/generator/gapic/testdata/";
 
   @Test
-  public void generateServiceStubSettingsClasses_batchingWithEmptyResponses() {
+  public void generateServiceStubSettingsClasses_batchingWithEmptyResponses() throws IOException {
     FileDescriptor serviceFileDescriptor = LoggingProto.getDescriptor();
     ServiceDescriptor serviceDescriptor = serviceFileDescriptor.getServices().get(0);
     assertEquals(serviceDescriptor.getName(), "LoggingServiceV2");
@@ -75,13 +75,13 @@ public void generateServiceStubSettingsClasses_batchingWithEmptyResponses() {
         parseServices(serviceFileDescriptor, serviceDescriptor, messageTypes, resourceNames);
 
     String filename = "logging_gapic.yaml";
-    Path path = Paths.get(TESTFILES_DIRECTORY, filename);
+    Path path = Paths.get(ComposerConstants.TESTFILES_DIRECTORY, filename);
     Optional<List<GapicBatchingSettings>> batchingSettingsOpt =
         BatchingSettingsConfigParser.parse(Optional.of(path.toString()));
     assertTrue(batchingSettingsOpt.isPresent());
 
     String jsonFilename = "logging_grpc_service_config.json";
-    Path jsonPath = Paths.get(TESTFILES_DIRECTORY, jsonFilename);
+    Path jsonPath = Paths.get(ComposerConstants.TESTFILES_DIRECTORY, jsonFilename);
     Optional<GapicServiceConfig> configOpt =
         ServiceConfigParser.parse(jsonPath.toString(), batchingSettingsOpt);
     assertTrue(configOpt.isPresent());
@@ -93,11 +93,14 @@ public void generateServiceStubSettingsClasses_batchingWithEmptyResponses() {
 
     JavaWriterVisitor visitor = new JavaWriterVisitor();
     clazz.classDefinition().accept(visitor);
-    assertEquals(EXPECTED_LOGGING_STUB_SETTINGS_STRING, visitor.write());
+    Path goldenFilePath =
+        Paths.get(ComposerConstants.GOLDENFILES_DIRECTORY, "LoggingServiceV2StubSettings.golden");
+    Assert.assertCodeEquals(goldenFilePath, visitor.write());
   }
 
   @Test
-  public void generateServiceStubSettingsClasses_batchingWithNonemptyResponses() {
+  public void generateServiceStubSettingsClasses_batchingWithNonemptyResponses()
+      throws IOException {
     FileDescriptor serviceFileDescriptor = PubsubProto.getDescriptor();
     FileDescriptor commonResourcesFileDescriptor = CommonResources.getDescriptor();
     ServiceDescriptor serviceDescriptor = serviceFileDescriptor.getServices().get(0);
@@ -113,13 +116,13 @@ public void generateServiceStubSettingsClasses_batchingWithNonemptyResponses() {
         parseServices(serviceFileDescriptor, serviceDescriptor, messageTypes, resourceNames);
 
     String filename = "pubsub_gapic.yaml";
-    Path path = Paths.get(TESTFILES_DIRECTORY, filename);
+    Path path = Paths.get(ComposerConstants.TESTFILES_DIRECTORY, filename);
     Optional<List<GapicBatchingSettings>> batchingSettingsOpt =
         BatchingSettingsConfigParser.parse(Optional.of(path.toString()));
     assertTrue(batchingSettingsOpt.isPresent());
 
     String jsonFilename = "pubsub_grpc_service_config.json";
-    Path jsonPath = Paths.get(TESTFILES_DIRECTORY, jsonFilename);
+    Path jsonPath = Paths.get(ComposerConstants.TESTFILES_DIRECTORY, jsonFilename);
     Optional<GapicServiceConfig> configOpt =
         ServiceConfigParser.parse(jsonPath.toString(), batchingSettingsOpt);
     assertTrue(configOpt.isPresent());
@@ -132,11 +135,13 @@ public void generateServiceStubSettingsClasses_batchingWithNonemptyResponses() {
 
     JavaWriterVisitor visitor = new JavaWriterVisitor();
     clazz.classDefinition().accept(visitor);
-    assertEquals(EXPECTED_PUBLISHER_STUB_SETTINGS_STRING, visitor.write());
+    Path goldenFilePath =
+        Paths.get(ComposerConstants.GOLDENFILES_DIRECTORY, "PublisherStubSettings.golden");
+    Assert.assertCodeEquals(goldenFilePath, visitor.write());
   }
 
   @Test
-  public void generateServiceStubSettingsClasses_basic() {
+  public void generateServiceStubSettingsClasses_basic() throws IOException {
     FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
     ServiceDescriptor echoServiceDescriptor = echoFileDescriptor.getServices().get(0);
     assertEquals(echoServiceDescriptor.getName(), "Echo");
@@ -147,7 +152,7 @@ public void generateServiceStubSettingsClasses_basic() {
         parseServices(echoFileDescriptor, echoServiceDescriptor, messageTypes, resourceNames);
 
     String jsonFilename = "showcase_grpc_service_config.json";
-    Path jsonPath = Paths.get(TESTFILES_DIRECTORY, jsonFilename);
+    Path jsonPath = Paths.get(ComposerConstants.TESTFILES_DIRECTORY, jsonFilename);
     Optional<GapicServiceConfig> configOpt =
         ServiceConfigParser.parse(jsonPath.toString(), Optional.empty());
     assertTrue(configOpt.isPresent());
@@ -160,7 +165,9 @@ public void generateServiceStubSettingsClasses_basic() {
 
     JavaWriterVisitor visitor = new JavaWriterVisitor();
     clazz.classDefinition().accept(visitor);
-    assertEquals(EXPECTED_ECHO_STUB_SETTINGS_STRING, visitor.write());
+    Path goldenFilePath =
+        Paths.get(ComposerConstants.GOLDENFILES_DIRECTORY, "EchoStubSettings.golden");
+    Assert.assertCodeEquals(goldenFilePath, visitor.write());
   }
 
   private static List<Service> parseServices(
@@ -172,2158 +179,4 @@ private static List<Service> parseServices(
     return Parser.parseService(
         protoFileDescriptor, messageTypes, resourceNames, outputResourceNames);
   }
-
-  // TODO(miraleung): Update this when a file-diffing test mechanism is in place.
-  private static final String EXPECTED_ECHO_STUB_SETTINGS_STRING =
-      "package com.google.showcase.v1beta1.stub;\n"
-          + "\n"
-          + "import static com.google.showcase.v1beta1.EchoClient.PagedExpandPagedResponse;\n"
-          + "\n"
-          + "import com.google.api.core.ApiFunction;\n"
-          + "import com.google.api.core.ApiFuture;\n"
-          + "import com.google.api.core.BetaApi;\n"
-          + "import com.google.api.gax.core.GaxProperties;\n"
-          + "import com.google.api.gax.core.GoogleCredentialsProvider;\n"
-          + "import com.google.api.gax.core.InstantiatingExecutorProvider;\n"
-          + "import com.google.api.gax.grpc.GaxGrpcProperties;\n"
-          + "import com.google.api.gax.grpc.GrpcTransportChannel;\n"
-          + "import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;\n"
-          + "import com.google.api.gax.grpc.ProtoOperationTransformers;\n"
-          + "import com.google.api.gax.longrunning.OperationSnapshot;\n"
-          + "import com.google.api.gax.longrunning.OperationTimedPollAlgorithm;\n"
-          + "import com.google.api.gax.retrying.RetrySettings;\n"
-          + "import com.google.api.gax.rpc.ApiCallContext;\n"
-          + "import com.google.api.gax.rpc.ApiClientHeaderProvider;\n"
-          + "import com.google.api.gax.rpc.ClientContext;\n"
-          + "import com.google.api.gax.rpc.OperationCallSettings;\n"
-          + "import com.google.api.gax.rpc.PageContext;\n"
-          + "import com.google.api.gax.rpc.PagedCallSettings;\n"
-          + "import com.google.api.gax.rpc.PagedListDescriptor;\n"
-          + "import com.google.api.gax.rpc.PagedListResponseFactory;\n"
-          + "import com.google.api.gax.rpc.ServerStreamingCallSettings;\n"
-          + "import com.google.api.gax.rpc.StatusCode;\n"
-          + "import com.google.api.gax.rpc.StreamingCallSettings;\n"
-          + "import com.google.api.gax.rpc.StubSettings;\n"
-          + "import com.google.api.gax.rpc.TransportChannelProvider;\n"
-          + "import com.google.api.gax.rpc.UnaryCallSettings;\n"
-          + "import com.google.api.gax.rpc.UnaryCallable;\n"
-          + "import com.google.common.collect.ImmutableList;\n"
-          + "import com.google.common.collect.ImmutableMap;\n"
-          + "import com.google.common.collect.ImmutableSet;\n"
-          + "import com.google.common.collect.Lists;\n"
-          + "import com.google.longrunning.Operation;\n"
-          + "import com.google.showcase.v1beta1.BlockRequest;\n"
-          + "import com.google.showcase.v1beta1.BlockResponse;\n"
-          + "import com.google.showcase.v1beta1.EchoRequest;\n"
-          + "import com.google.showcase.v1beta1.EchoResponse;\n"
-          + "import com.google.showcase.v1beta1.ExpandRequest;\n"
-          + "import com.google.showcase.v1beta1.PagedExpandRequest;\n"
-          + "import com.google.showcase.v1beta1.PagedExpandResponse;\n"
-          + "import com.google.showcase.v1beta1.WaitMetadata;\n"
-          + "import com.google.showcase.v1beta1.WaitRequest;\n"
-          + "import com.google.showcase.v1beta1.WaitResponse;\n"
-          + "import java.io.IOException;\n"
-          + "import java.util.List;\n"
-          + "import java.util.Objects;\n"
-          + "import javax.annotation.Generated;\n"
-          + "import org.threeten.bp.Duration;\n"
-          + "\n"
-          + "// AUTO-GENERATED DOCUMENTATION AND CLASS.\n"
-          + "/**\n"
-          + " * Settings class to configure an instance of {@link EchoStub}.\n"
-          + " *\n"
-          + " * <p>The default instance has everything set to sensible defaults:\n"
-          + " *\n"
-          + " * <ul>\n"
-          + " *   <li>The default service address (localhost) and default port (7469) are used.\n"
-          + " *   <li>Credentials are acquired automatically through Application Default"
-          + " Credentials.\n"
-          + " *   <li>Retries are configured for idempotent methods but not for non-idempotent"
-          + " methods.\n"
-          + " * </ul>\n"
-          + " *\n"
-          + " * <p>The builder of this class is recursive, so contained classes are themselves"
-          + " builders. When\n"
-          + " * build() is called, the tree of builders is called to create the complete settings"
-          + " object.\n"
-          + " *\n"
-          + " * <p>For example, to set the total timeout of echo to 30 seconds:\n"
-          + " */\n"
-          + "@BetaApi\n"
-          + "@Generated(\"by gapic-generator-java\")\n"
-          + "public class EchoStubSettings extends StubSettings<EchoStubSettings> {\n"
-          + "  /** The default scopes of the service. */\n"
-          + "  private static final ImmutableList<String> DEFAULT_SERVICE_SCOPES =\n"
-          + "     "
-          + " ImmutableList.<String>builder().add(\"https://www.googleapis.com/auth/cloud-platform\").build();\n"
-          + "\n"
-          + "  private final UnaryCallSettings<EchoRequest, EchoResponse> echoSettings;\n"
-          + "  private final ServerStreamingCallSettings<ExpandRequest, EchoResponse>"
-          + " expandSettings;\n"
-          + "  private final StreamingCallSettings<EchoRequest, EchoResponse> collectSettings;\n"
-          + "  private final StreamingCallSettings<EchoRequest, EchoResponse> chatSettings;\n"
-          + "  private final StreamingCallSettings<EchoRequest, EchoResponse> chatAgainSettings;\n"
-          + "  private final PagedCallSettings<PagedExpandRequest, PagedExpandResponse,"
-          + " PagedExpandPagedResponse>\n"
-          + "      pagedExpandSettings;\n"
-          + "  private final UnaryCallSettings<WaitRequest, Operation> waitSettings;\n"
-          + "  private final OperationCallSettings<WaitRequest, WaitResponse, WaitMetadata>\n"
-          + "      waitOperationSettings;\n"
-          + "  private final UnaryCallSettings<BlockRequest, BlockResponse> blockSettings;\n"
-          + "  private static final PagedListDescriptor<PagedExpandRequest, PagedExpandResponse,"
-          + " EchoResponse>\n"
-          + "      PAGED_EXPAND_PAGE_STR_DESC =\n"
-          + "          new PagedListDescriptor<PagedExpandRequest, PagedExpandResponse,"
-          + " EchoResponse>() {\n"
-          + "            @Override\n"
-          + "            public String emptyToken() {\n"
-          + "              return \"\";\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public PagedExpandRequest injectToken(PagedExpandRequest payload, String"
-          + " token) {\n"
-          + "              return"
-          + " PagedExpandRequest.newBuilder(payload).setPageToken(token).build();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public PagedExpandRequest injectPageSize(PagedExpandRequest payload, int"
-          + " pageSize) {\n"
-          + "              return"
-          + " PagedExpandRequest.newBuilder(payload).setPageSize(pageSize).build();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public Integer extractPageSize(PagedExpandRequest payload) {\n"
-          + "              return payload.getPageSize();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public String extractNextToken(PagedExpandResponse payload) {\n"
-          + "              return payload.getNextPageToken();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public Iterable<EchoResponse> extractResources(PagedExpandResponse"
-          + " payload) {\n"
-          + "              return Objects.isNull(payload.getResponsesList())\n"
-          + "                  ? ImmutableList.<EchoResponse>of()\n"
-          + "                  : payload.getResponsesList();\n"
-          + "            }\n"
-          + "          };\n"
-          + "  private static final PagedListResponseFactory<\n"
-          + "          PagedExpandRequest, PagedExpandResponse, PagedExpandPagedResponse>\n"
-          + "      PAGED_EXPAND_PAGE_STR_FACT =\n"
-          + "          new PagedListResponseFactory<\n"
-          + "              PagedExpandRequest, PagedExpandResponse, PagedExpandPagedResponse>()"
-          + " {\n"
-          + "            @Override\n"
-          + "            public ApiFuture<PagedExpandPagedResponse> getFuturePagedResponse(\n"
-          + "                UnaryCallable<PagedExpandRequest, PagedExpandResponse> callable,\n"
-          + "                PagedExpandRequest request,\n"
-          + "                ApiCallContext context,\n"
-          + "                ApiFuture<PagedExpandResponse> futureResponse) {\n"
-          + "              PageContext<PagedExpandRequest, PagedExpandResponse, EchoResponse>"
-          + " pageContext =\n"
-          + "                  PageContext.create(callable, PAGED_EXPAND_PAGE_STR_DESC, request,"
-          + " context);\n"
-          + "              return PagedExpandPagedResponse.createAsync(pageContext,"
-          + " futureResponse);\n"
-          + "            }\n"
-          + "          };\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to echo. */\n"
-          + "  public UnaryCallSettings<EchoRequest, EchoResponse> echoSettings() {\n"
-          + "    return echoSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to expand. */\n"
-          + "  public ServerStreamingCallSettings<ExpandRequest, EchoResponse> expandSettings()"
-          + " {\n"
-          + "    return expandSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to collect. */\n"
-          + "  public StreamingCallSettings<EchoRequest, EchoResponse> collectSettings() {\n"
-          + "    return collectSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to chat. */\n"
-          + "  public StreamingCallSettings<EchoRequest, EchoResponse> chatSettings() {\n"
-          + "    return chatSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to chatAgain. */\n"
-          + "  public StreamingCallSettings<EchoRequest, EchoResponse> chatAgainSettings() {\n"
-          + "    return chatAgainSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to pagedExpand. */\n"
-          + "  public PagedCallSettings<PagedExpandRequest, PagedExpandResponse,"
-          + " PagedExpandPagedResponse>\n"
-          + "      pagedExpandSettings() {\n"
-          + "    return pagedExpandSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to wait. */\n"
-          + "  public UnaryCallSettings<WaitRequest, Operation> waitSettings() {\n"
-          + "    return waitSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to wait. */\n"
-          + "  public OperationCallSettings<WaitRequest, WaitResponse, WaitMetadata>"
-          + " waitOperationSettings() {\n"
-          + "    return waitOperationSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to block. */\n"
-          + "  public UnaryCallSettings<BlockRequest, BlockResponse> blockSettings() {\n"
-          + "    return blockSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  @BetaApi(\"A restructuring of stub classes is planned, so this may break in the"
-          + " future\")\n"
-          + "  public EchoStub createStub() throws IOException {\n"
-          + "    if (getTransportChannelProvider()\n"
-          + "        .getTransportName()\n"
-          + "        .equals(GrpcTransportChannel.getGrpcTransportName())) {\n"
-          + "      return GrpcEchoStub.create(this);\n"
-          + "    }\n"
-          + "    throw new UnsupportedOperationException(\n"
-          + "        String.format(\n"
-          + "            \"Transport not supported: %s\","
-          + " getTransportChannelProvider().getTransportName()));\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a builder for the default ExecutorProvider for this service. */\n"
-          + "  public static InstantiatingExecutorProvider.Builder"
-          + " defaultExecutorProviderBuilder() {\n"
-          + "    return InstantiatingExecutorProvider.newBuilder();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the default service endpoint. */\n"
-          + "  public static String getDefaultEndpoint() {\n"
-          + "    return \"localhost:7469\";\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the default service scopes. */\n"
-          + "  public static List<String> getDefaultServiceScopes() {\n"
-          + "    return DEFAULT_SERVICE_SCOPES;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a builder for the default credentials for this service. */\n"
-          + "  public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilder()"
-          + " {\n"
-          + "    return"
-          + " GoogleCredentialsProvider.newBuilder().setScopesToApply(DEFAULT_SERVICE_SCOPES);\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a builder for the default ChannelProvider for this service. */\n"
-          + "  public static InstantiatingGrpcChannelProvider.Builder"
-          + " defaultGrpcTransportProviderBuilder() {\n"
-          + "    return InstantiatingGrpcChannelProvider.newBuilder()\n"
-          + "        .setMaxInboundMessageSize(Integer.MAX_VALUE);\n"
-          + "  }\n"
-          + "\n"
-          + "  public static TransportChannelProvider defaultTransportChannelProvider() {\n"
-          + "    return defaultGrpcTransportProviderBuilder().build();\n"
-          + "  }\n"
-          + "\n"
-          + "  @BetaApi(\"The surface for customizing headers is not stable yet and may change in"
-          + " the future.\")\n"
-          + "  public static ApiClientHeaderProvider.Builder"
-          + " defaultApiClientHeaderProviderBuilder() {\n"
-          + "    return ApiClientHeaderProvider.newBuilder()\n"
-          + "        .setGeneratedLibToken(\"gapic\","
-          + " GaxProperties.getLibraryVersion(EchoStubSettings.class))\n"
-          + "        .setTransportToken(\n"
-          + "            GaxGrpcProperties.getGrpcTokenName(),"
-          + " GaxGrpcProperties.getGrpcVersion());\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a new builder for this class. */\n"
-          + "  public static Builder newBuilder() {\n"
-          + "    return Builder.createDefault();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a new builder for this class. */\n"
-          + "  public static Builder newBuilder(ClientContext clientContext) {\n"
-          + "    return new Builder(clientContext);\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a builder containing all the values of this settings class. */\n"
-          + "  public Builder toBuilder() {\n"
-          + "    return new Builder(this);\n"
-          + "  }\n"
-          + "\n"
-          + "  protected EchoStubSettings(Builder settingsBuilder) throws IOException {\n"
-          + "    super(settingsBuilder);\n"
-          + "    echoSettings = settingsBuilder.echoSettings().build();\n"
-          + "    expandSettings = settingsBuilder.expandSettings().build();\n"
-          + "    collectSettings = settingsBuilder.collectSettings().build();\n"
-          + "    chatSettings = settingsBuilder.chatSettings().build();\n"
-          + "    chatAgainSettings = settingsBuilder.chatAgainSettings().build();\n"
-          + "    pagedExpandSettings = settingsBuilder.pagedExpandSettings().build();\n"
-          + "    waitSettings = settingsBuilder.waitSettings().build();\n"
-          + "    waitOperationSettings = settingsBuilder.waitOperationSettings().build();\n"
-          + "    blockSettings = settingsBuilder.blockSettings().build();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Builder for EchoStubSettings. */\n"
-          + "  public static class Builder extends StubSettings.Builder<EchoStubSettings, Builder>"
-          + " {\n"
-          + "    private final ImmutableList<UnaryCallSettings.Builder<?, ?>>"
-          + " unaryMethodSettingsBuilders;\n"
-          + "    private final UnaryCallSettings.Builder<EchoRequest, EchoResponse>"
-          + " echoSettings;\n"
-          + "    private final ServerStreamingCallSettings.Builder<ExpandRequest, EchoResponse>"
-          + " expandSettings;\n"
-          + "    private final StreamingCallSettings.Builder<EchoRequest, EchoResponse>"
-          + " collectSettings;\n"
-          + "    private final StreamingCallSettings.Builder<EchoRequest, EchoResponse>"
-          + " chatSettings;\n"
-          + "    private final StreamingCallSettings.Builder<EchoRequest, EchoResponse>"
-          + " chatAgainSettings;\n"
-          + "    private final PagedCallSettings.Builder<\n"
-          + "            PagedExpandRequest, PagedExpandResponse, PagedExpandPagedResponse>\n"
-          + "        pagedExpandSettings;\n"
-          + "    private final UnaryCallSettings.Builder<WaitRequest, Operation> waitSettings;\n"
-          + "    private final OperationCallSettings.Builder<WaitRequest, WaitResponse,"
-          + " WaitMetadata>\n"
-          + "        waitOperationSettings;\n"
-          + "    private final UnaryCallSettings.Builder<BlockRequest, BlockResponse>"
-          + " blockSettings;\n"
-          + "    private static final ImmutableMap<String, ImmutableSet<StatusCode.Code>>\n"
-          + "        RETRYABLE_CODE_DEFINITIONS;\n"
-          + "\n"
-          + "    static {\n"
-          + "      ImmutableMap.Builder<String, ImmutableSet<StatusCode.Code>> definitions =\n"
-          + "          ImmutableMap.builder();\n"
-          + "      definitions.put(\n"
-          + "          \"retry_policy_1_codes\",\n"
-          + "          ImmutableSet.copyOf(\n"
-          + "              Lists.<StatusCode.Code>newArrayList(\n"
-          + "                  StatusCode.Code.UNAVAILABLE, StatusCode.Code.UNKNOWN)));\n"
-          + "      definitions.put(\n"
-          + "          \"no_retry_0_codes\","
-          + " ImmutableSet.copyOf(Lists.<StatusCode.Code>newArrayList()));\n"
-          + "      RETRYABLE_CODE_DEFINITIONS = definitions.build();\n"
-          + "    }\n"
-          + "\n"
-          + "    private static final ImmutableMap<String, RetrySettings>"
-          + " RETRY_PARAM_DEFINITIONS;\n"
-          + "\n"
-          + "    static {\n"
-          + "      ImmutableMap.Builder<String, RetrySettings> definitions ="
-          + " ImmutableMap.builder();\n"
-          + "      RetrySettings settings = null;\n"
-          + "      settings =\n"
-          + "          RetrySettings.newBuilder()\n"
-          + "              .setInitialRetryDelay(Duration.ofMillis(100L))\n"
-          + "              .setRetryDelayMultiplier(2.0)\n"
-          + "              .setMaxRetryDelay(Duration.ofMillis(3000L))\n"
-          + "              .setInitialRpcTimeout(Duration.ofMillis(10000L))\n"
-          + "              .setRpcTimeoutMultiplier(1.0)\n"
-          + "              .setMaxRpcTimeout(Duration.ofMillis(10000L))\n"
-          + "              .setTotalTimeout(Duration.ofMillis(10000L))\n"
-          + "              .build();\n"
-          + "      definitions.put(\"retry_policy_1_params\", settings);\n"
-          + "      settings =\n"
-          + "          RetrySettings.newBuilder()\n"
-          + "              .setInitialRpcTimeout(Duration.ofMillis(5000L))\n"
-          + "              .setRpcTimeoutMultiplier(1.0)\n"
-          + "              .setMaxRpcTimeout(Duration.ofMillis(5000L))\n"
-          + "              .setTotalTimeout(Duration.ofMillis(5000L))\n"
-          + "              .build();\n"
-          + "      definitions.put(\"no_retry_0_params\", settings);\n"
-          + "      RETRY_PARAM_DEFINITIONS = definitions.build();\n"
-          + "    }\n"
-          + "\n"
-          + "    protected Builder() {\n"
-          + "      this(((ClientContext) null));\n"
-          + "    }\n"
-          + "\n"
-          + "    protected Builder(ClientContext clientContext) {\n"
-          + "      super(clientContext);\n"
-          + "      echoSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();\n"
-          + "      expandSettings = ServerStreamingCallSettings.newBuilder();\n"
-          + "      collectSettings = StreamingCallSettings.newBuilder();\n"
-          + "      chatSettings = StreamingCallSettings.newBuilder();\n"
-          + "      chatAgainSettings = StreamingCallSettings.newBuilder();\n"
-          + "      pagedExpandSettings ="
-          + " PagedCallSettings.newBuilder(PAGED_EXPAND_PAGE_STR_FACT);\n"
-          + "      waitSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();\n"
-          + "      waitOperationSettings = OperationCallSettings.newBuilder();\n"
-          + "      blockSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();\n"
-          + "      unaryMethodSettingsBuilders =\n"
-          + "          ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(\n"
-          + "              echoSettings, pagedExpandSettings, waitSettings, blockSettings);\n"
-          + "      initDefaults(this);\n"
-          + "    }\n"
-          + "\n"
-          + "    protected Builder(EchoStubSettings settings) {\n"
-          + "      super(settings);\n"
-          + "      echoSettings = settings.echoSettings.toBuilder();\n"
-          + "      expandSettings = settings.expandSettings.toBuilder();\n"
-          + "      collectSettings = settings.collectSettings.toBuilder();\n"
-          + "      chatSettings = settings.chatSettings.toBuilder();\n"
-          + "      chatAgainSettings = settings.chatAgainSettings.toBuilder();\n"
-          + "      pagedExpandSettings = settings.pagedExpandSettings.toBuilder();\n"
-          + "      waitSettings = settings.waitSettings.toBuilder();\n"
-          + "      waitOperationSettings = settings.waitOperationSettings.toBuilder();\n"
-          + "      blockSettings = settings.blockSettings.toBuilder();\n"
-          + "      unaryMethodSettingsBuilders =\n"
-          + "          ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(\n"
-          + "              echoSettings, pagedExpandSettings, waitSettings, blockSettings);\n"
-          + "    }\n"
-          + "\n"
-          + "    private static Builder createDefault() {\n"
-          + "      Builder builder = new Builder(((ClientContext) null));\n"
-          + "      builder.setTransportChannelProvider(defaultTransportChannelProvider());\n"
-          + "      builder.setCredentialsProvider(defaultCredentialsProviderBuilder().build());\n"
-          + "     "
-          + " builder.setInternalHeaderProvider(defaultApiClientHeaderProviderBuilder().build());\n"
-          + "      builder.setEndpoint(getDefaultEndpoint());\n"
-          + "      return initDefaults(builder);\n"
-          + "    }\n"
-          + "\n"
-          + "    private static Builder initDefaults(Builder builder) {\n"
-          + "      builder\n"
-          + "          .echoSettings()\n"
-          + "         "
-          + " .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"retry_policy_1_codes\"))\n"
-          + "         "
-          + " .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"retry_policy_1_params\"));\n"
-          + "      builder\n"
-          + "          .expandSettings()\n"
-          + "         "
-          + " .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"retry_policy_1_codes\"))\n"
-          + "         "
-          + " .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"retry_policy_1_params\"));\n"
-          + "      builder\n"
-          + "          .pagedExpandSettings()\n"
-          + "         "
-          + " .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"retry_policy_1_codes\"))\n"
-          + "         "
-          + " .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"retry_policy_1_params\"));\n"
-          + "      builder\n"
-          + "          .waitSettings()\n"
-          + "          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"no_retry_0_codes\"))\n"
-          + "          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"no_retry_0_params\"));\n"
-          + "      builder\n"
-          + "          .blockSettings()\n"
-          + "          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"no_retry_0_codes\"))\n"
-          + "          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"no_retry_0_params\"));\n"
-          + "      builder\n"
-          + "          .waitOperationSettings()\n"
-          + "          .setInitialCallSettings(\n"
-          + "              UnaryCallSettings.<WaitRequest,"
-          + " OperationSnapshot>newUnaryCallSettingsBuilder()\n"
-          + "                 "
-          + " .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"no_retry_0_codes\"))\n"
-          + "                 "
-          + " .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"no_retry_0_params\"))\n"
-          + "                  .build())\n"
-          + "          .setResponseTransformer(\n"
-          + "             "
-          + " ProtoOperationTransformers.ResponseTransformer.create(WaitResponse.class))\n"
-          + "          .setMetadataTransformer(\n"
-          + "             "
-          + " ProtoOperationTransformers.MetadataTransformer.create(WaitMetadata.class))\n"
-          + "          .setPollingAlgorithm(\n"
-          + "              OperationTimedPollAlgorithm.create(\n"
-          + "                  RetrySettings.newBuilder()\n"
-          + "                      .setInitialRetryDelay(Duration.ofMillis(500L))\n"
-          + "                      .setRetryDelayMultiplier(1.5)\n"
-          + "                      .setMaxRetryDelay(Duration.ofMillis(5000L))\n"
-          + "                      .setInitialRpcTimeout(Duration.ZERO)\n"
-          + "                      .setRpcTimeoutMultiplier(1.0)\n"
-          + "                      .setMaxRpcTimeout(Duration.ZERO)\n"
-          + "                      .setTotalTimeout(Duration.ofMillis(300000L))\n"
-          + "                      .build()));\n"
-          + "      return builder;\n"
-          + "    }\n"
-          + "\n"
-          + "    // NEXT_MAJOR_VER: remove 'throws Exception'.\n"
-          + "    /**\n"
-          + "     * Applies the given settings updater function to all of the unary API methods in"
-          + " this service.\n"
-          + "     *\n"
-          + "     * <p>Note: This method does not support applying settings to streaming"
-          + " methods.\n"
-          + "     */\n"
-          + "    public Builder applyToAllUnaryMethods(\n"
-          + "        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) throws"
-          + " Exception {\n"
-          + "      super.applyToAllUnaryMethods(unaryMethodSettingsBuilders, settingsUpdater);\n"
-          + "      return this;\n"
-          + "    }\n"
-          + "\n"
-          + "    public ImmutableList<UnaryCallSettings.Builder<?, ?>>"
-          + " unaryMethodSettingsBuilders() {\n"
-          + "      return unaryMethodSettingsBuilders;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to echo. */\n"
-          + "    public UnaryCallSettings.Builder<EchoRequest, EchoResponse> echoSettings() {\n"
-          + "      return echoSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to expand. */\n"
-          + "    public ServerStreamingCallSettings.Builder<ExpandRequest, EchoResponse>"
-          + " expandSettings() {\n"
-          + "      return expandSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to collect. */\n"
-          + "    public StreamingCallSettings.Builder<EchoRequest, EchoResponse> collectSettings()"
-          + " {\n"
-          + "      return collectSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to chat. */\n"
-          + "    public StreamingCallSettings.Builder<EchoRequest, EchoResponse> chatSettings()"
-          + " {\n"
-          + "      return chatSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to chatAgain. */\n"
-          + "    public StreamingCallSettings.Builder<EchoRequest, EchoResponse>"
-          + " chatAgainSettings() {\n"
-          + "      return chatAgainSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to pagedExpand. */\n"
-          + "    public PagedCallSettings.Builder<\n"
-          + "            PagedExpandRequest, PagedExpandResponse, PagedExpandPagedResponse>\n"
-          + "        pagedExpandSettings() {\n"
-          + "      return pagedExpandSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to wait. */\n"
-          + "    public UnaryCallSettings.Builder<WaitRequest, Operation> waitSettings() {\n"
-          + "      return waitSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to wait. */\n"
-          + "    @BetaApi(\n"
-          + "        \"The surface for use by generated code is not stable yet and may change in"
-          + " the future.\")\n"
-          + "    public OperationCallSettings.Builder<WaitRequest, WaitResponse, WaitMetadata>\n"
-          + "        waitOperationSettings() {\n"
-          + "      return waitOperationSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to block. */\n"
-          + "    public UnaryCallSettings.Builder<BlockRequest, BlockResponse> blockSettings() {\n"
-          + "      return blockSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    @Override\n"
-          + "    public EchoStubSettings build() throws IOException {\n"
-          + "      return new EchoStubSettings(this);\n"
-          + "    }\n"
-          + "  }\n"
-          + "}\n";
-
-  private static final String EXPECTED_LOGGING_STUB_SETTINGS_STRING =
-      "package com.google.logging.v2.stub;\n"
-          + "\n"
-          + "import static"
-          + " com.google.logging.v2.LoggingServiceV2Client.ListLogEntriesPagedResponse;\n"
-          + "import static com.google.logging.v2.LoggingServiceV2Client.ListLogsPagedResponse;\n"
-          + "import static"
-          + " com.google.logging.v2.LoggingServiceV2Client.ListMonitoredResourceDescriptorsPagedResponse;\n"
-          + "\n"
-          + "import com.google.api.MonitoredResourceDescriptor;\n"
-          + "import com.google.api.core.ApiFunction;\n"
-          + "import com.google.api.core.ApiFuture;\n"
-          + "import com.google.api.core.BetaApi;\n"
-          + "import com.google.api.gax.batching.BatchingSettings;\n"
-          + "import com.google.api.gax.batching.FlowControlSettings;\n"
-          + "import com.google.api.gax.batching.FlowController;\n"
-          + "import com.google.api.gax.batching.PartitionKey;\n"
-          + "import com.google.api.gax.batching.RequestBuilder;\n"
-          + "import com.google.api.gax.core.GaxProperties;\n"
-          + "import com.google.api.gax.core.GoogleCredentialsProvider;\n"
-          + "import com.google.api.gax.core.InstantiatingExecutorProvider;\n"
-          + "import com.google.api.gax.grpc.GaxGrpcProperties;\n"
-          + "import com.google.api.gax.grpc.GrpcTransportChannel;\n"
-          + "import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;\n"
-          + "import com.google.api.gax.retrying.RetrySettings;\n"
-          + "import com.google.api.gax.rpc.ApiCallContext;\n"
-          + "import com.google.api.gax.rpc.ApiClientHeaderProvider;\n"
-          + "import com.google.api.gax.rpc.BatchedRequestIssuer;\n"
-          + "import com.google.api.gax.rpc.BatchingCallSettings;\n"
-          + "import com.google.api.gax.rpc.BatchingDescriptor;\n"
-          + "import com.google.api.gax.rpc.ClientContext;\n"
-          + "import com.google.api.gax.rpc.PageContext;\n"
-          + "import com.google.api.gax.rpc.PagedCallSettings;\n"
-          + "import com.google.api.gax.rpc.PagedListDescriptor;\n"
-          + "import com.google.api.gax.rpc.PagedListResponseFactory;\n"
-          + "import com.google.api.gax.rpc.StatusCode;\n"
-          + "import com.google.api.gax.rpc.StubSettings;\n"
-          + "import com.google.api.gax.rpc.TransportChannelProvider;\n"
-          + "import com.google.api.gax.rpc.UnaryCallSettings;\n"
-          + "import com.google.api.gax.rpc.UnaryCallable;\n"
-          + "import com.google.common.collect.ImmutableList;\n"
-          + "import com.google.common.collect.ImmutableMap;\n"
-          + "import com.google.common.collect.ImmutableSet;\n"
-          + "import com.google.common.collect.Lists;\n"
-          + "import com.google.logging.v2.DeleteLogRequest;\n"
-          + "import com.google.logging.v2.ListLogEntriesRequest;\n"
-          + "import com.google.logging.v2.ListLogEntriesResponse;\n"
-          + "import com.google.logging.v2.ListLogsRequest;\n"
-          + "import com.google.logging.v2.ListLogsResponse;\n"
-          + "import com.google.logging.v2.ListMonitoredResourceDescriptorsRequest;\n"
-          + "import com.google.logging.v2.ListMonitoredResourceDescriptorsResponse;\n"
-          + "import com.google.logging.v2.LogEntry;\n"
-          + "import com.google.logging.v2.WriteLogEntriesRequest;\n"
-          + "import com.google.logging.v2.WriteLogEntriesResponse;\n"
-          + "import com.google.protobuf.Empty;\n"
-          + "import java.io.IOException;\n"
-          + "import java.util.Collection;\n"
-          + "import java.util.List;\n"
-          + "import java.util.Objects;\n"
-          + "import javax.annotation.Generated;\n"
-          + "import org.threeten.bp.Duration;\n"
-          + "\n"
-          + "// AUTO-GENERATED DOCUMENTATION AND CLASS.\n"
-          + "/**\n"
-          + " * Settings class to configure an instance of {@link LoggingServiceV2Stub}.\n"
-          + " *\n"
-          + " * <p>The default instance has everything set to sensible defaults:\n"
-          + " *\n"
-          + " * <ul>\n"
-          + " *   <li>The default service address (logging.googleapis.com) and default port (443)"
-          + " are used.\n"
-          + " *   <li>Credentials are acquired automatically through Application Default"
-          + " Credentials.\n"
-          + " *   <li>Retries are configured for idempotent methods but not for non-idempotent"
-          + " methods.\n"
-          + " * </ul>\n"
-          + " *\n"
-          + " * <p>The builder of this class is recursive, so contained classes are themselves"
-          + " builders. When\n"
-          + " * build() is called, the tree of builders is called to create the complete settings"
-          + " object.\n"
-          + " *\n"
-          + " * <p>For example, to set the total timeout of deleteLog to 30 seconds:\n"
-          + " */\n"
-          + "@BetaApi\n"
-          + "@Generated(\"by gapic-generator-java\")\n"
-          + "public class LoggingServiceV2StubSettings extends"
-          + " StubSettings<LoggingServiceV2StubSettings> {\n"
-          + "  /** The default scopes of the service. */\n"
-          + "  private static final ImmutableList<String> DEFAULT_SERVICE_SCOPES =\n"
-          + "      ImmutableList.<String>builder()\n"
-          + "          .add(\"https://www.googleapis.com/auth/cloud-platform\")\n"
-          + "          .add(\"https://www.googleapis.com/auth/cloud-platform.read-only\")\n"
-          + "          .add(\"https://www.googleapis.com/auth/logging.admin\")\n"
-          + "          .add(\"https://www.googleapis.com/auth/logging.read\")\n"
-          + "          .add(\"https://www.googleapis.com/auth/logging.write\")\n"
-          + "          .build();\n"
-          + "\n"
-          + "  private final UnaryCallSettings<DeleteLogRequest, Empty> deleteLogSettings;\n"
-          + "  private final BatchingCallSettings<WriteLogEntriesRequest,"
-          + " WriteLogEntriesResponse>\n"
-          + "      writeLogEntriesSettings;\n"
-          + "  private final PagedCallSettings<\n"
-          + "          ListLogEntriesRequest, ListLogEntriesResponse,"
-          + " ListLogEntriesPagedResponse>\n"
-          + "      listLogEntriesSettings;\n"
-          + "  private final PagedCallSettings<\n"
-          + "          ListMonitoredResourceDescriptorsRequest,\n"
-          + "          ListMonitoredResourceDescriptorsResponse,\n"
-          + "          ListMonitoredResourceDescriptorsPagedResponse>\n"
-          + "      listMonitoredResourceDescriptorsSettings;\n"
-          + "  private final PagedCallSettings<ListLogsRequest, ListLogsResponse,"
-          + " ListLogsPagedResponse>\n"
-          + "      listLogsSettings;\n"
-          + "  private static final PagedListDescriptor<ListLogEntriesRequest,"
-          + " ListLogEntriesResponse, LogEntry>\n"
-          + "      LIST_LOG_ENTRIES_PAGE_STR_DESC =\n"
-          + "          new PagedListDescriptor<ListLogEntriesRequest, ListLogEntriesResponse,"
-          + " LogEntry>() {\n"
-          + "            @Override\n"
-          + "            public String emptyToken() {\n"
-          + "              return \"\";\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public ListLogEntriesRequest injectToken(ListLogEntriesRequest payload,"
-          + " String token) {\n"
-          + "              return"
-          + " ListLogEntriesRequest.newBuilder(payload).setPageToken(token).build();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public ListLogEntriesRequest injectPageSize(\n"
-          + "                ListLogEntriesRequest payload, int pageSize) {\n"
-          + "              return"
-          + " ListLogEntriesRequest.newBuilder(payload).setPageSize(pageSize).build();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public Integer extractPageSize(ListLogEntriesRequest payload) {\n"
-          + "              return payload.getPageSize();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public String extractNextToken(ListLogEntriesResponse payload) {\n"
-          + "              return payload.getNextPageToken();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public Iterable<LogEntry> extractResources(ListLogEntriesResponse"
-          + " payload) {\n"
-          + "              return Objects.isNull(payload.getEntriesList())\n"
-          + "                  ? ImmutableList.<LogEntry>of()\n"
-          + "                  : payload.getEntriesList();\n"
-          + "            }\n"
-          + "          };\n"
-          + "  private static final PagedListDescriptor<\n"
-          + "          ListMonitoredResourceDescriptorsRequest,\n"
-          + "          ListMonitoredResourceDescriptorsResponse,\n"
-          + "          MonitoredResourceDescriptor>\n"
-          + "      LIST_MONITORED_RESOURCE_DESCRIPTORS_PAGE_STR_DESC =\n"
-          + "          new PagedListDescriptor<\n"
-          + "              ListMonitoredResourceDescriptorsRequest,\n"
-          + "              ListMonitoredResourceDescriptorsResponse,\n"
-          + "              MonitoredResourceDescriptor>() {\n"
-          + "            @Override\n"
-          + "            public String emptyToken() {\n"
-          + "              return \"\";\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public ListMonitoredResourceDescriptorsRequest injectToken(\n"
-          + "                ListMonitoredResourceDescriptorsRequest payload, String token) {\n"
-          + "              return ListMonitoredResourceDescriptorsRequest.newBuilder(payload)\n"
-          + "                  .setPageToken(token)\n"
-          + "                  .build();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public ListMonitoredResourceDescriptorsRequest injectPageSize(\n"
-          + "                ListMonitoredResourceDescriptorsRequest payload, int pageSize) {\n"
-          + "              return ListMonitoredResourceDescriptorsRequest.newBuilder(payload)\n"
-          + "                  .setPageSize(pageSize)\n"
-          + "                  .build();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public Integer extractPageSize(ListMonitoredResourceDescriptorsRequest"
-          + " payload) {\n"
-          + "              return payload.getPageSize();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public String extractNextToken(ListMonitoredResourceDescriptorsResponse"
-          + " payload) {\n"
-          + "              return payload.getNextPageToken();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public Iterable<MonitoredResourceDescriptor> extractResources(\n"
-          + "                ListMonitoredResourceDescriptorsResponse payload) {\n"
-          + "              return Objects.isNull(payload.getResourceDescriptorsList())\n"
-          + "                  ? ImmutableList.<MonitoredResourceDescriptor>of()\n"
-          + "                  : payload.getResourceDescriptorsList();\n"
-          + "            }\n"
-          + "          };\n"
-          + "  private static final PagedListDescriptor<ListLogsRequest, ListLogsResponse,"
-          + " String>\n"
-          + "      LIST_LOGS_PAGE_STR_DESC =\n"
-          + "          new PagedListDescriptor<ListLogsRequest, ListLogsResponse, String>() {\n"
-          + "            @Override\n"
-          + "            public String emptyToken() {\n"
-          + "              return \"\";\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public ListLogsRequest injectToken(ListLogsRequest payload, String token)"
-          + " {\n"
-          + "              return"
-          + " ListLogsRequest.newBuilder(payload).setPageToken(token).build();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public ListLogsRequest injectPageSize(ListLogsRequest payload, int"
-          + " pageSize) {\n"
-          + "              return"
-          + " ListLogsRequest.newBuilder(payload).setPageSize(pageSize).build();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public Integer extractPageSize(ListLogsRequest payload) {\n"
-          + "              return payload.getPageSize();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public String extractNextToken(ListLogsResponse payload) {\n"
-          + "              return payload.getNextPageToken();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public Iterable<String> extractResources(ListLogsResponse payload) {\n"
-          + "              return Objects.isNull(payload.getLogNamesList())\n"
-          + "                  ? ImmutableList.<String>of()\n"
-          + "                  : payload.getLogNamesList();\n"
-          + "            }\n"
-          + "          };\n"
-          + "  private static final PagedListResponseFactory<\n"
-          + "          ListLogEntriesRequest, ListLogEntriesResponse,"
-          + " ListLogEntriesPagedResponse>\n"
-          + "      LIST_LOG_ENTRIES_PAGE_STR_FACT =\n"
-          + "          new PagedListResponseFactory<\n"
-          + "              ListLogEntriesRequest, ListLogEntriesResponse,"
-          + " ListLogEntriesPagedResponse>() {\n"
-          + "            @Override\n"
-          + "            public ApiFuture<ListLogEntriesPagedResponse> getFuturePagedResponse(\n"
-          + "                UnaryCallable<ListLogEntriesRequest, ListLogEntriesResponse>"
-          + " callable,\n"
-          + "                ListLogEntriesRequest request,\n"
-          + "                ApiCallContext context,\n"
-          + "                ApiFuture<ListLogEntriesResponse> futureResponse) {\n"
-          + "              PageContext<ListLogEntriesRequest, ListLogEntriesResponse, LogEntry>"
-          + " pageContext =\n"
-          + "                  PageContext.create(callable, LIST_LOG_ENTRIES_PAGE_STR_DESC,"
-          + " request, context);\n"
-          + "              return ListLogEntriesPagedResponse.createAsync(pageContext,"
-          + " futureResponse);\n"
-          + "            }\n"
-          + "          };\n"
-          + "  private static final PagedListResponseFactory<\n"
-          + "          ListMonitoredResourceDescriptorsRequest,\n"
-          + "          ListMonitoredResourceDescriptorsResponse,\n"
-          + "          ListMonitoredResourceDescriptorsPagedResponse>\n"
-          + "      LIST_MONITORED_RESOURCE_DESCRIPTORS_PAGE_STR_FACT =\n"
-          + "          new PagedListResponseFactory<\n"
-          + "              ListMonitoredResourceDescriptorsRequest,\n"
-          + "              ListMonitoredResourceDescriptorsResponse,\n"
-          + "              ListMonitoredResourceDescriptorsPagedResponse>() {\n"
-          + "            @Override\n"
-          + "            public ApiFuture<ListMonitoredResourceDescriptorsPagedResponse>"
-          + " getFuturePagedResponse(\n"
-          + "                UnaryCallable<\n"
-          + "                        ListMonitoredResourceDescriptorsRequest,\n"
-          + "                        ListMonitoredResourceDescriptorsResponse>\n"
-          + "                    callable,\n"
-          + "                ListMonitoredResourceDescriptorsRequest request,\n"
-          + "                ApiCallContext context,\n"
-          + "                ApiFuture<ListMonitoredResourceDescriptorsResponse> futureResponse)"
-          + " {\n"
-          + "              PageContext<\n"
-          + "                      ListMonitoredResourceDescriptorsRequest,\n"
-          + "                      ListMonitoredResourceDescriptorsResponse,\n"
-          + "                      MonitoredResourceDescriptor>\n"
-          + "                  pageContext =\n"
-          + "                      PageContext.create(\n"
-          + "                          callable,\n"
-          + "                          LIST_MONITORED_RESOURCE_DESCRIPTORS_PAGE_STR_DESC,\n"
-          + "                          request,\n"
-          + "                          context);\n"
-          + "              return ListMonitoredResourceDescriptorsPagedResponse.createAsync(\n"
-          + "                  pageContext, futureResponse);\n"
-          + "            }\n"
-          + "          };\n"
-          + "  private static final PagedListResponseFactory<\n"
-          + "          ListLogsRequest, ListLogsResponse, ListLogsPagedResponse>\n"
-          + "      LIST_LOGS_PAGE_STR_FACT =\n"
-          + "          new PagedListResponseFactory<ListLogsRequest, ListLogsResponse,"
-          + " ListLogsPagedResponse>() {\n"
-          + "            @Override\n"
-          + "            public ApiFuture<ListLogsPagedResponse> getFuturePagedResponse(\n"
-          + "                UnaryCallable<ListLogsRequest, ListLogsResponse> callable,\n"
-          + "                ListLogsRequest request,\n"
-          + "                ApiCallContext context,\n"
-          + "                ApiFuture<ListLogsResponse> futureResponse) {\n"
-          + "              PageContext<ListLogsRequest, ListLogsResponse, String> pageContext =\n"
-          + "                  PageContext.create(callable, LIST_LOGS_PAGE_STR_DESC, request,"
-          + " context);\n"
-          + "              return ListLogsPagedResponse.createAsync(pageContext,"
-          + " futureResponse);\n"
-          + "            }\n"
-          + "          };\n"
-          + "  private static final BatchingDescriptor<WriteLogEntriesRequest,"
-          + " WriteLogEntriesResponse>\n"
-          + "      WRITE_LOG_ENTRIES_BATCHING_DESC =\n"
-          + "          new BatchingDescriptor<WriteLogEntriesRequest, WriteLogEntriesResponse>()"
-          + " {\n"
-          + "            @Override\n"
-          + "            public PartitionKey getBatchPartitionKey(WriteLogEntriesRequest request)"
-          + " {\n"
-          + "              return new PartitionKey(\n"
-          + "                  request.getLogName(), request.getResource(),"
-          + " request.getLabels());\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public RequestBuilder<WriteLogEntriesRequest> getRequestBuilder() {\n"
-          + "              return new RequestBuilder<WriteLogEntriesRequest>() {\n"
-          + "                private WriteLogEntriesRequest.Builder builder;\n"
-          + "\n"
-          + "                @Override\n"
-          + "                public void appendRequest(WriteLogEntriesRequest request) {\n"
-          + "                  if (Objects.isNull(builder)) {\n"
-          + "                    builder = request.toBuilder();\n"
-          + "                  } else {\n"
-          + "                    builder.addAllEntries(request.getEntriesList());\n"
-          + "                  }\n"
-          + "                }\n"
-          + "\n"
-          + "                @Override\n"
-          + "                public WriteLogEntriesRequest build() {\n"
-          + "                  return builder.build();\n"
-          + "                }\n"
-          + "              };\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public void splitResponse(\n"
-          + "                WriteLogEntriesResponse batchResponse,\n"
-          + "                Collection<? extends BatchedRequestIssuer<WriteLogEntriesResponse>>"
-          + " batch) {\n"
-          + "              for (BatchedRequestIssuer<WriteLogEntriesResponse> responder : batch)"
-          + " {\n"
-          + "                WriteLogEntriesResponse response ="
-          + " WriteLogEntriesResponse.newBuilder().build();\n"
-          + "                responder.setResponse(response);\n"
-          + "              }\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public void splitException(\n"
-          + "                Throwable throwable,\n"
-          + "                Collection<? extends BatchedRequestIssuer<WriteLogEntriesResponse>>"
-          + " batch) {\n"
-          + "              for (BatchedRequestIssuer<WriteLogEntriesResponse> responder : batch)"
-          + " {\n"
-          + "                responder.setException(throwable);\n"
-          + "              }\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public long countElements(WriteLogEntriesRequest request) {\n"
-          + "              return request.getEntriesCount();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public long countBytes(WriteLogEntriesRequest request) {\n"
-          + "              return request.getSerializedSize();\n"
-          + "            }\n"
-          + "          };\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to deleteLog. */\n"
-          + "  public UnaryCallSettings<DeleteLogRequest, Empty> deleteLogSettings() {\n"
-          + "    return deleteLogSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to writeLogEntries. */\n"
-          + "  public BatchingCallSettings<WriteLogEntriesRequest, WriteLogEntriesResponse>\n"
-          + "      writeLogEntriesSettings() {\n"
-          + "    return writeLogEntriesSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to listLogEntries. */\n"
-          + "  public PagedCallSettings<\n"
-          + "          ListLogEntriesRequest, ListLogEntriesResponse,"
-          + " ListLogEntriesPagedResponse>\n"
-          + "      listLogEntriesSettings() {\n"
-          + "    return listLogEntriesSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to"
-          + " listMonitoredResourceDescriptors. */\n"
-          + "  public PagedCallSettings<\n"
-          + "          ListMonitoredResourceDescriptorsRequest,\n"
-          + "          ListMonitoredResourceDescriptorsResponse,\n"
-          + "          ListMonitoredResourceDescriptorsPagedResponse>\n"
-          + "      listMonitoredResourceDescriptorsSettings() {\n"
-          + "    return listMonitoredResourceDescriptorsSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to listLogs. */\n"
-          + "  public PagedCallSettings<ListLogsRequest, ListLogsResponse,"
-          + " ListLogsPagedResponse>\n"
-          + "      listLogsSettings() {\n"
-          + "    return listLogsSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  @BetaApi(\"A restructuring of stub classes is planned, so this may break in the"
-          + " future\")\n"
-          + "  public LoggingServiceV2Stub createStub() throws IOException {\n"
-          + "    if (getTransportChannelProvider()\n"
-          + "        .getTransportName()\n"
-          + "        .equals(GrpcTransportChannel.getGrpcTransportName())) {\n"
-          + "      return GrpcLoggingServiceV2Stub.create(this);\n"
-          + "    }\n"
-          + "    throw new UnsupportedOperationException(\n"
-          + "        String.format(\n"
-          + "            \"Transport not supported: %s\","
-          + " getTransportChannelProvider().getTransportName()));\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a builder for the default ExecutorProvider for this service. */\n"
-          + "  public static InstantiatingExecutorProvider.Builder"
-          + " defaultExecutorProviderBuilder() {\n"
-          + "    return InstantiatingExecutorProvider.newBuilder();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the default service endpoint. */\n"
-          + "  public static String getDefaultEndpoint() {\n"
-          + "    return \"logging.googleapis.com:443\";\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the default service scopes. */\n"
-          + "  public static List<String> getDefaultServiceScopes() {\n"
-          + "    return DEFAULT_SERVICE_SCOPES;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a builder for the default credentials for this service. */\n"
-          + "  public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilder()"
-          + " {\n"
-          + "    return"
-          + " GoogleCredentialsProvider.newBuilder().setScopesToApply(DEFAULT_SERVICE_SCOPES);\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a builder for the default ChannelProvider for this service. */\n"
-          + "  public static InstantiatingGrpcChannelProvider.Builder"
-          + " defaultGrpcTransportProviderBuilder() {\n"
-          + "    return InstantiatingGrpcChannelProvider.newBuilder()\n"
-          + "        .setMaxInboundMessageSize(Integer.MAX_VALUE);\n"
-          + "  }\n"
-          + "\n"
-          + "  public static TransportChannelProvider defaultTransportChannelProvider() {\n"
-          + "    return defaultGrpcTransportProviderBuilder().build();\n"
-          + "  }\n"
-          + "\n"
-          + "  @BetaApi(\"The surface for customizing headers is not stable yet and may change in"
-          + " the future.\")\n"
-          + "  public static ApiClientHeaderProvider.Builder"
-          + " defaultApiClientHeaderProviderBuilder() {\n"
-          + "    return ApiClientHeaderProvider.newBuilder()\n"
-          + "        .setGeneratedLibToken(\n"
-          + "            \"gapic\","
-          + " GaxProperties.getLibraryVersion(LoggingServiceV2StubSettings.class))\n"
-          + "        .setTransportToken(\n"
-          + "            GaxGrpcProperties.getGrpcTokenName(),"
-          + " GaxGrpcProperties.getGrpcVersion());\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a new builder for this class. */\n"
-          + "  public static Builder newBuilder() {\n"
-          + "    return Builder.createDefault();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a new builder for this class. */\n"
-          + "  public static Builder newBuilder(ClientContext clientContext) {\n"
-          + "    return new Builder(clientContext);\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a builder containing all the values of this settings class. */\n"
-          + "  public Builder toBuilder() {\n"
-          + "    return new Builder(this);\n"
-          + "  }\n"
-          + "\n"
-          + "  protected LoggingServiceV2StubSettings(Builder settingsBuilder) throws IOException"
-          + " {\n"
-          + "    super(settingsBuilder);\n"
-          + "    deleteLogSettings = settingsBuilder.deleteLogSettings().build();\n"
-          + "    writeLogEntriesSettings = settingsBuilder.writeLogEntriesSettings().build();\n"
-          + "    listLogEntriesSettings = settingsBuilder.listLogEntriesSettings().build();\n"
-          + "    listMonitoredResourceDescriptorsSettings =\n"
-          + "        settingsBuilder.listMonitoredResourceDescriptorsSettings().build();\n"
-          + "    listLogsSettings = settingsBuilder.listLogsSettings().build();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Builder for LoggingServiceV2StubSettings. */\n"
-          + "  public static class Builder extends"
-          + " StubSettings.Builder<LoggingServiceV2StubSettings, Builder> {\n"
-          + "    private final ImmutableList<UnaryCallSettings.Builder<?, ?>>"
-          + " unaryMethodSettingsBuilders;\n"
-          + "    private final UnaryCallSettings.Builder<DeleteLogRequest, Empty>"
-          + " deleteLogSettings;\n"
-          + "    private final BatchingCallSettings.Builder<WriteLogEntriesRequest,"
-          + " WriteLogEntriesResponse>\n"
-          + "        writeLogEntriesSettings;\n"
-          + "    private final PagedCallSettings.Builder<\n"
-          + "            ListLogEntriesRequest, ListLogEntriesResponse,"
-          + " ListLogEntriesPagedResponse>\n"
-          + "        listLogEntriesSettings;\n"
-          + "    private final PagedCallSettings.Builder<\n"
-          + "            ListMonitoredResourceDescriptorsRequest,\n"
-          + "            ListMonitoredResourceDescriptorsResponse,\n"
-          + "            ListMonitoredResourceDescriptorsPagedResponse>\n"
-          + "        listMonitoredResourceDescriptorsSettings;\n"
-          + "    private final PagedCallSettings.Builder<\n"
-          + "            ListLogsRequest, ListLogsResponse, ListLogsPagedResponse>\n"
-          + "        listLogsSettings;\n"
-          + "    private static final ImmutableMap<String, ImmutableSet<StatusCode.Code>>\n"
-          + "        RETRYABLE_CODE_DEFINITIONS;\n"
-          + "\n"
-          + "    static {\n"
-          + "      ImmutableMap.Builder<String, ImmutableSet<StatusCode.Code>> definitions =\n"
-          + "          ImmutableMap.builder();\n"
-          + "      definitions.put(\n"
-          + "          \"retry_policy_1_codes\",\n"
-          + "          ImmutableSet.copyOf(\n"
-          + "              Lists.<StatusCode.Code>newArrayList(\n"
-          + "                  StatusCode.Code.DEADLINE_EXCEEDED,\n"
-          + "                  StatusCode.Code.INTERNAL,\n"
-          + "                  StatusCode.Code.UNAVAILABLE)));\n"
-          + "      RETRYABLE_CODE_DEFINITIONS = definitions.build();\n"
-          + "    }\n"
-          + "\n"
-          + "    private static final ImmutableMap<String, RetrySettings>"
-          + " RETRY_PARAM_DEFINITIONS;\n"
-          + "\n"
-          + "    static {\n"
-          + "      ImmutableMap.Builder<String, RetrySettings> definitions ="
-          + " ImmutableMap.builder();\n"
-          + "      RetrySettings settings = null;\n"
-          + "      settings =\n"
-          + "          RetrySettings.newBuilder()\n"
-          + "              .setInitialRetryDelay(Duration.ofMillis(100L))\n"
-          + "              .setRetryDelayMultiplier(1.3)\n"
-          + "              .setMaxRetryDelay(Duration.ofMillis(60000L))\n"
-          + "              .setInitialRpcTimeout(Duration.ofMillis(60000L))\n"
-          + "              .setRpcTimeoutMultiplier(1.0)\n"
-          + "              .setMaxRpcTimeout(Duration.ofMillis(60000L))\n"
-          + "              .setTotalTimeout(Duration.ofMillis(60000L))\n"
-          + "              .build();\n"
-          + "      definitions.put(\"retry_policy_1_params\", settings);\n"
-          + "      RETRY_PARAM_DEFINITIONS = definitions.build();\n"
-          + "    }\n"
-          + "\n"
-          + "    protected Builder() {\n"
-          + "      this(((ClientContext) null));\n"
-          + "    }\n"
-          + "\n"
-          + "    protected Builder(ClientContext clientContext) {\n"
-          + "      super(clientContext);\n"
-          + "      deleteLogSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();\n"
-          + "      writeLogEntriesSettings =\n"
-          + "          BatchingCallSettings.newBuilder(WRITE_LOG_ENTRIES_BATCHING_DESC)\n"
-          + "              .setBatchingSettings(BatchingSettings.newBuilder().build());\n"
-          + "      listLogEntriesSettings ="
-          + " PagedCallSettings.newBuilder(LIST_LOG_ENTRIES_PAGE_STR_FACT);\n"
-          + "      listMonitoredResourceDescriptorsSettings =\n"
-          + "         "
-          + " PagedCallSettings.newBuilder(LIST_MONITORED_RESOURCE_DESCRIPTORS_PAGE_STR_FACT);\n"
-          + "      listLogsSettings = PagedCallSettings.newBuilder(LIST_LOGS_PAGE_STR_FACT);\n"
-          + "      unaryMethodSettingsBuilders =\n"
-          + "          ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(\n"
-          + "              deleteLogSettings,\n"
-          + "              writeLogEntriesSettings,\n"
-          + "              listLogEntriesSettings,\n"
-          + "              listMonitoredResourceDescriptorsSettings,\n"
-          + "              listLogsSettings);\n"
-          + "      initDefaults(this);\n"
-          + "    }\n"
-          + "\n"
-          + "    protected Builder(LoggingServiceV2StubSettings settings) {\n"
-          + "      super(settings);\n"
-          + "      deleteLogSettings = settings.deleteLogSettings.toBuilder();\n"
-          + "      writeLogEntriesSettings = settings.writeLogEntriesSettings.toBuilder();\n"
-          + "      listLogEntriesSettings = settings.listLogEntriesSettings.toBuilder();\n"
-          + "      listMonitoredResourceDescriptorsSettings =\n"
-          + "          settings.listMonitoredResourceDescriptorsSettings.toBuilder();\n"
-          + "      listLogsSettings = settings.listLogsSettings.toBuilder();\n"
-          + "      unaryMethodSettingsBuilders =\n"
-          + "          ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(\n"
-          + "              deleteLogSettings,\n"
-          + "              writeLogEntriesSettings,\n"
-          + "              listLogEntriesSettings,\n"
-          + "              listMonitoredResourceDescriptorsSettings,\n"
-          + "              listLogsSettings);\n"
-          + "    }\n"
-          + "\n"
-          + "    private static Builder createDefault() {\n"
-          + "      Builder builder = new Builder(((ClientContext) null));\n"
-          + "      builder.setTransportChannelProvider(defaultTransportChannelProvider());\n"
-          + "      builder.setCredentialsProvider(defaultCredentialsProviderBuilder().build());\n"
-          + "     "
-          + " builder.setInternalHeaderProvider(defaultApiClientHeaderProviderBuilder().build());\n"
-          + "      builder.setEndpoint(getDefaultEndpoint());\n"
-          + "      return initDefaults(builder);\n"
-          + "    }\n"
-          + "\n"
-          + "    private static Builder initDefaults(Builder builder) {\n"
-          + "      builder\n"
-          + "          .deleteLogSettings()\n"
-          + "         "
-          + " .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"retry_policy_1_codes\"))\n"
-          + "         "
-          + " .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"retry_policy_1_params\"));\n"
-          + "      builder\n"
-          + "          .writeLogEntriesSettings()\n"
-          + "          .setBatchingSettings(\n"
-          + "              BatchingSettings.newBuilder()\n"
-          + "                  .setElementCountThreshold(1000L)\n"
-          + "                  .setRequestByteThreshold(1048576L)\n"
-          + "                  .setDelayThreshold(Duration.ofMillis(50L))\n"
-          + "                  .setFlowControlSettings(\n"
-          + "                      FlowControlSettings.newBuilder()\n"
-          + "                          .setMaxOutstandingElementCount(100000L)\n"
-          + "                          .setMaxOutstandingRequestBytes(10485760L)\n"
-          + "                          .setLimitExceededBehavior(\n"
-          + "                              FlowController.LimitExceededBehavior.ThrowException)\n"
-          + "                          .build())\n"
-          + "                  .build());\n"
-          + "      builder\n"
-          + "          .writeLogEntriesSettings()\n"
-          + "         "
-          + " .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"retry_policy_1_codes\"))\n"
-          + "         "
-          + " .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"retry_policy_1_params\"));\n"
-          + "      builder\n"
-          + "          .listLogEntriesSettings()\n"
-          + "         "
-          + " .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"retry_policy_1_codes\"))\n"
-          + "         "
-          + " .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"retry_policy_1_params\"));\n"
-          + "      builder\n"
-          + "          .listMonitoredResourceDescriptorsSettings()\n"
-          + "         "
-          + " .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"retry_policy_1_codes\"))\n"
-          + "         "
-          + " .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"retry_policy_1_params\"));\n"
-          + "      builder\n"
-          + "          .listLogsSettings()\n"
-          + "         "
-          + " .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"retry_policy_1_codes\"))\n"
-          + "         "
-          + " .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"retry_policy_1_params\"));\n"
-          + "      return builder;\n"
-          + "    }\n"
-          + "\n"
-          + "    // NEXT_MAJOR_VER: remove 'throws Exception'.\n"
-          + "    /**\n"
-          + "     * Applies the given settings updater function to all of the unary API methods in"
-          + " this service.\n"
-          + "     *\n"
-          + "     * <p>Note: This method does not support applying settings to streaming"
-          + " methods.\n"
-          + "     */\n"
-          + "    public Builder applyToAllUnaryMethods(\n"
-          + "        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) throws"
-          + " Exception {\n"
-          + "      super.applyToAllUnaryMethods(unaryMethodSettingsBuilders, settingsUpdater);\n"
-          + "      return this;\n"
-          + "    }\n"
-          + "\n"
-          + "    public ImmutableList<UnaryCallSettings.Builder<?, ?>>"
-          + " unaryMethodSettingsBuilders() {\n"
-          + "      return unaryMethodSettingsBuilders;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to deleteLog. */\n"
-          + "    public UnaryCallSettings.Builder<DeleteLogRequest, Empty> deleteLogSettings() {\n"
-          + "      return deleteLogSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to writeLogEntries. */\n"
-          + "    public BatchingCallSettings.Builder<WriteLogEntriesRequest,"
-          + " WriteLogEntriesResponse>\n"
-          + "        writeLogEntriesSettings() {\n"
-          + "      return writeLogEntriesSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to listLogEntries. */\n"
-          + "    public PagedCallSettings.Builder<\n"
-          + "            ListLogEntriesRequest, ListLogEntriesResponse,"
-          + " ListLogEntriesPagedResponse>\n"
-          + "        listLogEntriesSettings() {\n"
-          + "      return listLogEntriesSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to"
-          + " listMonitoredResourceDescriptors. */\n"
-          + "    public PagedCallSettings.Builder<\n"
-          + "            ListMonitoredResourceDescriptorsRequest,\n"
-          + "            ListMonitoredResourceDescriptorsResponse,\n"
-          + "            ListMonitoredResourceDescriptorsPagedResponse>\n"
-          + "        listMonitoredResourceDescriptorsSettings() {\n"
-          + "      return listMonitoredResourceDescriptorsSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to listLogs. */\n"
-          + "    public PagedCallSettings.Builder<ListLogsRequest, ListLogsResponse,"
-          + " ListLogsPagedResponse>\n"
-          + "        listLogsSettings() {\n"
-          + "      return listLogsSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    @Override\n"
-          + "    public LoggingServiceV2StubSettings build() throws IOException {\n"
-          + "      return new LoggingServiceV2StubSettings(this);\n"
-          + "    }\n"
-          + "  }\n"
-          + "}\n";
-
-  private static final String EXPECTED_PUBLISHER_STUB_SETTINGS_STRING =
-      "package com.google.pubsub.v1.stub;\n"
-          + "\n"
-          + "import static com.google.pubsub.v1.PublisherClient.ListTopicSnapshotsPagedResponse;\n"
-          + "import static"
-          + " com.google.pubsub.v1.PublisherClient.ListTopicSubscriptionsPagedResponse;\n"
-          + "import static com.google.pubsub.v1.PublisherClient.ListTopicsPagedResponse;\n"
-          + "\n"
-          + "import com.google.api.core.ApiFunction;\n"
-          + "import com.google.api.core.ApiFuture;\n"
-          + "import com.google.api.core.BetaApi;\n"
-          + "import com.google.api.gax.batching.BatchingSettings;\n"
-          + "import com.google.api.gax.batching.FlowControlSettings;\n"
-          + "import com.google.api.gax.batching.FlowController;\n"
-          + "import com.google.api.gax.batching.PartitionKey;\n"
-          + "import com.google.api.gax.batching.RequestBuilder;\n"
-          + "import com.google.api.gax.core.GaxProperties;\n"
-          + "import com.google.api.gax.core.GoogleCredentialsProvider;\n"
-          + "import com.google.api.gax.core.InstantiatingExecutorProvider;\n"
-          + "import com.google.api.gax.grpc.GaxGrpcProperties;\n"
-          + "import com.google.api.gax.grpc.GrpcTransportChannel;\n"
-          + "import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;\n"
-          + "import com.google.api.gax.retrying.RetrySettings;\n"
-          + "import com.google.api.gax.rpc.ApiCallContext;\n"
-          + "import com.google.api.gax.rpc.ApiClientHeaderProvider;\n"
-          + "import com.google.api.gax.rpc.BatchedRequestIssuer;\n"
-          + "import com.google.api.gax.rpc.BatchingCallSettings;\n"
-          + "import com.google.api.gax.rpc.BatchingDescriptor;\n"
-          + "import com.google.api.gax.rpc.ClientContext;\n"
-          + "import com.google.api.gax.rpc.PageContext;\n"
-          + "import com.google.api.gax.rpc.PagedCallSettings;\n"
-          + "import com.google.api.gax.rpc.PagedListDescriptor;\n"
-          + "import com.google.api.gax.rpc.PagedListResponseFactory;\n"
-          + "import com.google.api.gax.rpc.StatusCode;\n"
-          + "import com.google.api.gax.rpc.StubSettings;\n"
-          + "import com.google.api.gax.rpc.TransportChannelProvider;\n"
-          + "import com.google.api.gax.rpc.UnaryCallSettings;\n"
-          + "import com.google.api.gax.rpc.UnaryCallable;\n"
-          + "import com.google.common.collect.ImmutableList;\n"
-          + "import com.google.common.collect.ImmutableMap;\n"
-          + "import com.google.common.collect.ImmutableSet;\n"
-          + "import com.google.common.collect.Lists;\n"
-          + "import com.google.protobuf.Empty;\n"
-          + "import com.google.pubsub.v1.DeleteTopicRequest;\n"
-          + "import com.google.pubsub.v1.DetachSubscriptionRequest;\n"
-          + "import com.google.pubsub.v1.DetachSubscriptionResponse;\n"
-          + "import com.google.pubsub.v1.GetTopicRequest;\n"
-          + "import com.google.pubsub.v1.ListTopicSnapshotsRequest;\n"
-          + "import com.google.pubsub.v1.ListTopicSnapshotsResponse;\n"
-          + "import com.google.pubsub.v1.ListTopicSubscriptionsRequest;\n"
-          + "import com.google.pubsub.v1.ListTopicSubscriptionsResponse;\n"
-          + "import com.google.pubsub.v1.ListTopicsRequest;\n"
-          + "import com.google.pubsub.v1.ListTopicsResponse;\n"
-          + "import com.google.pubsub.v1.PublishRequest;\n"
-          + "import com.google.pubsub.v1.PublishResponse;\n"
-          + "import com.google.pubsub.v1.Topic;\n"
-          + "import com.google.pubsub.v1.UpdateTopicRequest;\n"
-          + "import java.io.IOException;\n"
-          + "import java.util.ArrayList;\n"
-          + "import java.util.Collection;\n"
-          + "import java.util.List;\n"
-          + "import java.util.Objects;\n"
-          + "import javax.annotation.Generated;\n"
-          + "import org.threeten.bp.Duration;\n"
-          + "\n"
-          + "// AUTO-GENERATED DOCUMENTATION AND CLASS.\n"
-          + "/**\n"
-          + " * Settings class to configure an instance of {@link PublisherStub}.\n"
-          + " *\n"
-          + " * <p>The default instance has everything set to sensible defaults:\n"
-          + " *\n"
-          + " * <ul>\n"
-          + " *   <li>The default service address (pubsub.googleapis.com) and default port (443)"
-          + " are used.\n"
-          + " *   <li>Credentials are acquired automatically through Application Default"
-          + " Credentials.\n"
-          + " *   <li>Retries are configured for idempotent methods but not for non-idempotent"
-          + " methods.\n"
-          + " * </ul>\n"
-          + " *\n"
-          + " * <p>The builder of this class is recursive, so contained classes are themselves"
-          + " builders. When\n"
-          + " * build() is called, the tree of builders is called to create the complete settings"
-          + " object.\n"
-          + " *\n"
-          + " * <p>For example, to set the total timeout of createTopic to 30 seconds:\n"
-          + " */\n"
-          + "@BetaApi\n"
-          + "@Generated(\"by gapic-generator-java\")\n"
-          + "public class PublisherStubSettings extends StubSettings<PublisherStubSettings> {\n"
-          + "  /** The default scopes of the service. */\n"
-          + "  private static final ImmutableList<String> DEFAULT_SERVICE_SCOPES =\n"
-          + "      ImmutableList.<String>builder()\n"
-          + "          .add(\"https://www.googleapis.com/auth/cloud-platform\")\n"
-          + "          .add(\"https://www.googleapis.com/auth/pubsub\")\n"
-          + "          .build();\n"
-          + "\n"
-          + "  private final UnaryCallSettings<Topic, Topic> createTopicSettings;\n"
-          + "  private final UnaryCallSettings<UpdateTopicRequest, Topic> updateTopicSettings;\n"
-          + "  private final BatchingCallSettings<PublishRequest, PublishResponse>"
-          + " publishSettings;\n"
-          + "  private final UnaryCallSettings<GetTopicRequest, Topic> getTopicSettings;\n"
-          + "  private final PagedCallSettings<ListTopicsRequest, ListTopicsResponse,"
-          + " ListTopicsPagedResponse>\n"
-          + "      listTopicsSettings;\n"
-          + "  private final PagedCallSettings<\n"
-          + "          ListTopicSubscriptionsRequest,\n"
-          + "          ListTopicSubscriptionsResponse,\n"
-          + "          ListTopicSubscriptionsPagedResponse>\n"
-          + "      listTopicSubscriptionsSettings;\n"
-          + "  private final PagedCallSettings<\n"
-          + "          ListTopicSnapshotsRequest, ListTopicSnapshotsResponse,"
-          + " ListTopicSnapshotsPagedResponse>\n"
-          + "      listTopicSnapshotsSettings;\n"
-          + "  private final UnaryCallSettings<DeleteTopicRequest, Empty> deleteTopicSettings;\n"
-          + "  private final UnaryCallSettings<DetachSubscriptionRequest,"
-          + " DetachSubscriptionResponse>\n"
-          + "      detachSubscriptionSettings;\n"
-          + "  private static final PagedListDescriptor<ListTopicsRequest, ListTopicsResponse,"
-          + " Topic>\n"
-          + "      LIST_TOPICS_PAGE_STR_DESC =\n"
-          + "          new PagedListDescriptor<ListTopicsRequest, ListTopicsResponse, Topic>() {\n"
-          + "            @Override\n"
-          + "            public String emptyToken() {\n"
-          + "              return \"\";\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public ListTopicsRequest injectToken(ListTopicsRequest payload, String"
-          + " token) {\n"
-          + "              return"
-          + " ListTopicsRequest.newBuilder(payload).setPageToken(token).build();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public ListTopicsRequest injectPageSize(ListTopicsRequest payload, int"
-          + " pageSize) {\n"
-          + "              return"
-          + " ListTopicsRequest.newBuilder(payload).setPageSize(pageSize).build();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public Integer extractPageSize(ListTopicsRequest payload) {\n"
-          + "              return payload.getPageSize();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public String extractNextToken(ListTopicsResponse payload) {\n"
-          + "              return payload.getNextPageToken();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public Iterable<Topic> extractResources(ListTopicsResponse payload) {\n"
-          + "              return Objects.isNull(payload.getTopicsList())\n"
-          + "                  ? ImmutableList.<Topic>of()\n"
-          + "                  : payload.getTopicsList();\n"
-          + "            }\n"
-          + "          };\n"
-          + "  private static final PagedListDescriptor<\n"
-          + "          ListTopicSubscriptionsRequest, ListTopicSubscriptionsResponse, String>\n"
-          + "      LIST_TOPIC_SUBSCRIPTIONS_PAGE_STR_DESC =\n"
-          + "          new PagedListDescriptor<\n"
-          + "              ListTopicSubscriptionsRequest, ListTopicSubscriptionsResponse,"
-          + " String>() {\n"
-          + "            @Override\n"
-          + "            public String emptyToken() {\n"
-          + "              return \"\";\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public ListTopicSubscriptionsRequest injectToken(\n"
-          + "                ListTopicSubscriptionsRequest payload, String token) {\n"
-          + "              return"
-          + " ListTopicSubscriptionsRequest.newBuilder(payload).setPageToken(token).build();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public ListTopicSubscriptionsRequest injectPageSize(\n"
-          + "                ListTopicSubscriptionsRequest payload, int pageSize) {\n"
-          + "              return ListTopicSubscriptionsRequest.newBuilder(payload)\n"
-          + "                  .setPageSize(pageSize)\n"
-          + "                  .build();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public Integer extractPageSize(ListTopicSubscriptionsRequest payload) {\n"
-          + "              return payload.getPageSize();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public String extractNextToken(ListTopicSubscriptionsResponse payload)"
-          + " {\n"
-          + "              return payload.getNextPageToken();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public Iterable<String> extractResources(ListTopicSubscriptionsResponse"
-          + " payload) {\n"
-          + "              return Objects.isNull(payload.getSubscriptionsList())\n"
-          + "                  ? ImmutableList.<String>of()\n"
-          + "                  : payload.getSubscriptionsList();\n"
-          + "            }\n"
-          + "          };\n"
-          + "  private static final PagedListDescriptor<\n"
-          + "          ListTopicSnapshotsRequest, ListTopicSnapshotsResponse, String>\n"
-          + "      LIST_TOPIC_SNAPSHOTS_PAGE_STR_DESC =\n"
-          + "          new PagedListDescriptor<ListTopicSnapshotsRequest,"
-          + " ListTopicSnapshotsResponse, String>() {\n"
-          + "            @Override\n"
-          + "            public String emptyToken() {\n"
-          + "              return \"\";\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public ListTopicSnapshotsRequest injectToken(\n"
-          + "                ListTopicSnapshotsRequest payload, String token) {\n"
-          + "              return"
-          + " ListTopicSnapshotsRequest.newBuilder(payload).setPageToken(token).build();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public ListTopicSnapshotsRequest injectPageSize(\n"
-          + "                ListTopicSnapshotsRequest payload, int pageSize) {\n"
-          + "              return"
-          + " ListTopicSnapshotsRequest.newBuilder(payload).setPageSize(pageSize).build();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public Integer extractPageSize(ListTopicSnapshotsRequest payload) {\n"
-          + "              return payload.getPageSize();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public String extractNextToken(ListTopicSnapshotsResponse payload) {\n"
-          + "              return payload.getNextPageToken();\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public Iterable<String> extractResources(ListTopicSnapshotsResponse"
-          + " payload) {\n"
-          + "              return Objects.isNull(payload.getSnapshotsList())\n"
-          + "                  ? ImmutableList.<String>of()\n"
-          + "                  : payload.getSnapshotsList();\n"
-          + "            }\n"
-          + "          };\n"
-          + "  private static final PagedListResponseFactory<\n"
-          + "          ListTopicsRequest, ListTopicsResponse, ListTopicsPagedResponse>\n"
-          + "      LIST_TOPICS_PAGE_STR_FACT =\n"
-          + "          new PagedListResponseFactory<\n"
-          + "              ListTopicsRequest, ListTopicsResponse, ListTopicsPagedResponse>() {\n"
-          + "            @Override\n"
-          + "            public ApiFuture<ListTopicsPagedResponse> getFuturePagedResponse(\n"
-          + "                UnaryCallable<ListTopicsRequest, ListTopicsResponse> callable,\n"
-          + "                ListTopicsRequest request,\n"
-          + "                ApiCallContext context,\n"
-          + "                ApiFuture<ListTopicsResponse> futureResponse) {\n"
-          + "              PageContext<ListTopicsRequest, ListTopicsResponse, Topic> pageContext"
-          + " =\n"
-          + "                  PageContext.create(callable, LIST_TOPICS_PAGE_STR_DESC, request,"
-          + " context);\n"
-          + "              return ListTopicsPagedResponse.createAsync(pageContext,"
-          + " futureResponse);\n"
-          + "            }\n"
-          + "          };\n"
-          + "  private static final PagedListResponseFactory<\n"
-          + "          ListTopicSubscriptionsRequest,\n"
-          + "          ListTopicSubscriptionsResponse,\n"
-          + "          ListTopicSubscriptionsPagedResponse>\n"
-          + "      LIST_TOPIC_SUBSCRIPTIONS_PAGE_STR_FACT =\n"
-          + "          new PagedListResponseFactory<\n"
-          + "              ListTopicSubscriptionsRequest,\n"
-          + "              ListTopicSubscriptionsResponse,\n"
-          + "              ListTopicSubscriptionsPagedResponse>() {\n"
-          + "            @Override\n"
-          + "            public ApiFuture<ListTopicSubscriptionsPagedResponse>"
-          + " getFuturePagedResponse(\n"
-          + "                UnaryCallable<ListTopicSubscriptionsRequest,"
-          + " ListTopicSubscriptionsResponse>\n"
-          + "                    callable,\n"
-          + "                ListTopicSubscriptionsRequest request,\n"
-          + "                ApiCallContext context,\n"
-          + "                ApiFuture<ListTopicSubscriptionsResponse> futureResponse) {\n"
-          + "              PageContext<ListTopicSubscriptionsRequest,"
-          + " ListTopicSubscriptionsResponse, String>\n"
-          + "                  pageContext =\n"
-          + "                      PageContext.create(\n"
-          + "                          callable, LIST_TOPIC_SUBSCRIPTIONS_PAGE_STR_DESC, request,"
-          + " context);\n"
-          + "              return ListTopicSubscriptionsPagedResponse.createAsync(pageContext,"
-          + " futureResponse);\n"
-          + "            }\n"
-          + "          };\n"
-          + "  private static final PagedListResponseFactory<\n"
-          + "          ListTopicSnapshotsRequest, ListTopicSnapshotsResponse,"
-          + " ListTopicSnapshotsPagedResponse>\n"
-          + "      LIST_TOPIC_SNAPSHOTS_PAGE_STR_FACT =\n"
-          + "          new PagedListResponseFactory<\n"
-          + "              ListTopicSnapshotsRequest,\n"
-          + "              ListTopicSnapshotsResponse,\n"
-          + "              ListTopicSnapshotsPagedResponse>() {\n"
-          + "            @Override\n"
-          + "            public ApiFuture<ListTopicSnapshotsPagedResponse>"
-          + " getFuturePagedResponse(\n"
-          + "                UnaryCallable<ListTopicSnapshotsRequest, ListTopicSnapshotsResponse>"
-          + " callable,\n"
-          + "                ListTopicSnapshotsRequest request,\n"
-          + "                ApiCallContext context,\n"
-          + "                ApiFuture<ListTopicSnapshotsResponse> futureResponse) {\n"
-          + "              PageContext<ListTopicSnapshotsRequest, ListTopicSnapshotsResponse,"
-          + " String>\n"
-          + "                  pageContext =\n"
-          + "                      PageContext.create(\n"
-          + "                          callable, LIST_TOPIC_SNAPSHOTS_PAGE_STR_DESC, request,"
-          + " context);\n"
-          + "              return ListTopicSnapshotsPagedResponse.createAsync(pageContext,"
-          + " futureResponse);\n"
-          + "            }\n"
-          + "          };\n"
-          + "  private static final BatchingDescriptor<PublishRequest, PublishResponse>"
-          + " PUBLISH_BATCHING_DESC =\n"
-          + "      new BatchingDescriptor<PublishRequest, PublishResponse>() {\n"
-          + "        @Override\n"
-          + "        public PartitionKey getBatchPartitionKey(PublishRequest request) {\n"
-          + "          return new PartitionKey(request.getTopic());\n"
-          + "        }\n"
-          + "\n"
-          + "        @Override\n"
-          + "        public RequestBuilder<PublishRequest> getRequestBuilder() {\n"
-          + "          return new RequestBuilder<PublishRequest>() {\n"
-          + "            private PublishRequest.Builder builder;\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public void appendRequest(PublishRequest request) {\n"
-          + "              if (Objects.isNull(builder)) {\n"
-          + "                builder = request.toBuilder();\n"
-          + "              } else {\n"
-          + "                builder.addAllMessages(request.getMessagesList());\n"
-          + "              }\n"
-          + "            }\n"
-          + "\n"
-          + "            @Override\n"
-          + "            public PublishRequest build() {\n"
-          + "              return builder.build();\n"
-          + "            }\n"
-          + "          };\n"
-          + "        }\n"
-          + "\n"
-          + "        @Override\n"
-          + "        public void splitResponse(\n"
-          + "            PublishResponse batchResponse,\n"
-          + "            Collection<? extends BatchedRequestIssuer<PublishResponse>> batch) {\n"
-          + "          int batchMessageIndex = 0;\n"
-          + "          for (BatchedRequestIssuer<PublishResponse> responder : batch) {\n"
-          + "            List<String> subresponseElements = new ArrayList<>();\n"
-          + "            long subresponseCount = responder.getMessageCount();\n"
-          + "            for (int i = 0; i < subresponseCount; i++) {\n"
-          + "             "
-          + " subresponseElements.add(batchResponse.getMessageIds(batchMessageIndex++));\n"
-          + "            }\n"
-          + "            PublishResponse response =\n"
-          + "               "
-          + " PublishResponse.newBuilder().addAllMessageIds(subresponseElements).build();\n"
-          + "            responder.setResponse(response);\n"
-          + "          }\n"
-          + "        }\n"
-          + "\n"
-          + "        @Override\n"
-          + "        public void splitException(\n"
-          + "            Throwable throwable,\n"
-          + "            Collection<? extends BatchedRequestIssuer<PublishResponse>> batch) {\n"
-          + "          for (BatchedRequestIssuer<PublishResponse> responder : batch) {\n"
-          + "            responder.setException(throwable);\n"
-          + "          }\n"
-          + "        }\n"
-          + "\n"
-          + "        @Override\n"
-          + "        public long countElements(PublishRequest request) {\n"
-          + "          return request.getMessagesCount();\n"
-          + "        }\n"
-          + "\n"
-          + "        @Override\n"
-          + "        public long countBytes(PublishRequest request) {\n"
-          + "          return request.getSerializedSize();\n"
-          + "        }\n"
-          + "      };\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to createTopic. */\n"
-          + "  public UnaryCallSettings<Topic, Topic> createTopicSettings() {\n"
-          + "    return createTopicSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to updateTopic. */\n"
-          + "  public UnaryCallSettings<UpdateTopicRequest, Topic> updateTopicSettings() {\n"
-          + "    return updateTopicSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to publish. */\n"
-          + "  public BatchingCallSettings<PublishRequest, PublishResponse> publishSettings() {\n"
-          + "    return publishSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to getTopic. */\n"
-          + "  public UnaryCallSettings<GetTopicRequest, Topic> getTopicSettings() {\n"
-          + "    return getTopicSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to listTopics. */\n"
-          + "  public PagedCallSettings<ListTopicsRequest, ListTopicsResponse,"
-          + " ListTopicsPagedResponse>\n"
-          + "      listTopicsSettings() {\n"
-          + "    return listTopicsSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to listTopicSubscriptions."
-          + " */\n"
-          + "  public PagedCallSettings<\n"
-          + "          ListTopicSubscriptionsRequest,\n"
-          + "          ListTopicSubscriptionsResponse,\n"
-          + "          ListTopicSubscriptionsPagedResponse>\n"
-          + "      listTopicSubscriptionsSettings() {\n"
-          + "    return listTopicSubscriptionsSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to listTopicSnapshots. */\n"
-          + "  public PagedCallSettings<\n"
-          + "          ListTopicSnapshotsRequest, ListTopicSnapshotsResponse,"
-          + " ListTopicSnapshotsPagedResponse>\n"
-          + "      listTopicSnapshotsSettings() {\n"
-          + "    return listTopicSnapshotsSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to deleteTopic. */\n"
-          + "  public UnaryCallSettings<DeleteTopicRequest, Empty> deleteTopicSettings() {\n"
-          + "    return deleteTopicSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the object with the settings used for calls to detachSubscription. */\n"
-          + "  public UnaryCallSettings<DetachSubscriptionRequest, DetachSubscriptionResponse>\n"
-          + "      detachSubscriptionSettings() {\n"
-          + "    return detachSubscriptionSettings;\n"
-          + "  }\n"
-          + "\n"
-          + "  @BetaApi(\"A restructuring of stub classes is planned, so this may break in the"
-          + " future\")\n"
-          + "  public PublisherStub createStub() throws IOException {\n"
-          + "    if (getTransportChannelProvider()\n"
-          + "        .getTransportName()\n"
-          + "        .equals(GrpcTransportChannel.getGrpcTransportName())) {\n"
-          + "      return GrpcPublisherStub.create(this);\n"
-          + "    }\n"
-          + "    throw new UnsupportedOperationException(\n"
-          + "        String.format(\n"
-          + "            \"Transport not supported: %s\","
-          + " getTransportChannelProvider().getTransportName()));\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a builder for the default ExecutorProvider for this service. */\n"
-          + "  public static InstantiatingExecutorProvider.Builder"
-          + " defaultExecutorProviderBuilder() {\n"
-          + "    return InstantiatingExecutorProvider.newBuilder();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the default service endpoint. */\n"
-          + "  public static String getDefaultEndpoint() {\n"
-          + "    return \"pubsub.googleapis.com:443\";\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns the default service scopes. */\n"
-          + "  public static List<String> getDefaultServiceScopes() {\n"
-          + "    return DEFAULT_SERVICE_SCOPES;\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a builder for the default credentials for this service. */\n"
-          + "  public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilder()"
-          + " {\n"
-          + "    return"
-          + " GoogleCredentialsProvider.newBuilder().setScopesToApply(DEFAULT_SERVICE_SCOPES);\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a builder for the default ChannelProvider for this service. */\n"
-          + "  public static InstantiatingGrpcChannelProvider.Builder"
-          + " defaultGrpcTransportProviderBuilder() {\n"
-          + "    return InstantiatingGrpcChannelProvider.newBuilder()\n"
-          + "        .setMaxInboundMessageSize(Integer.MAX_VALUE);\n"
-          + "  }\n"
-          + "\n"
-          + "  public static TransportChannelProvider defaultTransportChannelProvider() {\n"
-          + "    return defaultGrpcTransportProviderBuilder().build();\n"
-          + "  }\n"
-          + "\n"
-          + "  @BetaApi(\"The surface for customizing headers is not stable yet and may change in"
-          + " the future.\")\n"
-          + "  public static ApiClientHeaderProvider.Builder"
-          + " defaultApiClientHeaderProviderBuilder() {\n"
-          + "    return ApiClientHeaderProvider.newBuilder()\n"
-          + "        .setGeneratedLibToken(\"gapic\","
-          + " GaxProperties.getLibraryVersion(PublisherStubSettings.class))\n"
-          + "        .setTransportToken(\n"
-          + "            GaxGrpcProperties.getGrpcTokenName(),"
-          + " GaxGrpcProperties.getGrpcVersion());\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a new builder for this class. */\n"
-          + "  public static Builder newBuilder() {\n"
-          + "    return Builder.createDefault();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a new builder for this class. */\n"
-          + "  public static Builder newBuilder(ClientContext clientContext) {\n"
-          + "    return new Builder(clientContext);\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Returns a builder containing all the values of this settings class. */\n"
-          + "  public Builder toBuilder() {\n"
-          + "    return new Builder(this);\n"
-          + "  }\n"
-          + "\n"
-          + "  protected PublisherStubSettings(Builder settingsBuilder) throws IOException {\n"
-          + "    super(settingsBuilder);\n"
-          + "    createTopicSettings = settingsBuilder.createTopicSettings().build();\n"
-          + "    updateTopicSettings = settingsBuilder.updateTopicSettings().build();\n"
-          + "    publishSettings = settingsBuilder.publishSettings().build();\n"
-          + "    getTopicSettings = settingsBuilder.getTopicSettings().build();\n"
-          + "    listTopicsSettings = settingsBuilder.listTopicsSettings().build();\n"
-          + "    listTopicSubscriptionsSettings ="
-          + " settingsBuilder.listTopicSubscriptionsSettings().build();\n"
-          + "    listTopicSnapshotsSettings ="
-          + " settingsBuilder.listTopicSnapshotsSettings().build();\n"
-          + "    deleteTopicSettings = settingsBuilder.deleteTopicSettings().build();\n"
-          + "    detachSubscriptionSettings ="
-          + " settingsBuilder.detachSubscriptionSettings().build();\n"
-          + "  }\n"
-          + "\n"
-          + "  /** Builder for PublisherStubSettings. */\n"
-          + "  public static class Builder extends StubSettings.Builder<PublisherStubSettings,"
-          + " Builder> {\n"
-          + "    private final ImmutableList<UnaryCallSettings.Builder<?, ?>>"
-          + " unaryMethodSettingsBuilders;\n"
-          + "    private final UnaryCallSettings.Builder<Topic, Topic> createTopicSettings;\n"
-          + "    private final UnaryCallSettings.Builder<UpdateTopicRequest, Topic>"
-          + " updateTopicSettings;\n"
-          + "    private final BatchingCallSettings.Builder<PublishRequest, PublishResponse>"
-          + " publishSettings;\n"
-          + "    private final UnaryCallSettings.Builder<GetTopicRequest, Topic>"
-          + " getTopicSettings;\n"
-          + "    private final PagedCallSettings.Builder<\n"
-          + "            ListTopicsRequest, ListTopicsResponse, ListTopicsPagedResponse>\n"
-          + "        listTopicsSettings;\n"
-          + "    private final PagedCallSettings.Builder<\n"
-          + "            ListTopicSubscriptionsRequest,\n"
-          + "            ListTopicSubscriptionsResponse,\n"
-          + "            ListTopicSubscriptionsPagedResponse>\n"
-          + "        listTopicSubscriptionsSettings;\n"
-          + "    private final PagedCallSettings.Builder<\n"
-          + "            ListTopicSnapshotsRequest, ListTopicSnapshotsResponse,"
-          + " ListTopicSnapshotsPagedResponse>\n"
-          + "        listTopicSnapshotsSettings;\n"
-          + "    private final UnaryCallSettings.Builder<DeleteTopicRequest, Empty>"
-          + " deleteTopicSettings;\n"
-          + "    private final UnaryCallSettings.Builder<DetachSubscriptionRequest,"
-          + " DetachSubscriptionResponse>\n"
-          + "        detachSubscriptionSettings;\n"
-          + "    private static final ImmutableMap<String, ImmutableSet<StatusCode.Code>>\n"
-          + "        RETRYABLE_CODE_DEFINITIONS;\n"
-          + "\n"
-          + "    static {\n"
-          + "      ImmutableMap.Builder<String, ImmutableSet<StatusCode.Code>> definitions =\n"
-          + "          ImmutableMap.builder();\n"
-          + "      definitions.put(\n"
-          + "          \"retry_policy_0_codes\",\n"
-          + "         "
-          + " ImmutableSet.copyOf(Lists.<StatusCode.Code>newArrayList(StatusCode.Code.UNAVAILABLE)));\n"
-          + "      definitions.put(\n"
-          + "          \"retry_policy_1_codes\",\n"
-          + "          ImmutableSet.copyOf(\n"
-          + "              Lists.<StatusCode.Code>newArrayList(\n"
-          + "                  StatusCode.Code.ABORTED,\n"
-          + "                  StatusCode.Code.CANCELLED,\n"
-          + "                  StatusCode.Code.INTERNAL,\n"
-          + "                  StatusCode.Code.RESOURCE_EXHAUSTED,\n"
-          + "                  StatusCode.Code.UNKNOWN,\n"
-          + "                  StatusCode.Code.UNAVAILABLE,\n"
-          + "                  StatusCode.Code.DEADLINE_EXCEEDED)));\n"
-          + "      definitions.put(\n"
-          + "          \"retry_policy_2_codes\",\n"
-          + "          ImmutableSet.copyOf(\n"
-          + "              Lists.<StatusCode.Code>newArrayList(\n"
-          + "                  StatusCode.Code.UNKNOWN, StatusCode.Code.ABORTED,"
-          + " StatusCode.Code.UNAVAILABLE)));\n"
-          + "      RETRYABLE_CODE_DEFINITIONS = definitions.build();\n"
-          + "    }\n"
-          + "\n"
-          + "    private static final ImmutableMap<String, RetrySettings>"
-          + " RETRY_PARAM_DEFINITIONS;\n"
-          + "\n"
-          + "    static {\n"
-          + "      ImmutableMap.Builder<String, RetrySettings> definitions ="
-          + " ImmutableMap.builder();\n"
-          + "      RetrySettings settings = null;\n"
-          + "      settings =\n"
-          + "          RetrySettings.newBuilder()\n"
-          + "              .setInitialRetryDelay(Duration.ofMillis(100L))\n"
-          + "              .setRetryDelayMultiplier(1.3)\n"
-          + "              .setMaxRetryDelay(Duration.ofMillis(60000L))\n"
-          + "              .setInitialRpcTimeout(Duration.ofMillis(60000L))\n"
-          + "              .setRpcTimeoutMultiplier(1.0)\n"
-          + "              .setMaxRpcTimeout(Duration.ofMillis(60000L))\n"
-          + "              .setTotalTimeout(Duration.ofMillis(60000L))\n"
-          + "              .build();\n"
-          + "      definitions.put(\"retry_policy_0_params\", settings);\n"
-          + "      settings =\n"
-          + "          RetrySettings.newBuilder()\n"
-          + "              .setInitialRetryDelay(Duration.ofMillis(100L))\n"
-          + "              .setRetryDelayMultiplier(1.3)\n"
-          + "              .setMaxRetryDelay(Duration.ofMillis(60000L))\n"
-          + "              .setInitialRpcTimeout(Duration.ofMillis(60000L))\n"
-          + "              .setRpcTimeoutMultiplier(1.0)\n"
-          + "              .setMaxRpcTimeout(Duration.ofMillis(60000L))\n"
-          + "              .setTotalTimeout(Duration.ofMillis(60000L))\n"
-          + "              .build();\n"
-          + "      definitions.put(\"retry_policy_1_params\", settings);\n"
-          + "      settings =\n"
-          + "          RetrySettings.newBuilder()\n"
-          + "              .setInitialRetryDelay(Duration.ofMillis(100L))\n"
-          + "              .setRetryDelayMultiplier(1.3)\n"
-          + "              .setMaxRetryDelay(Duration.ofMillis(60000L))\n"
-          + "              .setInitialRpcTimeout(Duration.ofMillis(60000L))\n"
-          + "              .setRpcTimeoutMultiplier(1.0)\n"
-          + "              .setMaxRpcTimeout(Duration.ofMillis(60000L))\n"
-          + "              .setTotalTimeout(Duration.ofMillis(60000L))\n"
-          + "              .build();\n"
-          + "      definitions.put(\"retry_policy_2_params\", settings);\n"
-          + "      RETRY_PARAM_DEFINITIONS = definitions.build();\n"
-          + "    }\n"
-          + "\n"
-          + "    protected Builder() {\n"
-          + "      this(((ClientContext) null));\n"
-          + "    }\n"
-          + "\n"
-          + "    protected Builder(ClientContext clientContext) {\n"
-          + "      super(clientContext);\n"
-          + "      createTopicSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();\n"
-          + "      updateTopicSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();\n"
-          + "      publishSettings =\n"
-          + "          BatchingCallSettings.newBuilder(PUBLISH_BATCHING_DESC)\n"
-          + "              .setBatchingSettings(BatchingSettings.newBuilder().build());\n"
-          + "      getTopicSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();\n"
-          + "      listTopicsSettings = PagedCallSettings.newBuilder(LIST_TOPICS_PAGE_STR_FACT);\n"
-          + "      listTopicSubscriptionsSettings =\n"
-          + "          PagedCallSettings.newBuilder(LIST_TOPIC_SUBSCRIPTIONS_PAGE_STR_FACT);\n"
-          + "      listTopicSnapshotsSettings ="
-          + " PagedCallSettings.newBuilder(LIST_TOPIC_SNAPSHOTS_PAGE_STR_FACT);\n"
-          + "      deleteTopicSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();\n"
-          + "      detachSubscriptionSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();\n"
-          + "      unaryMethodSettingsBuilders =\n"
-          + "          ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(\n"
-          + "              createTopicSettings,\n"
-          + "              updateTopicSettings,\n"
-          + "              publishSettings,\n"
-          + "              getTopicSettings,\n"
-          + "              listTopicsSettings,\n"
-          + "              listTopicSubscriptionsSettings,\n"
-          + "              listTopicSnapshotsSettings,\n"
-          + "              deleteTopicSettings,\n"
-          + "              detachSubscriptionSettings);\n"
-          + "      initDefaults(this);\n"
-          + "    }\n"
-          + "\n"
-          + "    protected Builder(PublisherStubSettings settings) {\n"
-          + "      super(settings);\n"
-          + "      createTopicSettings = settings.createTopicSettings.toBuilder();\n"
-          + "      updateTopicSettings = settings.updateTopicSettings.toBuilder();\n"
-          + "      publishSettings = settings.publishSettings.toBuilder();\n"
-          + "      getTopicSettings = settings.getTopicSettings.toBuilder();\n"
-          + "      listTopicsSettings = settings.listTopicsSettings.toBuilder();\n"
-          + "      listTopicSubscriptionsSettings ="
-          + " settings.listTopicSubscriptionsSettings.toBuilder();\n"
-          + "      listTopicSnapshotsSettings = settings.listTopicSnapshotsSettings.toBuilder();\n"
-          + "      deleteTopicSettings = settings.deleteTopicSettings.toBuilder();\n"
-          + "      detachSubscriptionSettings = settings.detachSubscriptionSettings.toBuilder();\n"
-          + "      unaryMethodSettingsBuilders =\n"
-          + "          ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(\n"
-          + "              createTopicSettings,\n"
-          + "              updateTopicSettings,\n"
-          + "              publishSettings,\n"
-          + "              getTopicSettings,\n"
-          + "              listTopicsSettings,\n"
-          + "              listTopicSubscriptionsSettings,\n"
-          + "              listTopicSnapshotsSettings,\n"
-          + "              deleteTopicSettings,\n"
-          + "              detachSubscriptionSettings);\n"
-          + "    }\n"
-          + "\n"
-          + "    private static Builder createDefault() {\n"
-          + "      Builder builder = new Builder(((ClientContext) null));\n"
-          + "      builder.setTransportChannelProvider(defaultTransportChannelProvider());\n"
-          + "      builder.setCredentialsProvider(defaultCredentialsProviderBuilder().build());\n"
-          + "     "
-          + " builder.setInternalHeaderProvider(defaultApiClientHeaderProviderBuilder().build());\n"
-          + "      builder.setEndpoint(getDefaultEndpoint());\n"
-          + "      return initDefaults(builder);\n"
-          + "    }\n"
-          + "\n"
-          + "    private static Builder initDefaults(Builder builder) {\n"
-          + "      builder\n"
-          + "          .createTopicSettings()\n"
-          + "         "
-          + " .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"retry_policy_0_codes\"))\n"
-          + "         "
-          + " .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"retry_policy_0_params\"));\n"
-          + "      builder\n"
-          + "          .updateTopicSettings()\n"
-          + "         "
-          + " .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"retry_policy_0_codes\"))\n"
-          + "         "
-          + " .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"retry_policy_0_params\"));\n"
-          + "      builder\n"
-          + "          .publishSettings()\n"
-          + "          .setBatchingSettings(\n"
-          + "              BatchingSettings.newBuilder()\n"
-          + "                  .setElementCountThreshold(100L)\n"
-          + "                  .setRequestByteThreshold(1048576L)\n"
-          + "                  .setDelayThreshold(Duration.ofMillis(10L))\n"
-          + "                  .setFlowControlSettings(\n"
-          + "                      FlowControlSettings.newBuilder()\n"
-          + "                         "
-          + " .setLimitExceededBehavior(FlowController.LimitExceededBehavior.Ignore)\n"
-          + "                          .build())\n"
-          + "                  .build());\n"
-          + "      builder\n"
-          + "          .publishSettings()\n"
-          + "         "
-          + " .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"retry_policy_1_codes\"))\n"
-          + "         "
-          + " .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"retry_policy_1_params\"));\n"
-          + "      builder\n"
-          + "          .getTopicSettings()\n"
-          + "         "
-          + " .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"retry_policy_2_codes\"))\n"
-          + "         "
-          + " .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"retry_policy_2_params\"));\n"
-          + "      builder\n"
-          + "          .listTopicsSettings()\n"
-          + "         "
-          + " .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"retry_policy_2_codes\"))\n"
-          + "         "
-          + " .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"retry_policy_2_params\"));\n"
-          + "      builder\n"
-          + "          .listTopicSubscriptionsSettings()\n"
-          + "         "
-          + " .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"retry_policy_2_codes\"))\n"
-          + "         "
-          + " .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"retry_policy_2_params\"));\n"
-          + "      builder\n"
-          + "          .listTopicSnapshotsSettings()\n"
-          + "         "
-          + " .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"retry_policy_2_codes\"))\n"
-          + "         "
-          + " .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"retry_policy_2_params\"));\n"
-          + "      builder\n"
-          + "          .deleteTopicSettings()\n"
-          + "         "
-          + " .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"retry_policy_0_codes\"))\n"
-          + "         "
-          + " .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"retry_policy_0_params\"));\n"
-          + "      builder\n"
-          + "          .detachSubscriptionSettings()\n"
-          + "         "
-          + " .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get(\"retry_policy_0_codes\"))\n"
-          + "         "
-          + " .setRetrySettings(RETRY_PARAM_DEFINITIONS.get(\"retry_policy_0_params\"));\n"
-          + "      return builder;\n"
-          + "    }\n"
-          + "\n"
-          + "    // NEXT_MAJOR_VER: remove 'throws Exception'.\n"
-          + "    /**\n"
-          + "     * Applies the given settings updater function to all of the unary API methods in"
-          + " this service.\n"
-          + "     *\n"
-          + "     * <p>Note: This method does not support applying settings to streaming"
-          + " methods.\n"
-          + "     */\n"
-          + "    public Builder applyToAllUnaryMethods(\n"
-          + "        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) throws"
-          + " Exception {\n"
-          + "      super.applyToAllUnaryMethods(unaryMethodSettingsBuilders, settingsUpdater);\n"
-          + "      return this;\n"
-          + "    }\n"
-          + "\n"
-          + "    public ImmutableList<UnaryCallSettings.Builder<?, ?>>"
-          + " unaryMethodSettingsBuilders() {\n"
-          + "      return unaryMethodSettingsBuilders;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to createTopic. */\n"
-          + "    public UnaryCallSettings.Builder<Topic, Topic> createTopicSettings() {\n"
-          + "      return createTopicSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to updateTopic. */\n"
-          + "    public UnaryCallSettings.Builder<UpdateTopicRequest, Topic> updateTopicSettings()"
-          + " {\n"
-          + "      return updateTopicSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to publish. */\n"
-          + "    public BatchingCallSettings.Builder<PublishRequest, PublishResponse>"
-          + " publishSettings() {\n"
-          + "      return publishSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to getTopic. */\n"
-          + "    public UnaryCallSettings.Builder<GetTopicRequest, Topic> getTopicSettings() {\n"
-          + "      return getTopicSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to listTopics. */\n"
-          + "    public PagedCallSettings.Builder<ListTopicsRequest, ListTopicsResponse,"
-          + " ListTopicsPagedResponse>\n"
-          + "        listTopicsSettings() {\n"
-          + "      return listTopicsSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to"
-          + " listTopicSubscriptions. */\n"
-          + "    public PagedCallSettings.Builder<\n"
-          + "            ListTopicSubscriptionsRequest,\n"
-          + "            ListTopicSubscriptionsResponse,\n"
-          + "            ListTopicSubscriptionsPagedResponse>\n"
-          + "        listTopicSubscriptionsSettings() {\n"
-          + "      return listTopicSubscriptionsSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to listTopicSnapshots."
-          + " */\n"
-          + "    public PagedCallSettings.Builder<\n"
-          + "            ListTopicSnapshotsRequest, ListTopicSnapshotsResponse,"
-          + " ListTopicSnapshotsPagedResponse>\n"
-          + "        listTopicSnapshotsSettings() {\n"
-          + "      return listTopicSnapshotsSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to deleteTopic. */\n"
-          + "    public UnaryCallSettings.Builder<DeleteTopicRequest, Empty> deleteTopicSettings()"
-          + " {\n"
-          + "      return deleteTopicSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    /** Returns the builder for the settings used for calls to detachSubscription."
-          + " */\n"
-          + "    public UnaryCallSettings.Builder<DetachSubscriptionRequest,"
-          + " DetachSubscriptionResponse>\n"
-          + "        detachSubscriptionSettings() {\n"
-          + "      return detachSubscriptionSettings;\n"
-          + "    }\n"
-          + "\n"
-          + "    @Override\n"
-          + "    public PublisherStubSettings build() throws IOException {\n"
-          + "      return new PublisherStubSettings(this);\n"
-          + "    }\n"
-          + "  }\n"
-          + "}\n";
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/BUILD.bazel b/src/test/java/com/google/api/generator/gapic/composer/goldens/BUILD.bazel
new file mode 100644
index 0000000000..85ac1a519e
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/BUILD.bazel
@@ -0,0 +1,6 @@
+package(default_visibility = ["//visibility:public"])
+
+filegroup(
+    name = "goldens_files",
+    srcs = glob(["*.golden"]),
+)
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/BatchingDescriptorComposerTestNoSubresponse.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/BatchingDescriptorComposerTestNoSubresponse.golden
new file mode 100644
index 0000000000..b9c9eba122
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/BatchingDescriptorComposerTestNoSubresponse.golden
@@ -0,0 +1,53 @@
+private static final BatchingDescriptor<WriteLogEntriesRequest, WriteLogEntriesResponse> WRITE_LOG_ENTRIES_BATCHING_DESC = new BatchingDescriptor<WriteLogEntriesRequest, WriteLogEntriesResponse>() {
+@Override
+public PartitionKey getBatchPartitionKey(WriteLogEntriesRequest request) {
+return new PartitionKey(request.getLogName(), request.getResource(), request.getLabels());
+}
+
+@Override
+public RequestBuilder<WriteLogEntriesRequest> getRequestBuilder() {
+return new RequestBuilder<WriteLogEntriesRequest>() {
+private WriteLogEntriesRequest.Builder builder;
+@Override
+public void appendRequest(WriteLogEntriesRequest request) {
+if (Objects.isNull(builder)) {
+builder = request.toBuilder();
+} else {
+builder.addAllEntries(request.getEntriesList());
+}
+}
+
+@Override
+public WriteLogEntriesRequest build() {
+return builder.build();
+}
+
+};
+}
+
+@Override
+public void splitResponse(WriteLogEntriesResponse batchResponse, Collection<? extends BatchedRequestIssuer<WriteLogEntriesResponse>> batch) {
+for (BatchedRequestIssuer<WriteLogEntriesResponse> responder : batch) {
+WriteLogEntriesResponse response = WriteLogEntriesResponse.newBuilder().build();
+responder.setResponse(response);
+}
+}
+
+@Override
+public void splitException(Throwable throwable, Collection<? extends BatchedRequestIssuer<WriteLogEntriesResponse>> batch) {
+for (BatchedRequestIssuer<WriteLogEntriesResponse> responder : batch) {
+responder.setException(throwable);
+}
+}
+
+@Override
+public long countElements(WriteLogEntriesRequest request) {
+return request.getEntriesCount();
+}
+
+@Override
+public long countBytes(WriteLogEntriesRequest request) {
+return request.getSerializedSize();
+}
+
+}
\ No newline at end of file
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/BatchingDescriptorComposerTestSubresponse.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/BatchingDescriptorComposerTestSubresponse.golden
new file mode 100644
index 0000000000..1ebfca8696
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/BatchingDescriptorComposerTestSubresponse.golden
@@ -0,0 +1,59 @@
+private static final BatchingDescriptor<PublishRequest, PublishResponse> PUBLISH_BATCHING_DESC = new BatchingDescriptor<PublishRequest, PublishResponse>() {
+@Override
+public PartitionKey getBatchPartitionKey(PublishRequest request) {
+return new PartitionKey(request.getTopic());
+}
+
+@Override
+public RequestBuilder<PublishRequest> getRequestBuilder() {
+return new RequestBuilder<PublishRequest>() {
+private PublishRequest.Builder builder;
+@Override
+public void appendRequest(PublishRequest request) {
+if (Objects.isNull(builder)) {
+builder = request.toBuilder();
+} else {
+builder.addAllMessages(request.getMessagesList());
+}
+}
+
+@Override
+public PublishRequest build() {
+return builder.build();
+}
+
+};
+}
+
+@Override
+public void splitResponse(PublishResponse batchResponse, Collection<? extends BatchedRequestIssuer<PublishResponse>> batch) {
+int batchMessageIndex = 0;
+for (BatchedRequestIssuer<PublishResponse> responder : batch) {
+List<String> subresponseElements = new ArrayList<>();
+long subresponseCount = responder.getMessageCount();
+for (int i = 0; i < subresponseCount; i++) {
+subresponseElements.add(batchResponse.getMessageIds(batchMessageIndex++));
+}
+PublishResponse response = PublishResponse.newBuilder().addAllMessageIds(subresponseElements).build();
+responder.setResponse(response);
+}
+}
+
+@Override
+public void splitException(Throwable throwable, Collection<? extends BatchedRequestIssuer<PublishResponse>> batch) {
+for (BatchedRequestIssuer<PublishResponse> responder : batch) {
+responder.setException(throwable);
+}
+}
+
+@Override
+public long countElements(PublishRequest request) {
+return request.getMessagesCount();
+}
+
+@Override
+public long countBytes(PublishRequest request) {
+return request.getSerializedSize();
+}
+
+}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/ComposerTest.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/ComposerTest.golden
new file mode 100644
index 0000000000..ad531d6d09
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/ComposerTest.golden
@@ -0,0 +1,19 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.stub;
+
+public class EchoStubSettings {}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoSettings.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoSettings.golden
new file mode 100644
index 0000000000..076e0d772b
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoSettings.golden
@@ -0,0 +1,242 @@
+package com.google.showcase.v1beta1;
+
+import static com.google.showcase.v1beta1.EchoClient.PagedExpandPagedResponse;
+
+import com.google.api.core.ApiFunction;
+import com.google.api.core.BetaApi;
+import com.google.api.gax.core.GoogleCredentialsProvider;
+import com.google.api.gax.core.InstantiatingExecutorProvider;
+import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;
+import com.google.api.gax.rpc.ApiClientHeaderProvider;
+import com.google.api.gax.rpc.ClientContext;
+import com.google.api.gax.rpc.ClientSettings;
+import com.google.api.gax.rpc.OperationCallSettings;
+import com.google.api.gax.rpc.PagedCallSettings;
+import com.google.api.gax.rpc.ServerStreamingCallSettings;
+import com.google.api.gax.rpc.StreamingCallSettings;
+import com.google.api.gax.rpc.StubSettings;
+import com.google.api.gax.rpc.TransportChannelProvider;
+import com.google.api.gax.rpc.UnaryCallSettings;
+import com.google.longrunning.Operation;
+import com.google.showcase.v1beta1.stub.EchoStubSettings;
+import java.io.IOException;
+import java.util.List;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * Settings class to configure an instance of {@link EchoClient}.
+ *
+ * <p>The default instance has everything set to sensible defaults:
+ *
+ * <ul>
+ *   <li>The default service address (localhost) and default port (7469) are used.
+ *   <li>Credentials are acquired automatically through Application Default Credentials.
+ *   <li>Retries are configured for idempotent methods but not for non-idempotent methods.
+ * </ul>
+ *
+ * <p>The builder of this class is recursive, so contained classes are themselves builders. When
+ * build() is called, the tree of builders is called to create the complete settings object.
+ *
+ * <p>For example, to set the total timeout of echo to 30 seconds:
+ */
+@Generated("by gapic-generator-java")
+public class EchoSettings extends ClientSettings<EchoSettings> {
+
+  /** Returns the object with the settings used for calls to echo. */
+  public UnaryCallSettings<EchoRequest, EchoResponse> echoSettings() {
+    return ((EchoStubSettings) getStubSettings()).echoSettings();
+  }
+
+  /** Returns the object with the settings used for calls to expand. */
+  public ServerStreamingCallSettings<ExpandRequest, EchoResponse> expandSettings() {
+    return ((EchoStubSettings) getStubSettings()).expandSettings();
+  }
+
+  /** Returns the object with the settings used for calls to collect. */
+  public StreamingCallSettings<EchoRequest, EchoResponse> collectSettings() {
+    return ((EchoStubSettings) getStubSettings()).collectSettings();
+  }
+
+  /** Returns the object with the settings used for calls to chat. */
+  public StreamingCallSettings<EchoRequest, EchoResponse> chatSettings() {
+    return ((EchoStubSettings) getStubSettings()).chatSettings();
+  }
+
+  /** Returns the object with the settings used for calls to chatAgain. */
+  public StreamingCallSettings<EchoRequest, EchoResponse> chatAgainSettings() {
+    return ((EchoStubSettings) getStubSettings()).chatAgainSettings();
+  }
+
+  /** Returns the object with the settings used for calls to pagedExpand. */
+  public PagedCallSettings<PagedExpandRequest, PagedExpandResponse, PagedExpandPagedResponse>
+      pagedExpandSettings() {
+    return ((EchoStubSettings) getStubSettings()).pagedExpandSettings();
+  }
+
+  /** Returns the object with the settings used for calls to wait. */
+  public UnaryCallSettings<WaitRequest, Operation> waitSettings() {
+    return ((EchoStubSettings) getStubSettings()).waitSettings();
+  }
+
+  /** Returns the object with the settings used for calls to wait. */
+  public OperationCallSettings<WaitRequest, WaitResponse, WaitMetadata> waitOperationSettings() {
+    return ((EchoStubSettings) getStubSettings()).waitOperationSettings();
+  }
+
+  /** Returns the object with the settings used for calls to block. */
+  public UnaryCallSettings<BlockRequest, BlockResponse> blockSettings() {
+    return ((EchoStubSettings) getStubSettings()).blockSettings();
+  }
+
+  public static final EchoSettings create(EchoStubSettings stub) throws IOException {
+    return new EchoSettings.Builder(stub.toBuilder()).build();
+  }
+
+  /** Returns a builder for the default ExecutorProvider for this service. */
+  public static InstantiatingExecutorProvider.Builder defaultExecutorProviderBuilder() {
+    return EchoStubSettings.defaultExecutorProviderBuilder();
+  }
+
+  /** Returns the default service endpoint. */
+  public static String getDefaultEndpoint() {
+    return EchoStubSettings.getDefaultEndpoint();
+  }
+
+  /** Returns the default service scopes. */
+  public static List<String> getDefaultServiceScopes() {
+    return EchoStubSettings.getDefaultServiceScopes();
+  }
+
+  /** Returns a builder for the default credentials for this service. */
+  public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilder() {
+    return EchoStubSettings.defaultCredentialsProviderBuilder();
+  }
+
+  /** Returns a builder for the default ChannelProvider for this service. */
+  public static InstantiatingGrpcChannelProvider.Builder defaultGrpcTransportProviderBuilder() {
+    return EchoStubSettings.defaultGrpcTransportProviderBuilder();
+  }
+
+  public static TransportChannelProvider defaultTransportChannelProvider() {
+    return EchoStubSettings.defaultTransportChannelProvider();
+  }
+
+  @BetaApi("The surface for customizing headers is not stable yet and may change in the future.")
+  public static ApiClientHeaderProvider.Builder defaultApiClientHeaderProviderBuilder() {
+    return EchoStubSettings.defaultApiClientHeaderProviderBuilder();
+  }
+
+  /** Returns a new builder for this class. */
+  public static Builder newBuilder() {
+    return Builder.createDefault();
+  }
+
+  /** Returns a new builder for this class. */
+  public static Builder newBuilder(ClientContext clientContext) {
+    return new Builder(clientContext);
+  }
+
+  /** Returns a builder containing all the values of this settings class. */
+  public Builder toBuilder() {
+    return new Builder(this);
+  }
+
+  protected EchoSettings(Builder settingsBuilder) throws IOException {
+    super(settingsBuilder);
+  }
+
+  /** Builder for EchoSettings. */
+  public static class Builder extends ClientSettings.Builder<EchoSettings, Builder> {
+
+    protected Builder() throws IOException {
+      this(((ClientContext) null));
+    }
+
+    protected Builder(ClientContext clientContext) {
+      super(EchoStubSettings.newBuilder(clientContext));
+    }
+
+    protected Builder(EchoSettings settings) {
+      super(settings.getStubSettings().toBuilder());
+    }
+
+    protected Builder(EchoStubSettings.Builder stubSettings) {
+      super(stubSettings);
+    }
+
+    private static Builder createDefault() {
+      return new Builder(EchoStubSettings.newBuilder());
+    }
+
+    public EchoStubSettings.Builder getStubSettingsBuilder() {
+      return ((EchoStubSettings.Builder) getStubSettings());
+    }
+
+    // NEXT_MAJOR_VER: remove 'throws Exception'.
+    /**
+     * Applies the given settings updater function to all of the unary API methods in this service.
+     *
+     * <p>Note: This method does not support applying settings to streaming methods.
+     */
+    public Builder applyToAllUnaryMethods(
+        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) throws Exception {
+      super.applyToAllUnaryMethods(
+          getStubSettingsBuilder().unaryMethodSettingsBuilders(), settingsUpdater);
+      return this;
+    }
+
+    /** Returns the builder for the settings used for calls to echo. */
+    public UnaryCallSettings.Builder<EchoRequest, EchoResponse> echoSettings() {
+      return getStubSettingsBuilder().echoSettings();
+    }
+
+    /** Returns the builder for the settings used for calls to expand. */
+    public ServerStreamingCallSettings.Builder<ExpandRequest, EchoResponse> expandSettings() {
+      return getStubSettingsBuilder().expandSettings();
+    }
+
+    /** Returns the builder for the settings used for calls to collect. */
+    public StreamingCallSettings.Builder<EchoRequest, EchoResponse> collectSettings() {
+      return getStubSettingsBuilder().collectSettings();
+    }
+
+    /** Returns the builder for the settings used for calls to chat. */
+    public StreamingCallSettings.Builder<EchoRequest, EchoResponse> chatSettings() {
+      return getStubSettingsBuilder().chatSettings();
+    }
+
+    /** Returns the builder for the settings used for calls to chatAgain. */
+    public StreamingCallSettings.Builder<EchoRequest, EchoResponse> chatAgainSettings() {
+      return getStubSettingsBuilder().chatAgainSettings();
+    }
+
+    /** Returns the builder for the settings used for calls to pagedExpand. */
+    public PagedCallSettings.Builder<
+            PagedExpandRequest, PagedExpandResponse, PagedExpandPagedResponse>
+        pagedExpandSettings() {
+      return getStubSettingsBuilder().pagedExpandSettings();
+    }
+
+    /** Returns the builder for the settings used for calls to wait. */
+    public UnaryCallSettings.Builder<WaitRequest, Operation> waitSettings() {
+      return getStubSettingsBuilder().waitSettings();
+    }
+
+    /** Returns the builder for the settings used for calls to wait. */
+    public OperationCallSettings.Builder<WaitRequest, WaitResponse, WaitMetadata>
+        waitOperationSettings() {
+      return getStubSettingsBuilder().waitOperationSettings();
+    }
+
+    /** Returns the builder for the settings used for calls to block. */
+    public UnaryCallSettings.Builder<BlockRequest, BlockResponse> blockSettings() {
+      return getStubSettingsBuilder().blockSettings();
+    }
+
+    @Override
+    public EchoSettings build() throws IOException {
+      return new EchoSettings(this);
+    }
+  }
+}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoStub.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoStub.golden
new file mode 100644
index 0000000000..2b6ddd9a7e
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoStub.golden
@@ -0,0 +1,80 @@
+package com.google.showcase.v1beta1.stub;
+
+import static com.google.showcase.v1beta1.EchoClient.PagedExpandPagedResponse;
+
+import com.google.api.gax.core.BackgroundResource;
+import com.google.api.gax.rpc.BidiStreamingCallable;
+import com.google.api.gax.rpc.ClientStreamingCallable;
+import com.google.api.gax.rpc.OperationCallable;
+import com.google.api.gax.rpc.ServerStreamingCallable;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.longrunning.Operation;
+import com.google.longrunning.stub.OperationsStub;
+import com.google.showcase.v1beta1.BlockRequest;
+import com.google.showcase.v1beta1.BlockResponse;
+import com.google.showcase.v1beta1.EchoRequest;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.ExpandRequest;
+import com.google.showcase.v1beta1.PagedExpandRequest;
+import com.google.showcase.v1beta1.PagedExpandResponse;
+import com.google.showcase.v1beta1.WaitMetadata;
+import com.google.showcase.v1beta1.WaitRequest;
+import com.google.showcase.v1beta1.WaitResponse;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * Base stub class for the Echo service API.
+ *
+ * <p>This class is for advanced usage and reflects the underlying API directly.
+ */
+@Generated("by gapic-generator")
+public abstract class EchoStub implements BackgroundResource {
+
+  public OperationsStub getOperationsStub() {
+    throw new UnsupportedOperationException("Not implemented: getOperationsStub()");
+  }
+
+  public UnaryCallable<EchoRequest, EchoResponse> echoCallable() {
+    throw new UnsupportedOperationException("Not implemented: echoCallable()");
+  }
+
+  public ServerStreamingCallable<ExpandRequest, EchoResponse> expandCallable() {
+    throw new UnsupportedOperationException("Not implemented: expandCallable()");
+  }
+
+  public ClientStreamingCallable<EchoRequest, EchoResponse> collectCallable() {
+    throw new UnsupportedOperationException("Not implemented: collectCallable()");
+  }
+
+  public BidiStreamingCallable<EchoRequest, EchoResponse> chatCallable() {
+    throw new UnsupportedOperationException("Not implemented: chatCallable()");
+  }
+
+  public BidiStreamingCallable<EchoRequest, EchoResponse> chatAgainCallable() {
+    throw new UnsupportedOperationException("Not implemented: chatAgainCallable()");
+  }
+
+  public UnaryCallable<PagedExpandRequest, PagedExpandPagedResponse> pagedExpandPagedCallable() {
+    throw new UnsupportedOperationException("Not implemented: pagedExpandPagedCallable()");
+  }
+
+  public UnaryCallable<PagedExpandRequest, PagedExpandResponse> pagedExpandCallable() {
+    throw new UnsupportedOperationException("Not implemented: pagedExpandCallable()");
+  }
+
+  public OperationCallable<WaitRequest, WaitResponse, WaitMetadata> waitOperationCallable() {
+    throw new UnsupportedOperationException("Not implemented: waitOperationCallable()");
+  }
+
+  public UnaryCallable<WaitRequest, Operation> waitCallable() {
+    throw new UnsupportedOperationException("Not implemented: waitCallable()");
+  }
+
+  public UnaryCallable<BlockRequest, BlockResponse> blockCallable() {
+    throw new UnsupportedOperationException("Not implemented: blockCallable()");
+  }
+
+  @Override
+  public abstract void close();
+}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoStubSettings.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoStubSettings.golden
new file mode 100644
index 0000000000..d55d7a9f3f
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoStubSettings.golden
@@ -0,0 +1,486 @@
+package com.google.showcase.v1beta1.stub;
+
+import static com.google.showcase.v1beta1.EchoClient.PagedExpandPagedResponse;
+
+import com.google.api.core.ApiFunction;
+import com.google.api.core.ApiFuture;
+import com.google.api.core.BetaApi;
+import com.google.api.gax.core.GaxProperties;
+import com.google.api.gax.core.GoogleCredentialsProvider;
+import com.google.api.gax.core.InstantiatingExecutorProvider;
+import com.google.api.gax.grpc.GaxGrpcProperties;
+import com.google.api.gax.grpc.GrpcTransportChannel;
+import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;
+import com.google.api.gax.grpc.ProtoOperationTransformers;
+import com.google.api.gax.longrunning.OperationSnapshot;
+import com.google.api.gax.longrunning.OperationTimedPollAlgorithm;
+import com.google.api.gax.retrying.RetrySettings;
+import com.google.api.gax.rpc.ApiCallContext;
+import com.google.api.gax.rpc.ApiClientHeaderProvider;
+import com.google.api.gax.rpc.ClientContext;
+import com.google.api.gax.rpc.OperationCallSettings;
+import com.google.api.gax.rpc.PageContext;
+import com.google.api.gax.rpc.PagedCallSettings;
+import com.google.api.gax.rpc.PagedListDescriptor;
+import com.google.api.gax.rpc.PagedListResponseFactory;
+import com.google.api.gax.rpc.ServerStreamingCallSettings;
+import com.google.api.gax.rpc.StatusCode;
+import com.google.api.gax.rpc.StreamingCallSettings;
+import com.google.api.gax.rpc.StubSettings;
+import com.google.api.gax.rpc.TransportChannelProvider;
+import com.google.api.gax.rpc.UnaryCallSettings;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Lists;
+import com.google.longrunning.Operation;
+import com.google.showcase.v1beta1.BlockRequest;
+import com.google.showcase.v1beta1.BlockResponse;
+import com.google.showcase.v1beta1.EchoRequest;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.ExpandRequest;
+import com.google.showcase.v1beta1.PagedExpandRequest;
+import com.google.showcase.v1beta1.PagedExpandResponse;
+import com.google.showcase.v1beta1.WaitMetadata;
+import com.google.showcase.v1beta1.WaitRequest;
+import com.google.showcase.v1beta1.WaitResponse;
+import java.io.IOException;
+import java.util.List;
+import java.util.Objects;
+import javax.annotation.Generated;
+import org.threeten.bp.Duration;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * Settings class to configure an instance of {@link EchoStub}.
+ *
+ * <p>The default instance has everything set to sensible defaults:
+ *
+ * <ul>
+ *   <li>The default service address (localhost) and default port (7469) are used.
+ *   <li>Credentials are acquired automatically through Application Default Credentials.
+ *   <li>Retries are configured for idempotent methods but not for non-idempotent methods.
+ * </ul>
+ *
+ * <p>The builder of this class is recursive, so contained classes are themselves builders. When
+ * build() is called, the tree of builders is called to create the complete settings object.
+ *
+ * <p>For example, to set the total timeout of echo to 30 seconds:
+ */
+@BetaApi
+@Generated("by gapic-generator-java")
+public class EchoStubSettings extends StubSettings<EchoStubSettings> {
+  /** The default scopes of the service. */
+  private static final ImmutableList<String> DEFAULT_SERVICE_SCOPES =
+      ImmutableList.<String>builder().add("https://www.googleapis.com/auth/cloud-platform").build();
+
+  private final UnaryCallSettings<EchoRequest, EchoResponse> echoSettings;
+  private final ServerStreamingCallSettings<ExpandRequest, EchoResponse> expandSettings;
+  private final StreamingCallSettings<EchoRequest, EchoResponse> collectSettings;
+  private final StreamingCallSettings<EchoRequest, EchoResponse> chatSettings;
+  private final StreamingCallSettings<EchoRequest, EchoResponse> chatAgainSettings;
+  private final PagedCallSettings<PagedExpandRequest, PagedExpandResponse, PagedExpandPagedResponse>
+      pagedExpandSettings;
+  private final UnaryCallSettings<WaitRequest, Operation> waitSettings;
+  private final OperationCallSettings<WaitRequest, WaitResponse, WaitMetadata>
+      waitOperationSettings;
+  private final UnaryCallSettings<BlockRequest, BlockResponse> blockSettings;
+  private static final PagedListDescriptor<PagedExpandRequest, PagedExpandResponse, EchoResponse>
+      PAGED_EXPAND_PAGE_STR_DESC =
+          new PagedListDescriptor<PagedExpandRequest, PagedExpandResponse, EchoResponse>() {
+            @Override
+            public String emptyToken() {
+              return "";
+            }
+
+            @Override
+            public PagedExpandRequest injectToken(PagedExpandRequest payload, String token) {
+              return PagedExpandRequest.newBuilder(payload).setPageToken(token).build();
+            }
+
+            @Override
+            public PagedExpandRequest injectPageSize(PagedExpandRequest payload, int pageSize) {
+              return PagedExpandRequest.newBuilder(payload).setPageSize(pageSize).build();
+            }
+
+            @Override
+            public Integer extractPageSize(PagedExpandRequest payload) {
+              return payload.getPageSize();
+            }
+
+            @Override
+            public String extractNextToken(PagedExpandResponse payload) {
+              return payload.getNextPageToken();
+            }
+
+            @Override
+            public Iterable<EchoResponse> extractResources(PagedExpandResponse payload) {
+              return Objects.isNull(payload.getResponsesList())
+                  ? ImmutableList.<EchoResponse>of()
+                  : payload.getResponsesList();
+            }
+          };
+  private static final PagedListResponseFactory<
+          PagedExpandRequest, PagedExpandResponse, PagedExpandPagedResponse>
+      PAGED_EXPAND_PAGE_STR_FACT =
+          new PagedListResponseFactory<
+              PagedExpandRequest, PagedExpandResponse, PagedExpandPagedResponse>() {
+            @Override
+            public ApiFuture<PagedExpandPagedResponse> getFuturePagedResponse(
+                UnaryCallable<PagedExpandRequest, PagedExpandResponse> callable,
+                PagedExpandRequest request,
+                ApiCallContext context,
+                ApiFuture<PagedExpandResponse> futureResponse) {
+              PageContext<PagedExpandRequest, PagedExpandResponse, EchoResponse> pageContext =
+                  PageContext.create(callable, PAGED_EXPAND_PAGE_STR_DESC, request, context);
+              return PagedExpandPagedResponse.createAsync(pageContext, futureResponse);
+            }
+          };
+
+  /** Returns the object with the settings used for calls to echo. */
+  public UnaryCallSettings<EchoRequest, EchoResponse> echoSettings() {
+    return echoSettings;
+  }
+
+  /** Returns the object with the settings used for calls to expand. */
+  public ServerStreamingCallSettings<ExpandRequest, EchoResponse> expandSettings() {
+    return expandSettings;
+  }
+
+  /** Returns the object with the settings used for calls to collect. */
+  public StreamingCallSettings<EchoRequest, EchoResponse> collectSettings() {
+    return collectSettings;
+  }
+
+  /** Returns the object with the settings used for calls to chat. */
+  public StreamingCallSettings<EchoRequest, EchoResponse> chatSettings() {
+    return chatSettings;
+  }
+
+  /** Returns the object with the settings used for calls to chatAgain. */
+  public StreamingCallSettings<EchoRequest, EchoResponse> chatAgainSettings() {
+    return chatAgainSettings;
+  }
+
+  /** Returns the object with the settings used for calls to pagedExpand. */
+  public PagedCallSettings<PagedExpandRequest, PagedExpandResponse, PagedExpandPagedResponse>
+      pagedExpandSettings() {
+    return pagedExpandSettings;
+  }
+
+  /** Returns the object with the settings used for calls to wait. */
+  public UnaryCallSettings<WaitRequest, Operation> waitSettings() {
+    return waitSettings;
+  }
+
+  /** Returns the object with the settings used for calls to wait. */
+  public OperationCallSettings<WaitRequest, WaitResponse, WaitMetadata> waitOperationSettings() {
+    return waitOperationSettings;
+  }
+
+  /** Returns the object with the settings used for calls to block. */
+  public UnaryCallSettings<BlockRequest, BlockResponse> blockSettings() {
+    return blockSettings;
+  }
+
+  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
+  public EchoStub createStub() throws IOException {
+    if (getTransportChannelProvider()
+        .getTransportName()
+        .equals(GrpcTransportChannel.getGrpcTransportName())) {
+      return GrpcEchoStub.create(this);
+    }
+    throw new UnsupportedOperationException(
+        String.format(
+            "Transport not supported: %s", getTransportChannelProvider().getTransportName()));
+  }
+
+  /** Returns a builder for the default ExecutorProvider for this service. */
+  public static InstantiatingExecutorProvider.Builder defaultExecutorProviderBuilder() {
+    return InstantiatingExecutorProvider.newBuilder();
+  }
+
+  /** Returns the default service endpoint. */
+  public static String getDefaultEndpoint() {
+    return "localhost:7469";
+  }
+
+  /** Returns the default service scopes. */
+  public static List<String> getDefaultServiceScopes() {
+    return DEFAULT_SERVICE_SCOPES;
+  }
+
+  /** Returns a builder for the default credentials for this service. */
+  public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilder() {
+    return GoogleCredentialsProvider.newBuilder().setScopesToApply(DEFAULT_SERVICE_SCOPES);
+  }
+
+  /** Returns a builder for the default ChannelProvider for this service. */
+  public static InstantiatingGrpcChannelProvider.Builder defaultGrpcTransportProviderBuilder() {
+    return InstantiatingGrpcChannelProvider.newBuilder()
+        .setMaxInboundMessageSize(Integer.MAX_VALUE);
+  }
+
+  public static TransportChannelProvider defaultTransportChannelProvider() {
+    return defaultGrpcTransportProviderBuilder().build();
+  }
+
+  @BetaApi("The surface for customizing headers is not stable yet and may change in the future.")
+  public static ApiClientHeaderProvider.Builder defaultApiClientHeaderProviderBuilder() {
+    return ApiClientHeaderProvider.newBuilder()
+        .setGeneratedLibToken("gapic", GaxProperties.getLibraryVersion(EchoStubSettings.class))
+        .setTransportToken(
+            GaxGrpcProperties.getGrpcTokenName(), GaxGrpcProperties.getGrpcVersion());
+  }
+
+  /** Returns a new builder for this class. */
+  public static Builder newBuilder() {
+    return Builder.createDefault();
+  }
+
+  /** Returns a new builder for this class. */
+  public static Builder newBuilder(ClientContext clientContext) {
+    return new Builder(clientContext);
+  }
+
+  /** Returns a builder containing all the values of this settings class. */
+  public Builder toBuilder() {
+    return new Builder(this);
+  }
+
+  protected EchoStubSettings(Builder settingsBuilder) throws IOException {
+    super(settingsBuilder);
+    echoSettings = settingsBuilder.echoSettings().build();
+    expandSettings = settingsBuilder.expandSettings().build();
+    collectSettings = settingsBuilder.collectSettings().build();
+    chatSettings = settingsBuilder.chatSettings().build();
+    chatAgainSettings = settingsBuilder.chatAgainSettings().build();
+    pagedExpandSettings = settingsBuilder.pagedExpandSettings().build();
+    waitSettings = settingsBuilder.waitSettings().build();
+    waitOperationSettings = settingsBuilder.waitOperationSettings().build();
+    blockSettings = settingsBuilder.blockSettings().build();
+  }
+
+  /** Builder for EchoStubSettings. */
+  public static class Builder extends StubSettings.Builder<EchoStubSettings, Builder> {
+    private final ImmutableList<UnaryCallSettings.Builder<?, ?>> unaryMethodSettingsBuilders;
+    private final UnaryCallSettings.Builder<EchoRequest, EchoResponse> echoSettings;
+    private final ServerStreamingCallSettings.Builder<ExpandRequest, EchoResponse> expandSettings;
+    private final StreamingCallSettings.Builder<EchoRequest, EchoResponse> collectSettings;
+    private final StreamingCallSettings.Builder<EchoRequest, EchoResponse> chatSettings;
+    private final StreamingCallSettings.Builder<EchoRequest, EchoResponse> chatAgainSettings;
+    private final PagedCallSettings.Builder<
+            PagedExpandRequest, PagedExpandResponse, PagedExpandPagedResponse>
+        pagedExpandSettings;
+    private final UnaryCallSettings.Builder<WaitRequest, Operation> waitSettings;
+    private final OperationCallSettings.Builder<WaitRequest, WaitResponse, WaitMetadata>
+        waitOperationSettings;
+    private final UnaryCallSettings.Builder<BlockRequest, BlockResponse> blockSettings;
+    private static final ImmutableMap<String, ImmutableSet<StatusCode.Code>>
+        RETRYABLE_CODE_DEFINITIONS;
+
+    static {
+      ImmutableMap.Builder<String, ImmutableSet<StatusCode.Code>> definitions =
+          ImmutableMap.builder();
+      definitions.put(
+          "retry_policy_1_codes",
+          ImmutableSet.copyOf(
+              Lists.<StatusCode.Code>newArrayList(
+                  StatusCode.Code.UNAVAILABLE, StatusCode.Code.UNKNOWN)));
+      definitions.put(
+          "no_retry_0_codes", ImmutableSet.copyOf(Lists.<StatusCode.Code>newArrayList()));
+      RETRYABLE_CODE_DEFINITIONS = definitions.build();
+    }
+
+    private static final ImmutableMap<String, RetrySettings> RETRY_PARAM_DEFINITIONS;
+
+    static {
+      ImmutableMap.Builder<String, RetrySettings> definitions = ImmutableMap.builder();
+      RetrySettings settings = null;
+      settings =
+          RetrySettings.newBuilder()
+              .setInitialRetryDelay(Duration.ofMillis(100L))
+              .setRetryDelayMultiplier(2.0)
+              .setMaxRetryDelay(Duration.ofMillis(3000L))
+              .setInitialRpcTimeout(Duration.ofMillis(10000L))
+              .setRpcTimeoutMultiplier(1.0)
+              .setMaxRpcTimeout(Duration.ofMillis(10000L))
+              .setTotalTimeout(Duration.ofMillis(10000L))
+              .build();
+      definitions.put("retry_policy_1_params", settings);
+      settings =
+          RetrySettings.newBuilder()
+              .setInitialRpcTimeout(Duration.ofMillis(5000L))
+              .setRpcTimeoutMultiplier(1.0)
+              .setMaxRpcTimeout(Duration.ofMillis(5000L))
+              .setTotalTimeout(Duration.ofMillis(5000L))
+              .build();
+      definitions.put("no_retry_0_params", settings);
+      RETRY_PARAM_DEFINITIONS = definitions.build();
+    }
+
+    protected Builder() {
+      this(((ClientContext) null));
+    }
+
+    protected Builder(ClientContext clientContext) {
+      super(clientContext);
+      echoSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();
+      expandSettings = ServerStreamingCallSettings.newBuilder();
+      collectSettings = StreamingCallSettings.newBuilder();
+      chatSettings = StreamingCallSettings.newBuilder();
+      chatAgainSettings = StreamingCallSettings.newBuilder();
+      pagedExpandSettings = PagedCallSettings.newBuilder(PAGED_EXPAND_PAGE_STR_FACT);
+      waitSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();
+      waitOperationSettings = OperationCallSettings.newBuilder();
+      blockSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();
+      unaryMethodSettingsBuilders =
+          ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(
+              echoSettings, pagedExpandSettings, waitSettings, blockSettings);
+      initDefaults(this);
+    }
+
+    protected Builder(EchoStubSettings settings) {
+      super(settings);
+      echoSettings = settings.echoSettings.toBuilder();
+      expandSettings = settings.expandSettings.toBuilder();
+      collectSettings = settings.collectSettings.toBuilder();
+      chatSettings = settings.chatSettings.toBuilder();
+      chatAgainSettings = settings.chatAgainSettings.toBuilder();
+      pagedExpandSettings = settings.pagedExpandSettings.toBuilder();
+      waitSettings = settings.waitSettings.toBuilder();
+      waitOperationSettings = settings.waitOperationSettings.toBuilder();
+      blockSettings = settings.blockSettings.toBuilder();
+      unaryMethodSettingsBuilders =
+          ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(
+              echoSettings, pagedExpandSettings, waitSettings, blockSettings);
+    }
+
+    private static Builder createDefault() {
+      Builder builder = new Builder(((ClientContext) null));
+      builder.setTransportChannelProvider(defaultTransportChannelProvider());
+      builder.setCredentialsProvider(defaultCredentialsProviderBuilder().build());
+      builder.setInternalHeaderProvider(defaultApiClientHeaderProviderBuilder().build());
+      builder.setEndpoint(getDefaultEndpoint());
+      return initDefaults(builder);
+    }
+
+    private static Builder initDefaults(Builder builder) {
+      builder
+          .echoSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_1_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_1_params"));
+      builder
+          .expandSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_1_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_1_params"));
+      builder
+          .pagedExpandSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_1_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_1_params"));
+      builder
+          .waitSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("no_retry_0_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("no_retry_0_params"));
+      builder
+          .blockSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("no_retry_0_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("no_retry_0_params"));
+      builder
+          .waitOperationSettings()
+          .setInitialCallSettings(
+              UnaryCallSettings.<WaitRequest, OperationSnapshot>newUnaryCallSettingsBuilder()
+                  .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("no_retry_0_codes"))
+                  .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("no_retry_0_params"))
+                  .build())
+          .setResponseTransformer(
+              ProtoOperationTransformers.ResponseTransformer.create(WaitResponse.class))
+          .setMetadataTransformer(
+              ProtoOperationTransformers.MetadataTransformer.create(WaitMetadata.class))
+          .setPollingAlgorithm(
+              OperationTimedPollAlgorithm.create(
+                  RetrySettings.newBuilder()
+                      .setInitialRetryDelay(Duration.ofMillis(500L))
+                      .setRetryDelayMultiplier(1.5)
+                      .setMaxRetryDelay(Duration.ofMillis(5000L))
+                      .setInitialRpcTimeout(Duration.ZERO)
+                      .setRpcTimeoutMultiplier(1.0)
+                      .setMaxRpcTimeout(Duration.ZERO)
+                      .setTotalTimeout(Duration.ofMillis(300000L))
+                      .build()));
+      return builder;
+    }
+
+    // NEXT_MAJOR_VER: remove 'throws Exception'.
+    /**
+     * Applies the given settings updater function to all of the unary API methods in this service.
+     *
+     * <p>Note: This method does not support applying settings to streaming methods.
+     */
+    public Builder applyToAllUnaryMethods(
+        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) throws Exception {
+      super.applyToAllUnaryMethods(unaryMethodSettingsBuilders, settingsUpdater);
+      return this;
+    }
+
+    public ImmutableList<UnaryCallSettings.Builder<?, ?>> unaryMethodSettingsBuilders() {
+      return unaryMethodSettingsBuilders;
+    }
+
+    /** Returns the builder for the settings used for calls to echo. */
+    public UnaryCallSettings.Builder<EchoRequest, EchoResponse> echoSettings() {
+      return echoSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to expand. */
+    public ServerStreamingCallSettings.Builder<ExpandRequest, EchoResponse> expandSettings() {
+      return expandSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to collect. */
+    public StreamingCallSettings.Builder<EchoRequest, EchoResponse> collectSettings() {
+      return collectSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to chat. */
+    public StreamingCallSettings.Builder<EchoRequest, EchoResponse> chatSettings() {
+      return chatSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to chatAgain. */
+    public StreamingCallSettings.Builder<EchoRequest, EchoResponse> chatAgainSettings() {
+      return chatAgainSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to pagedExpand. */
+    public PagedCallSettings.Builder<
+            PagedExpandRequest, PagedExpandResponse, PagedExpandPagedResponse>
+        pagedExpandSettings() {
+      return pagedExpandSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to wait. */
+    public UnaryCallSettings.Builder<WaitRequest, Operation> waitSettings() {
+      return waitSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to wait. */
+    @BetaApi(
+        "The surface for use by generated code is not stable yet and may change in the future.")
+    public OperationCallSettings.Builder<WaitRequest, WaitResponse, WaitMetadata>
+        waitOperationSettings() {
+      return waitOperationSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to block. */
+    public UnaryCallSettings.Builder<BlockRequest, BlockResponse> blockSettings() {
+      return blockSettings;
+    }
+
+    @Override
+    public EchoStubSettings build() throws IOException {
+      return new EchoStubSettings(this);
+    }
+  }
+}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/FoobarName.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/FoobarName.golden
new file mode 100644
index 0000000000..7676c60e08
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/FoobarName.golden
@@ -0,0 +1,382 @@
+package com.google.showcase.v1beta1;
+
+import com.google.api.core.BetaApi;
+import com.google.api.pathtemplate.PathTemplate;
+import com.google.api.pathtemplate.ValidationException;
+import com.google.api.resourcenames.ResourceName;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.ImmutableMap;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+@Generated("by gapic-generator-java")
+public class FoobarName implements ResourceName {
+  private static final PathTemplate PROJECT_FOOBAR =
+      PathTemplate.createWithoutUrlEncoding("projects/{project}/foobars/{foobar}");
+  private static final PathTemplate PROJECT_VARIANT_FOOBAR =
+      PathTemplate.createWithoutUrlEncoding(
+          "projects/{project}/chocolate/variants/{variant}/foobars/{foobar}");
+  private static final PathTemplate FOOBAR =
+      PathTemplate.createWithoutUrlEncoding("foobars/{foobar}");
+  private static final PathTemplate BAR_FOO_FOOBAR =
+      PathTemplate.createWithoutUrlEncoding("bar_foos/{bar_foo}/foobars/{foobar}");
+  private volatile Map<String, String> fieldValuesMap;
+  private PathTemplate pathTemplate;
+  private String fixedValue;
+  private final String project;
+  private final String foobar;
+  private final String variant;
+  private final String barFoo;
+
+  private FoobarName(Builder builder) {
+    project = Preconditions.checkNotNull(builder.getProject());
+    foobar = Preconditions.checkNotNull(builder.getFoobar());
+    variant = null;
+    barFoo = null;
+    pathTemplate = PROJECT_FOOBAR;
+  }
+
+  private FoobarName(ProjectVariantFoobarBuilder builder) {
+    project = Preconditions.checkNotNull(builder.getProject());
+    variant = Preconditions.checkNotNull(builder.getVariant());
+    foobar = Preconditions.checkNotNull(builder.getFoobar());
+    barFoo = null;
+    pathTemplate = PROJECT_VARIANT_FOOBAR;
+  }
+
+  private FoobarName(FoobarBuilder builder) {
+    foobar = Preconditions.checkNotNull(builder.getFoobar());
+    project = null;
+    variant = null;
+    barFoo = null;
+    pathTemplate = FOOBAR;
+  }
+
+  private FoobarName(BarFooFoobarBuilder builder) {
+    barFoo = Preconditions.checkNotNull(builder.getBarFoo());
+    foobar = Preconditions.checkNotNull(builder.getFoobar());
+    project = null;
+    variant = null;
+    pathTemplate = BAR_FOO_FOOBAR;
+  }
+
+  public String getProject() {
+    return project;
+  }
+
+  public String getFoobar() {
+    return foobar;
+  }
+
+  public String getVariant() {
+    return variant;
+  }
+
+  public String getBarFoo() {
+    return barFoo;
+  }
+
+  public static Builder newBuilder() {
+    return new Builder();
+  }
+
+  @BetaApi("The per-pattern Builders are not stable yet and may be changed in the future.")
+  public static Builder newProjectFoobarBuilder() {
+    return new Builder();
+  }
+
+  @BetaApi("The per-pattern Builders are not stable yet and may be changed in the future.")
+  public static ProjectVariantFoobarBuilder newProjectVariantFoobarBuilder() {
+    return new ProjectVariantFoobarBuilder();
+  }
+
+  @BetaApi("The per-pattern Builders are not stable yet and may be changed in the future.")
+  public static FoobarBuilder newFoobarBuilder() {
+    return new FoobarBuilder();
+  }
+
+  @BetaApi("The per-pattern Builders are not stable yet and may be changed in the future.")
+  public static BarFooFoobarBuilder newBarFooFoobarBuilder() {
+    return new BarFooFoobarBuilder();
+  }
+
+  public Builder toBuilder() {
+    return new Builder(this);
+  }
+
+  public static FoobarName of(String project, String foobar) {
+    return newBuilder().setProject(project).setFoobar(foobar).build();
+  }
+
+  @BetaApi("The static create methods are not stable yet and may be changed in the future.")
+  public static FoobarName ofProjectFoobarBuilder(String project, String foobar) {
+    return newBuilder().setProject(project).setFoobar(foobar).build();
+  }
+
+  @BetaApi("The static create methods are not stable yet and may be changed in the future.")
+  public static FoobarName ofProjectVariantFoobarBuilder(
+      String project, String variant, String foobar) {
+    return newProjectVariantFoobarBuilder()
+        .setProject(project)
+        .setVariant(variant)
+        .setFoobar(foobar)
+        .build();
+  }
+
+  @BetaApi("The static create methods are not stable yet and may be changed in the future.")
+  public static FoobarName ofFoobarBuilder(String foobar) {
+    return newFoobarBuilder().setFoobar(foobar).build();
+  }
+
+  @BetaApi("The static create methods are not stable yet and may be changed in the future.")
+  public static FoobarName ofBarFooFoobarBuilder(String barFoo, String foobar) {
+    return newBarFooFoobarBuilder().setBarFoo(barFoo).setFoobar(foobar).build();
+  }
+
+  public static String format(String project, String foobar) {
+    return newBuilder().setProject(project).setFoobar(foobar).build().toString();
+  }
+
+  @BetaApi("The static format methods are not stable yet and may be changed in the future.")
+  public static String formatProjectFoobarBuilder(String project, String foobar) {
+    return newBuilder().setProject(project).setFoobar(foobar).build().toString();
+  }
+
+  @BetaApi("The static format methods are not stable yet and may be changed in the future.")
+  public static String formatProjectVariantFoobarBuilder(
+      String project, String variant, String foobar) {
+    return newProjectVariantFoobarBuilder()
+        .setProject(project)
+        .setVariant(variant)
+        .setFoobar(foobar)
+        .build()
+        .toString();
+  }
+
+  @BetaApi("The static format methods are not stable yet and may be changed in the future.")
+  public static String formatFoobarBuilder(String foobar) {
+    return newFoobarBuilder().setFoobar(foobar).build().toString();
+  }
+
+  @BetaApi("The static format methods are not stable yet and may be changed in the future.")
+  public static String formatBarFooFoobarBuilder(String barFoo, String foobar) {
+    return newBarFooFoobarBuilder().setBarFoo(barFoo).setFoobar(foobar).build().toString();
+  }
+
+  public static FoobarName parse(String formattedString) {
+    if (formattedString.isEmpty()) {
+      return null;
+    }
+    if (PROJECT_FOOBAR.matches(formattedString)) {
+      Map<String, String> matchMap = PROJECT_FOOBAR.match(formattedString);
+      return ofProjectFoobarBuilder(matchMap.get("project"), matchMap.get("foobar"));
+    } else if (PROJECT_VARIANT_FOOBAR.matches(formattedString)) {
+      Map<String, String> matchMap = PROJECT_VARIANT_FOOBAR.match(formattedString);
+      return ofProjectVariantFoobarBuilder(
+          matchMap.get("project"), matchMap.get("variant"), matchMap.get("foobar"));
+    } else if (FOOBAR.matches(formattedString)) {
+      Map<String, String> matchMap = FOOBAR.match(formattedString);
+      return ofFoobarBuilder(matchMap.get("foobar"));
+    } else if (BAR_FOO_FOOBAR.matches(formattedString)) {
+      Map<String, String> matchMap = BAR_FOO_FOOBAR.match(formattedString);
+      return ofBarFooFoobarBuilder(matchMap.get("bar_foo"), matchMap.get("foobar"));
+    }
+    throw new ValidationException("FoobarName.parse: formattedString not in valid format");
+  }
+
+  public static List<FoobarName> parseList(List<String> formattedStrings) {
+    List<FoobarName> list = new ArrayList<>(formattedStrings.size());
+    for (String formattedString : formattedStrings) {
+      list.add(parse(formattedString));
+    }
+    return list;
+  }
+
+  public static List<String> toStringList(List<FoobarName> values) {
+    List<String> list = new ArrayList<>(values.size());
+    for (FoobarName value : values) {
+      if (Objects.isNull(value)) {
+        list.add("");
+      } else {
+        list.add(value.toString());
+      }
+    }
+    return list;
+  }
+
+  public static boolean isParsableFrom(String formattedString) {
+    return PROJECT_FOOBAR.matches(formattedString)
+        || PROJECT_VARIANT_FOOBAR.matches(formattedString)
+        || FOOBAR.matches(formattedString)
+        || BAR_FOO_FOOBAR.matches(formattedString);
+  }
+
+  @Override
+  public Map<String, String> getFieldValuesMap() {
+    if (Objects.isNull(fieldValuesMap)) {
+      synchronized (this) {
+        if (Objects.isNull(fieldValuesMap)) {
+          ImmutableMap.Builder<String, String> fieldMapBuilder = ImmutableMap.builder();
+          if (!Objects.isNull(project)) {
+            fieldMapBuilder.put("project", project);
+          }
+          if (!Objects.isNull(foobar)) {
+            fieldMapBuilder.put("foobar", foobar);
+          }
+          if (!Objects.isNull(variant)) {
+            fieldMapBuilder.put("variant", variant);
+          }
+          if (!Objects.isNull(barFoo)) {
+            fieldMapBuilder.put("bar_foo", barFoo);
+          }
+          fieldValuesMap = fieldMapBuilder.build();
+        }
+      }
+    }
+    return fieldValuesMap;
+  }
+
+  public String getFieldValue(String fieldName) {
+    return getFieldValuesMap().get(fieldName);
+  }
+
+  @Override
+  public String toString() {
+    return !Objects.isNull(fixedValue) ? fixedValue : pathTemplate.instantiate(getFieldValuesMap());
+  }
+
+  /** Builder for projects/{project}/foobars/{foobar}. */
+  public static class Builder {
+    private String project;
+    private String foobar;
+
+    private Builder() {}
+
+    public String getProject() {
+      return project;
+    }
+
+    public String getFoobar() {
+      return foobar;
+    }
+
+    public Builder setProject(String project) {
+      this.project = project;
+      return this;
+    }
+
+    public Builder setFoobar(String foobar) {
+      this.foobar = foobar;
+      return this;
+    }
+
+    private Builder(FoobarName foobarName) {
+      Preconditions.checkArgument(
+          Objects.equals(foobarName.pathTemplate, PROJECT_FOOBAR),
+          "toBuilder is only supported when FoobarName has the pattern of projects/{project}/foobars/{foobar}");
+      project = foobarName.project;
+      foobar = foobarName.foobar;
+    }
+
+    public FoobarName build() {
+      return new FoobarName(this);
+    }
+  }
+
+  /** Builder for projects/{project}/chocolate/variants/{variant}/foobars/{foobar}. */
+  @BetaApi("The per-pattern Builders are not stable yet and may be changed in the future.")
+  public static class ProjectVariantFoobarBuilder {
+    private String project;
+    private String variant;
+    private String foobar;
+
+    private ProjectVariantFoobarBuilder() {}
+
+    public String getProject() {
+      return project;
+    }
+
+    public String getVariant() {
+      return variant;
+    }
+
+    public String getFoobar() {
+      return foobar;
+    }
+
+    public ProjectVariantFoobarBuilder setProject(String project) {
+      this.project = project;
+      return this;
+    }
+
+    public ProjectVariantFoobarBuilder setVariant(String variant) {
+      this.variant = variant;
+      return this;
+    }
+
+    public ProjectVariantFoobarBuilder setFoobar(String foobar) {
+      this.foobar = foobar;
+      return this;
+    }
+
+    public FoobarName build() {
+      return new FoobarName(this);
+    }
+  }
+
+  /** Builder for foobars/{foobar}. */
+  @BetaApi("The per-pattern Builders are not stable yet and may be changed in the future.")
+  public static class FoobarBuilder {
+    private String foobar;
+
+    private FoobarBuilder() {}
+
+    public String getFoobar() {
+      return foobar;
+    }
+
+    public FoobarBuilder setFoobar(String foobar) {
+      this.foobar = foobar;
+      return this;
+    }
+
+    public FoobarName build() {
+      return new FoobarName(this);
+    }
+  }
+
+  /** Builder for bar_foos/{bar_foo}/foobars/{foobar}. */
+  @BetaApi("The per-pattern Builders are not stable yet and may be changed in the future.")
+  public static class BarFooFoobarBuilder {
+    private String barFoo;
+    private String foobar;
+
+    private BarFooFoobarBuilder() {}
+
+    public String getBarFoo() {
+      return barFoo;
+    }
+
+    public String getFoobar() {
+      return foobar;
+    }
+
+    public BarFooFoobarBuilder setBarFoo(String barFoo) {
+      this.barFoo = barFoo;
+      return this;
+    }
+
+    public BarFooFoobarBuilder setFoobar(String foobar) {
+      this.foobar = foobar;
+      return this;
+    }
+
+    public FoobarName build() {
+      return new FoobarName(this);
+    }
+  }
+}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/GrpcEchoCallableFactory.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/GrpcEchoCallableFactory.golden
new file mode 100644
index 0000000000..0786cd3d1b
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/GrpcEchoCallableFactory.golden
@@ -0,0 +1,97 @@
+package com.google.showcase.v1beta1.stub;
+
+import com.google.api.gax.grpc.GrpcCallSettings;
+import com.google.api.gax.grpc.GrpcCallableFactory;
+import com.google.api.gax.grpc.GrpcStubCallableFactory;
+import com.google.api.gax.rpc.BatchingCallSettings;
+import com.google.api.gax.rpc.BidiStreamingCallable;
+import com.google.api.gax.rpc.ClientContext;
+import com.google.api.gax.rpc.ClientStreamingCallable;
+import com.google.api.gax.rpc.OperationCallSettings;
+import com.google.api.gax.rpc.OperationCallable;
+import com.google.api.gax.rpc.PagedCallSettings;
+import com.google.api.gax.rpc.ServerStreamingCallSettings;
+import com.google.api.gax.rpc.ServerStreamingCallable;
+import com.google.api.gax.rpc.StreamingCallSettings;
+import com.google.api.gax.rpc.UnaryCallSettings;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.longrunning.Operation;
+import com.google.longrunning.stub.OperationsStub;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * gRPC callable factory implementation for the Echo service API.
+ *
+ * <p>This class is for advanced usage.
+ */
+@Generated("by gapic-generator")
+public class GrpcEchoCallableFactory implements GrpcStubCallableFactory {
+
+  @Override
+  public <RequestT, ResponseT> UnaryCallable<RequestT, ResponseT> createUnaryCallable(
+      GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+      UnaryCallSettings<RequestT, ResponseT> callSettings,
+      ClientContext clientContext) {
+    return GrpcCallableFactory.createUnaryCallable(grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT, PagedListResponseT>
+      UnaryCallable<RequestT, PagedListResponseT> createPagedCallable(
+          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+          PagedCallSettings<RequestT, ResponseT, PagedListResponseT> callSettings,
+          ClientContext clientContext) {
+    return GrpcCallableFactory.createPagedCallable(grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT> UnaryCallable<RequestT, ResponseT> createBatchingCallable(
+      GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+      BatchingCallSettings<RequestT, ResponseT> callSettings,
+      ClientContext clientContext) {
+    return GrpcCallableFactory.createBatchingCallable(
+        grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT, MetadataT>
+      OperationCallable<RequestT, ResponseT, MetadataT> createOperationCallable(
+          GrpcCallSettings<RequestT, Operation> grpcCallSettings,
+          OperationCallSettings<RequestT, ResponseT, MetadataT> callSettings,
+          ClientContext clientContext,
+          OperationsStub operationsStub) {
+    return GrpcCallableFactory.createOperationCallable(
+        grpcCallSettings, callSettings, clientContext, operationsStub);
+  }
+
+  @Override
+  public <RequestT, ResponseT>
+      BidiStreamingCallable<RequestT, ResponseT> createBidiStreamingCallable(
+          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+          StreamingCallSettings<RequestT, ResponseT> callSettings,
+          ClientContext clientContext) {
+    return GrpcCallableFactory.createBidiStreamingCallable(
+        grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT>
+      ServerStreamingCallable<RequestT, ResponseT> createServerStreamingCallable(
+          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+          ServerStreamingCallSettings<RequestT, ResponseT> callSettings,
+          ClientContext clientContext) {
+    return GrpcCallableFactory.createServerStreamingCallable(
+        grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT>
+      ClientStreamingCallable<RequestT, ResponseT> createClientStreamingCallable(
+          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+          StreamingCallSettings<RequestT, ResponseT> callSettings,
+          ClientContext clientContext) {
+    return GrpcCallableFactory.createClientStreamingCallable(
+        grpcCallSettings, callSettings, clientContext);
+  }
+}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/GrpcEchoStub.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/GrpcEchoStub.golden
new file mode 100644
index 0000000000..fdc6daf449
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/GrpcEchoStub.golden
@@ -0,0 +1,278 @@
+package com.google.showcase.v1beta1.stub;
+
+import static com.google.showcase.v1beta1.EchoClient.PagedExpandPagedResponse;
+
+import com.google.api.gax.core.BackgroundResource;
+import com.google.api.gax.core.BackgroundResourceAggregation;
+import com.google.api.gax.grpc.GrpcCallSettings;
+import com.google.api.gax.grpc.GrpcStubCallableFactory;
+import com.google.api.gax.rpc.BidiStreamingCallable;
+import com.google.api.gax.rpc.ClientContext;
+import com.google.api.gax.rpc.ClientStreamingCallable;
+import com.google.api.gax.rpc.OperationCallable;
+import com.google.api.gax.rpc.ServerStreamingCallable;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.longrunning.Operation;
+import com.google.longrunning.stub.GrpcOperationsStub;
+import com.google.showcase.v1beta1.BlockRequest;
+import com.google.showcase.v1beta1.BlockResponse;
+import com.google.showcase.v1beta1.EchoRequest;
+import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.ExpandRequest;
+import com.google.showcase.v1beta1.PagedExpandRequest;
+import com.google.showcase.v1beta1.PagedExpandResponse;
+import com.google.showcase.v1beta1.WaitMetadata;
+import com.google.showcase.v1beta1.WaitRequest;
+import com.google.showcase.v1beta1.WaitResponse;
+import io.grpc.MethodDescriptor;
+import io.grpc.protobuf.ProtoUtils;
+import java.io.IOException;
+import java.util.concurrent.TimeUnit;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * gRPC stub implementation for the Echo service API.
+ *
+ * <p>This class is for advanced usage and reflects the underlying API directly.
+ */
+@Generated("by gapic-generator-java")
+public class GrpcEchoStub extends EchoStub {
+  private static final MethodDescriptor<EchoRequest, EchoResponse> echoMethodDescriptor =
+      MethodDescriptor.<EchoRequest, EchoResponse>newBuilder()
+          .setType(MethodDescriptor.MethodType.UNARY)
+          .setFullMethodName("google.showcase.v1beta1.Echo/Echo")
+          .setRequestMarshaller(ProtoUtils.marshaller(EchoRequest.getDefaultInstance()))
+          .setResponseMarshaller(ProtoUtils.marshaller(EchoResponse.getDefaultInstance()))
+          .build();
+  private static final MethodDescriptor<ExpandRequest, EchoResponse> expandMethodDescriptor =
+      MethodDescriptor.<ExpandRequest, EchoResponse>newBuilder()
+          .setType(MethodDescriptor.MethodType.SERVER_STREAMING)
+          .setFullMethodName("google.showcase.v1beta1.Echo/Expand")
+          .setRequestMarshaller(ProtoUtils.marshaller(ExpandRequest.getDefaultInstance()))
+          .setResponseMarshaller(ProtoUtils.marshaller(EchoResponse.getDefaultInstance()))
+          .build();
+  private static final MethodDescriptor<EchoRequest, EchoResponse> collectMethodDescriptor =
+      MethodDescriptor.<EchoRequest, EchoResponse>newBuilder()
+          .setType(MethodDescriptor.MethodType.CLIENT_STREAMING)
+          .setFullMethodName("google.showcase.v1beta1.Echo/Collect")
+          .setRequestMarshaller(ProtoUtils.marshaller(EchoRequest.getDefaultInstance()))
+          .setResponseMarshaller(ProtoUtils.marshaller(EchoResponse.getDefaultInstance()))
+          .build();
+  private static final MethodDescriptor<EchoRequest, EchoResponse> chatMethodDescriptor =
+      MethodDescriptor.<EchoRequest, EchoResponse>newBuilder()
+          .setType(MethodDescriptor.MethodType.BIDI_STREAMING)
+          .setFullMethodName("google.showcase.v1beta1.Echo/Chat")
+          .setRequestMarshaller(ProtoUtils.marshaller(EchoRequest.getDefaultInstance()))
+          .setResponseMarshaller(ProtoUtils.marshaller(EchoResponse.getDefaultInstance()))
+          .build();
+  private static final MethodDescriptor<EchoRequest, EchoResponse> chatAgainMethodDescriptor =
+      MethodDescriptor.<EchoRequest, EchoResponse>newBuilder()
+          .setType(MethodDescriptor.MethodType.BIDI_STREAMING)
+          .setFullMethodName("google.showcase.v1beta1.Echo/ChatAgain")
+          .setRequestMarshaller(ProtoUtils.marshaller(EchoRequest.getDefaultInstance()))
+          .setResponseMarshaller(ProtoUtils.marshaller(EchoResponse.getDefaultInstance()))
+          .build();
+  private static final MethodDescriptor<PagedExpandRequest, PagedExpandResponse>
+      pagedExpandMethodDescriptor =
+          MethodDescriptor.<PagedExpandRequest, PagedExpandResponse>newBuilder()
+              .setType(MethodDescriptor.MethodType.UNARY)
+              .setFullMethodName("google.showcase.v1beta1.Echo/PagedExpand")
+              .setRequestMarshaller(ProtoUtils.marshaller(PagedExpandRequest.getDefaultInstance()))
+              .setResponseMarshaller(
+                  ProtoUtils.marshaller(PagedExpandResponse.getDefaultInstance()))
+              .build();
+  private static final MethodDescriptor<WaitRequest, Operation> waitMethodDescriptor =
+      MethodDescriptor.<WaitRequest, Operation>newBuilder()
+          .setType(MethodDescriptor.MethodType.UNARY)
+          .setFullMethodName("google.showcase.v1beta1.Echo/Wait")
+          .setRequestMarshaller(ProtoUtils.marshaller(WaitRequest.getDefaultInstance()))
+          .setResponseMarshaller(ProtoUtils.marshaller(Operation.getDefaultInstance()))
+          .build();
+  private static final MethodDescriptor<BlockRequest, BlockResponse> blockMethodDescriptor =
+      MethodDescriptor.<BlockRequest, BlockResponse>newBuilder()
+          .setType(MethodDescriptor.MethodType.UNARY)
+          .setFullMethodName("google.showcase.v1beta1.Echo/Block")
+          .setRequestMarshaller(ProtoUtils.marshaller(BlockRequest.getDefaultInstance()))
+          .setResponseMarshaller(ProtoUtils.marshaller(BlockResponse.getDefaultInstance()))
+          .build();
+  private final UnaryCallable<EchoRequest, EchoResponse> echoCallable;
+  private final ServerStreamingCallable<ExpandRequest, EchoResponse> expandCallable;
+  private final ClientStreamingCallable<EchoRequest, EchoResponse> collectCallable;
+  private final BidiStreamingCallable<EchoRequest, EchoResponse> chatCallable;
+  private final BidiStreamingCallable<EchoRequest, EchoResponse> chatAgainCallable;
+  private final UnaryCallable<PagedExpandRequest, PagedExpandResponse> pagedExpandCallable;
+  private final UnaryCallable<PagedExpandRequest, PagedExpandPagedResponse>
+      pagedExpandPagedCallable;
+  private final UnaryCallable<WaitRequest, Operation> waitCallable;
+  private final OperationCallable<WaitRequest, WaitResponse, WaitMetadata> waitOperationCallable;
+  private final UnaryCallable<BlockRequest, BlockResponse> blockCallable;
+  private final BackgroundResource backgroundResources;
+  private final GrpcOperationsStub operationsStub;
+  private final GrpcStubCallableFactory callableFactory;
+
+  public static final GrpcEchoStub create(EchoStubSettings settings) throws IOException {
+    return new GrpcEchoStub(settings, ClientContext.create(settings));
+  }
+
+  public static final GrpcEchoStub create(ClientContext clientContext) throws IOException {
+    return new GrpcEchoStub(EchoStubSettings.newBuilder().build(), clientContext);
+  }
+
+  public static final GrpcEchoStub create(
+      ClientContext clientContext, GrpcStubCallableFactory callableFactory) throws IOException {
+    return new GrpcEchoStub(EchoStubSettings.newBuilder().build(), clientContext, callableFactory);
+  }
+
+  protected GrpcEchoStub(EchoStubSettings settings, ClientContext clientContext)
+      throws IOException {
+    this(settings, clientContext, new GrpcEchoCallableFactory());
+  }
+
+  protected GrpcEchoStub(
+      EchoStubSettings settings,
+      ClientContext clientContext,
+      GrpcStubCallableFactory callableFactory)
+      throws IOException {
+    this.callableFactory = callableFactory;
+    this.operationsStub = GrpcOperationsStub.create(clientContext, callableFactory);
+    GrpcCallSettings<EchoRequest, EchoResponse> echoTransportSettings =
+        GrpcCallSettings.<EchoRequest, EchoResponse>newBuilder()
+            .setMethodDescriptor(echoMethodDescriptor)
+            .build();
+    GrpcCallSettings<ExpandRequest, EchoResponse> expandTransportSettings =
+        GrpcCallSettings.<ExpandRequest, EchoResponse>newBuilder()
+            .setMethodDescriptor(expandMethodDescriptor)
+            .build();
+    GrpcCallSettings<EchoRequest, EchoResponse> collectTransportSettings =
+        GrpcCallSettings.<EchoRequest, EchoResponse>newBuilder()
+            .setMethodDescriptor(collectMethodDescriptor)
+            .build();
+    GrpcCallSettings<EchoRequest, EchoResponse> chatTransportSettings =
+        GrpcCallSettings.<EchoRequest, EchoResponse>newBuilder()
+            .setMethodDescriptor(chatMethodDescriptor)
+            .build();
+    GrpcCallSettings<EchoRequest, EchoResponse> chatAgainTransportSettings =
+        GrpcCallSettings.<EchoRequest, EchoResponse>newBuilder()
+            .setMethodDescriptor(chatAgainMethodDescriptor)
+            .build();
+    GrpcCallSettings<PagedExpandRequest, PagedExpandResponse> pagedExpandTransportSettings =
+        GrpcCallSettings.<PagedExpandRequest, PagedExpandResponse>newBuilder()
+            .setMethodDescriptor(pagedExpandMethodDescriptor)
+            .build();
+    GrpcCallSettings<WaitRequest, Operation> waitTransportSettings =
+        GrpcCallSettings.<WaitRequest, Operation>newBuilder()
+            .setMethodDescriptor(waitMethodDescriptor)
+            .build();
+    GrpcCallSettings<BlockRequest, BlockResponse> blockTransportSettings =
+        GrpcCallSettings.<BlockRequest, BlockResponse>newBuilder()
+            .setMethodDescriptor(blockMethodDescriptor)
+            .build();
+    this.echoCallable =
+        callableFactory.createUnaryCallable(
+            echoTransportSettings, settings.echoSettings(), clientContext);
+    this.expandCallable =
+        callableFactory.createServerStreamingCallable(
+            expandTransportSettings, settings.expandSettings(), clientContext);
+    this.collectCallable =
+        callableFactory.createClientStreamingCallable(
+            collectTransportSettings, settings.collectSettings(), clientContext);
+    this.chatCallable =
+        callableFactory.createBidiStreamingCallable(
+            chatTransportSettings, settings.chatSettings(), clientContext);
+    this.chatAgainCallable =
+        callableFactory.createBidiStreamingCallable(
+            chatAgainTransportSettings, settings.chatAgainSettings(), clientContext);
+    this.pagedExpandCallable =
+        callableFactory.createUnaryCallable(
+            pagedExpandTransportSettings, settings.pagedExpandSettings(), clientContext);
+    this.pagedExpandPagedCallable =
+        callableFactory.createPagedCallable(
+            pagedExpandTransportSettings, settings.pagedExpandSettings(), clientContext);
+    this.waitCallable =
+        callableFactory.createUnaryCallable(
+            waitTransportSettings, settings.waitSettings(), clientContext);
+    this.waitOperationCallable =
+        callableFactory.createOperationCallable(
+            waitTransportSettings, settings.waitOperationSettings(), clientContext, operationsStub);
+    this.blockCallable =
+        callableFactory.createUnaryCallable(
+            blockTransportSettings, settings.blockSettings(), clientContext);
+    this.backgroundResources =
+        new BackgroundResourceAggregation(clientContext.getBackgroundResources());
+  }
+
+  public GrpcOperationsStub getOperationsStub() {
+    return operationsStub;
+  }
+
+  public UnaryCallable<EchoRequest, EchoResponse> echoCallable() {
+    return echoCallable;
+  }
+
+  public ServerStreamingCallable<ExpandRequest, EchoResponse> expandCallable() {
+    return expandCallable;
+  }
+
+  public ClientStreamingCallable<EchoRequest, EchoResponse> collectCallable() {
+    return collectCallable;
+  }
+
+  public BidiStreamingCallable<EchoRequest, EchoResponse> chatCallable() {
+    return chatCallable;
+  }
+
+  public BidiStreamingCallable<EchoRequest, EchoResponse> chatAgainCallable() {
+    return chatAgainCallable;
+  }
+
+  public UnaryCallable<PagedExpandRequest, PagedExpandResponse> pagedExpandCallable() {
+    return pagedExpandCallable;
+  }
+
+  public UnaryCallable<PagedExpandRequest, PagedExpandPagedResponse> pagedExpandPagedCallable() {
+    return pagedExpandPagedCallable;
+  }
+
+  public UnaryCallable<WaitRequest, Operation> waitCallable() {
+    return waitCallable;
+  }
+
+  public OperationCallable<WaitRequest, WaitResponse, WaitMetadata> waitOperationCallable() {
+    return waitOperationCallable;
+  }
+
+  public UnaryCallable<BlockRequest, BlockResponse> blockCallable() {
+    return blockCallable;
+  }
+
+  @Override
+  public final void close() {
+    shutdown();
+  }
+
+  @Override
+  public void shutdown() {
+    backgroundResources.shutdown();
+  }
+
+  @Override
+  public boolean isShutdown() {
+    return backgroundResources.isShutdown();
+  }
+
+  @Override
+  public boolean isTerminated() {
+    return backgroundResources.isTerminated();
+  }
+
+  @Override
+  public void shutdownNow() {
+    backgroundResources.shutdownNow();
+  }
+
+  @Override
+  public boolean awaitTermination(long duration, TimeUnit unit) throws InterruptedException {
+    return backgroundResources.awaitTermination(duration, unit);
+  }
+}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/LoggingServiceV2StubSettings.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/LoggingServiceV2StubSettings.golden
new file mode 100644
index 0000000000..9b34b02c44
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/LoggingServiceV2StubSettings.golden
@@ -0,0 +1,649 @@
+package com.google.logging.v2.stub;
+
+import static com.google.logging.v2.LoggingServiceV2Client.ListLogEntriesPagedResponse;
+import static com.google.logging.v2.LoggingServiceV2Client.ListLogsPagedResponse;
+import static com.google.logging.v2.LoggingServiceV2Client.ListMonitoredResourceDescriptorsPagedResponse;
+
+import com.google.api.MonitoredResourceDescriptor;
+import com.google.api.core.ApiFunction;
+import com.google.api.core.ApiFuture;
+import com.google.api.core.BetaApi;
+import com.google.api.gax.batching.BatchingSettings;
+import com.google.api.gax.batching.FlowControlSettings;
+import com.google.api.gax.batching.FlowController;
+import com.google.api.gax.batching.PartitionKey;
+import com.google.api.gax.batching.RequestBuilder;
+import com.google.api.gax.core.GaxProperties;
+import com.google.api.gax.core.GoogleCredentialsProvider;
+import com.google.api.gax.core.InstantiatingExecutorProvider;
+import com.google.api.gax.grpc.GaxGrpcProperties;
+import com.google.api.gax.grpc.GrpcTransportChannel;
+import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;
+import com.google.api.gax.retrying.RetrySettings;
+import com.google.api.gax.rpc.ApiCallContext;
+import com.google.api.gax.rpc.ApiClientHeaderProvider;
+import com.google.api.gax.rpc.BatchedRequestIssuer;
+import com.google.api.gax.rpc.BatchingCallSettings;
+import com.google.api.gax.rpc.BatchingDescriptor;
+import com.google.api.gax.rpc.ClientContext;
+import com.google.api.gax.rpc.PageContext;
+import com.google.api.gax.rpc.PagedCallSettings;
+import com.google.api.gax.rpc.PagedListDescriptor;
+import com.google.api.gax.rpc.PagedListResponseFactory;
+import com.google.api.gax.rpc.StatusCode;
+import com.google.api.gax.rpc.StubSettings;
+import com.google.api.gax.rpc.TransportChannelProvider;
+import com.google.api.gax.rpc.UnaryCallSettings;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Lists;
+import com.google.logging.v2.DeleteLogRequest;
+import com.google.logging.v2.ListLogEntriesRequest;
+import com.google.logging.v2.ListLogEntriesResponse;
+import com.google.logging.v2.ListLogsRequest;
+import com.google.logging.v2.ListLogsResponse;
+import com.google.logging.v2.ListMonitoredResourceDescriptorsRequest;
+import com.google.logging.v2.ListMonitoredResourceDescriptorsResponse;
+import com.google.logging.v2.LogEntry;
+import com.google.logging.v2.WriteLogEntriesRequest;
+import com.google.logging.v2.WriteLogEntriesResponse;
+import com.google.protobuf.Empty;
+import java.io.IOException;
+import java.util.Collection;
+import java.util.List;
+import java.util.Objects;
+import javax.annotation.Generated;
+import org.threeten.bp.Duration;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * Settings class to configure an instance of {@link LoggingServiceV2Stub}.
+ *
+ * <p>The default instance has everything set to sensible defaults:
+ *
+ * <ul>
+ *   <li>The default service address (logging.googleapis.com) and default port (443) are used.
+ *   <li>Credentials are acquired automatically through Application Default Credentials.
+ *   <li>Retries are configured for idempotent methods but not for non-idempotent methods.
+ * </ul>
+ *
+ * <p>The builder of this class is recursive, so contained classes are themselves builders. When
+ * build() is called, the tree of builders is called to create the complete settings object.
+ *
+ * <p>For example, to set the total timeout of deleteLog to 30 seconds:
+ */
+@BetaApi
+@Generated("by gapic-generator-java")
+public class LoggingServiceV2StubSettings extends StubSettings<LoggingServiceV2StubSettings> {
+  /** The default scopes of the service. */
+  private static final ImmutableList<String> DEFAULT_SERVICE_SCOPES =
+      ImmutableList.<String>builder()
+          .add("https://www.googleapis.com/auth/cloud-platform")
+          .add("https://www.googleapis.com/auth/cloud-platform.read-only")
+          .add("https://www.googleapis.com/auth/logging.admin")
+          .add("https://www.googleapis.com/auth/logging.read")
+          .add("https://www.googleapis.com/auth/logging.write")
+          .build();
+
+  private final UnaryCallSettings<DeleteLogRequest, Empty> deleteLogSettings;
+  private final BatchingCallSettings<WriteLogEntriesRequest, WriteLogEntriesResponse>
+      writeLogEntriesSettings;
+  private final PagedCallSettings<
+          ListLogEntriesRequest, ListLogEntriesResponse, ListLogEntriesPagedResponse>
+      listLogEntriesSettings;
+  private final PagedCallSettings<
+          ListMonitoredResourceDescriptorsRequest,
+          ListMonitoredResourceDescriptorsResponse,
+          ListMonitoredResourceDescriptorsPagedResponse>
+      listMonitoredResourceDescriptorsSettings;
+  private final PagedCallSettings<ListLogsRequest, ListLogsResponse, ListLogsPagedResponse>
+      listLogsSettings;
+  private static final PagedListDescriptor<ListLogEntriesRequest, ListLogEntriesResponse, LogEntry>
+      LIST_LOG_ENTRIES_PAGE_STR_DESC =
+          new PagedListDescriptor<ListLogEntriesRequest, ListLogEntriesResponse, LogEntry>() {
+            @Override
+            public String emptyToken() {
+              return "";
+            }
+
+            @Override
+            public ListLogEntriesRequest injectToken(ListLogEntriesRequest payload, String token) {
+              return ListLogEntriesRequest.newBuilder(payload).setPageToken(token).build();
+            }
+
+            @Override
+            public ListLogEntriesRequest injectPageSize(
+                ListLogEntriesRequest payload, int pageSize) {
+              return ListLogEntriesRequest.newBuilder(payload).setPageSize(pageSize).build();
+            }
+
+            @Override
+            public Integer extractPageSize(ListLogEntriesRequest payload) {
+              return payload.getPageSize();
+            }
+
+            @Override
+            public String extractNextToken(ListLogEntriesResponse payload) {
+              return payload.getNextPageToken();
+            }
+
+            @Override
+            public Iterable<LogEntry> extractResources(ListLogEntriesResponse payload) {
+              return Objects.isNull(payload.getEntriesList())
+                  ? ImmutableList.<LogEntry>of()
+                  : payload.getEntriesList();
+            }
+          };
+  private static final PagedListDescriptor<
+          ListMonitoredResourceDescriptorsRequest,
+          ListMonitoredResourceDescriptorsResponse,
+          MonitoredResourceDescriptor>
+      LIST_MONITORED_RESOURCE_DESCRIPTORS_PAGE_STR_DESC =
+          new PagedListDescriptor<
+              ListMonitoredResourceDescriptorsRequest,
+              ListMonitoredResourceDescriptorsResponse,
+              MonitoredResourceDescriptor>() {
+            @Override
+            public String emptyToken() {
+              return "";
+            }
+
+            @Override
+            public ListMonitoredResourceDescriptorsRequest injectToken(
+                ListMonitoredResourceDescriptorsRequest payload, String token) {
+              return ListMonitoredResourceDescriptorsRequest.newBuilder(payload)
+                  .setPageToken(token)
+                  .build();
+            }
+
+            @Override
+            public ListMonitoredResourceDescriptorsRequest injectPageSize(
+                ListMonitoredResourceDescriptorsRequest payload, int pageSize) {
+              return ListMonitoredResourceDescriptorsRequest.newBuilder(payload)
+                  .setPageSize(pageSize)
+                  .build();
+            }
+
+            @Override
+            public Integer extractPageSize(ListMonitoredResourceDescriptorsRequest payload) {
+              return payload.getPageSize();
+            }
+
+            @Override
+            public String extractNextToken(ListMonitoredResourceDescriptorsResponse payload) {
+              return payload.getNextPageToken();
+            }
+
+            @Override
+            public Iterable<MonitoredResourceDescriptor> extractResources(
+                ListMonitoredResourceDescriptorsResponse payload) {
+              return Objects.isNull(payload.getResourceDescriptorsList())
+                  ? ImmutableList.<MonitoredResourceDescriptor>of()
+                  : payload.getResourceDescriptorsList();
+            }
+          };
+  private static final PagedListDescriptor<ListLogsRequest, ListLogsResponse, String>
+      LIST_LOGS_PAGE_STR_DESC =
+          new PagedListDescriptor<ListLogsRequest, ListLogsResponse, String>() {
+            @Override
+            public String emptyToken() {
+              return "";
+            }
+
+            @Override
+            public ListLogsRequest injectToken(ListLogsRequest payload, String token) {
+              return ListLogsRequest.newBuilder(payload).setPageToken(token).build();
+            }
+
+            @Override
+            public ListLogsRequest injectPageSize(ListLogsRequest payload, int pageSize) {
+              return ListLogsRequest.newBuilder(payload).setPageSize(pageSize).build();
+            }
+
+            @Override
+            public Integer extractPageSize(ListLogsRequest payload) {
+              return payload.getPageSize();
+            }
+
+            @Override
+            public String extractNextToken(ListLogsResponse payload) {
+              return payload.getNextPageToken();
+            }
+
+            @Override
+            public Iterable<String> extractResources(ListLogsResponse payload) {
+              return Objects.isNull(payload.getLogNamesList())
+                  ? ImmutableList.<String>of()
+                  : payload.getLogNamesList();
+            }
+          };
+  private static final PagedListResponseFactory<
+          ListLogEntriesRequest, ListLogEntriesResponse, ListLogEntriesPagedResponse>
+      LIST_LOG_ENTRIES_PAGE_STR_FACT =
+          new PagedListResponseFactory<
+              ListLogEntriesRequest, ListLogEntriesResponse, ListLogEntriesPagedResponse>() {
+            @Override
+            public ApiFuture<ListLogEntriesPagedResponse> getFuturePagedResponse(
+                UnaryCallable<ListLogEntriesRequest, ListLogEntriesResponse> callable,
+                ListLogEntriesRequest request,
+                ApiCallContext context,
+                ApiFuture<ListLogEntriesResponse> futureResponse) {
+              PageContext<ListLogEntriesRequest, ListLogEntriesResponse, LogEntry> pageContext =
+                  PageContext.create(callable, LIST_LOG_ENTRIES_PAGE_STR_DESC, request, context);
+              return ListLogEntriesPagedResponse.createAsync(pageContext, futureResponse);
+            }
+          };
+  private static final PagedListResponseFactory<
+          ListMonitoredResourceDescriptorsRequest,
+          ListMonitoredResourceDescriptorsResponse,
+          ListMonitoredResourceDescriptorsPagedResponse>
+      LIST_MONITORED_RESOURCE_DESCRIPTORS_PAGE_STR_FACT =
+          new PagedListResponseFactory<
+              ListMonitoredResourceDescriptorsRequest,
+              ListMonitoredResourceDescriptorsResponse,
+              ListMonitoredResourceDescriptorsPagedResponse>() {
+            @Override
+            public ApiFuture<ListMonitoredResourceDescriptorsPagedResponse> getFuturePagedResponse(
+                UnaryCallable<
+                        ListMonitoredResourceDescriptorsRequest,
+                        ListMonitoredResourceDescriptorsResponse>
+                    callable,
+                ListMonitoredResourceDescriptorsRequest request,
+                ApiCallContext context,
+                ApiFuture<ListMonitoredResourceDescriptorsResponse> futureResponse) {
+              PageContext<
+                      ListMonitoredResourceDescriptorsRequest,
+                      ListMonitoredResourceDescriptorsResponse,
+                      MonitoredResourceDescriptor>
+                  pageContext =
+                      PageContext.create(
+                          callable,
+                          LIST_MONITORED_RESOURCE_DESCRIPTORS_PAGE_STR_DESC,
+                          request,
+                          context);
+              return ListMonitoredResourceDescriptorsPagedResponse.createAsync(
+                  pageContext, futureResponse);
+            }
+          };
+  private static final PagedListResponseFactory<
+          ListLogsRequest, ListLogsResponse, ListLogsPagedResponse>
+      LIST_LOGS_PAGE_STR_FACT =
+          new PagedListResponseFactory<ListLogsRequest, ListLogsResponse, ListLogsPagedResponse>() {
+            @Override
+            public ApiFuture<ListLogsPagedResponse> getFuturePagedResponse(
+                UnaryCallable<ListLogsRequest, ListLogsResponse> callable,
+                ListLogsRequest request,
+                ApiCallContext context,
+                ApiFuture<ListLogsResponse> futureResponse) {
+              PageContext<ListLogsRequest, ListLogsResponse, String> pageContext =
+                  PageContext.create(callable, LIST_LOGS_PAGE_STR_DESC, request, context);
+              return ListLogsPagedResponse.createAsync(pageContext, futureResponse);
+            }
+          };
+  private static final BatchingDescriptor<WriteLogEntriesRequest, WriteLogEntriesResponse>
+      WRITE_LOG_ENTRIES_BATCHING_DESC =
+          new BatchingDescriptor<WriteLogEntriesRequest, WriteLogEntriesResponse>() {
+            @Override
+            public PartitionKey getBatchPartitionKey(WriteLogEntriesRequest request) {
+              return new PartitionKey(
+                  request.getLogName(), request.getResource(), request.getLabels());
+            }
+
+            @Override
+            public RequestBuilder<WriteLogEntriesRequest> getRequestBuilder() {
+              return new RequestBuilder<WriteLogEntriesRequest>() {
+                private WriteLogEntriesRequest.Builder builder;
+
+                @Override
+                public void appendRequest(WriteLogEntriesRequest request) {
+                  if (Objects.isNull(builder)) {
+                    builder = request.toBuilder();
+                  } else {
+                    builder.addAllEntries(request.getEntriesList());
+                  }
+                }
+
+                @Override
+                public WriteLogEntriesRequest build() {
+                  return builder.build();
+                }
+              };
+            }
+
+            @Override
+            public void splitResponse(
+                WriteLogEntriesResponse batchResponse,
+                Collection<? extends BatchedRequestIssuer<WriteLogEntriesResponse>> batch) {
+              for (BatchedRequestIssuer<WriteLogEntriesResponse> responder : batch) {
+                WriteLogEntriesResponse response = WriteLogEntriesResponse.newBuilder().build();
+                responder.setResponse(response);
+              }
+            }
+
+            @Override
+            public void splitException(
+                Throwable throwable,
+                Collection<? extends BatchedRequestIssuer<WriteLogEntriesResponse>> batch) {
+              for (BatchedRequestIssuer<WriteLogEntriesResponse> responder : batch) {
+                responder.setException(throwable);
+              }
+            }
+
+            @Override
+            public long countElements(WriteLogEntriesRequest request) {
+              return request.getEntriesCount();
+            }
+
+            @Override
+            public long countBytes(WriteLogEntriesRequest request) {
+              return request.getSerializedSize();
+            }
+          };
+
+  /** Returns the object with the settings used for calls to deleteLog. */
+  public UnaryCallSettings<DeleteLogRequest, Empty> deleteLogSettings() {
+    return deleteLogSettings;
+  }
+
+  /** Returns the object with the settings used for calls to writeLogEntries. */
+  public BatchingCallSettings<WriteLogEntriesRequest, WriteLogEntriesResponse>
+      writeLogEntriesSettings() {
+    return writeLogEntriesSettings;
+  }
+
+  /** Returns the object with the settings used for calls to listLogEntries. */
+  public PagedCallSettings<
+          ListLogEntriesRequest, ListLogEntriesResponse, ListLogEntriesPagedResponse>
+      listLogEntriesSettings() {
+    return listLogEntriesSettings;
+  }
+
+  /** Returns the object with the settings used for calls to listMonitoredResourceDescriptors. */
+  public PagedCallSettings<
+          ListMonitoredResourceDescriptorsRequest,
+          ListMonitoredResourceDescriptorsResponse,
+          ListMonitoredResourceDescriptorsPagedResponse>
+      listMonitoredResourceDescriptorsSettings() {
+    return listMonitoredResourceDescriptorsSettings;
+  }
+
+  /** Returns the object with the settings used for calls to listLogs. */
+  public PagedCallSettings<ListLogsRequest, ListLogsResponse, ListLogsPagedResponse>
+      listLogsSettings() {
+    return listLogsSettings;
+  }
+
+  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
+  public LoggingServiceV2Stub createStub() throws IOException {
+    if (getTransportChannelProvider()
+        .getTransportName()
+        .equals(GrpcTransportChannel.getGrpcTransportName())) {
+      return GrpcLoggingServiceV2Stub.create(this);
+    }
+    throw new UnsupportedOperationException(
+        String.format(
+            "Transport not supported: %s", getTransportChannelProvider().getTransportName()));
+  }
+
+  /** Returns a builder for the default ExecutorProvider for this service. */
+  public static InstantiatingExecutorProvider.Builder defaultExecutorProviderBuilder() {
+    return InstantiatingExecutorProvider.newBuilder();
+  }
+
+  /** Returns the default service endpoint. */
+  public static String getDefaultEndpoint() {
+    return "logging.googleapis.com:443";
+  }
+
+  /** Returns the default service scopes. */
+  public static List<String> getDefaultServiceScopes() {
+    return DEFAULT_SERVICE_SCOPES;
+  }
+
+  /** Returns a builder for the default credentials for this service. */
+  public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilder() {
+    return GoogleCredentialsProvider.newBuilder().setScopesToApply(DEFAULT_SERVICE_SCOPES);
+  }
+
+  /** Returns a builder for the default ChannelProvider for this service. */
+  public static InstantiatingGrpcChannelProvider.Builder defaultGrpcTransportProviderBuilder() {
+    return InstantiatingGrpcChannelProvider.newBuilder()
+        .setMaxInboundMessageSize(Integer.MAX_VALUE);
+  }
+
+  public static TransportChannelProvider defaultTransportChannelProvider() {
+    return defaultGrpcTransportProviderBuilder().build();
+  }
+
+  @BetaApi("The surface for customizing headers is not stable yet and may change in the future.")
+  public static ApiClientHeaderProvider.Builder defaultApiClientHeaderProviderBuilder() {
+    return ApiClientHeaderProvider.newBuilder()
+        .setGeneratedLibToken(
+            "gapic", GaxProperties.getLibraryVersion(LoggingServiceV2StubSettings.class))
+        .setTransportToken(
+            GaxGrpcProperties.getGrpcTokenName(), GaxGrpcProperties.getGrpcVersion());
+  }
+
+  /** Returns a new builder for this class. */
+  public static Builder newBuilder() {
+    return Builder.createDefault();
+  }
+
+  /** Returns a new builder for this class. */
+  public static Builder newBuilder(ClientContext clientContext) {
+    return new Builder(clientContext);
+  }
+
+  /** Returns a builder containing all the values of this settings class. */
+  public Builder toBuilder() {
+    return new Builder(this);
+  }
+
+  protected LoggingServiceV2StubSettings(Builder settingsBuilder) throws IOException {
+    super(settingsBuilder);
+    deleteLogSettings = settingsBuilder.deleteLogSettings().build();
+    writeLogEntriesSettings = settingsBuilder.writeLogEntriesSettings().build();
+    listLogEntriesSettings = settingsBuilder.listLogEntriesSettings().build();
+    listMonitoredResourceDescriptorsSettings =
+        settingsBuilder.listMonitoredResourceDescriptorsSettings().build();
+    listLogsSettings = settingsBuilder.listLogsSettings().build();
+  }
+
+  /** Builder for LoggingServiceV2StubSettings. */
+  public static class Builder extends StubSettings.Builder<LoggingServiceV2StubSettings, Builder> {
+    private final ImmutableList<UnaryCallSettings.Builder<?, ?>> unaryMethodSettingsBuilders;
+    private final UnaryCallSettings.Builder<DeleteLogRequest, Empty> deleteLogSettings;
+    private final BatchingCallSettings.Builder<WriteLogEntriesRequest, WriteLogEntriesResponse>
+        writeLogEntriesSettings;
+    private final PagedCallSettings.Builder<
+            ListLogEntriesRequest, ListLogEntriesResponse, ListLogEntriesPagedResponse>
+        listLogEntriesSettings;
+    private final PagedCallSettings.Builder<
+            ListMonitoredResourceDescriptorsRequest,
+            ListMonitoredResourceDescriptorsResponse,
+            ListMonitoredResourceDescriptorsPagedResponse>
+        listMonitoredResourceDescriptorsSettings;
+    private final PagedCallSettings.Builder<
+            ListLogsRequest, ListLogsResponse, ListLogsPagedResponse>
+        listLogsSettings;
+    private static final ImmutableMap<String, ImmutableSet<StatusCode.Code>>
+        RETRYABLE_CODE_DEFINITIONS;
+
+    static {
+      ImmutableMap.Builder<String, ImmutableSet<StatusCode.Code>> definitions =
+          ImmutableMap.builder();
+      definitions.put(
+          "retry_policy_1_codes",
+          ImmutableSet.copyOf(
+              Lists.<StatusCode.Code>newArrayList(
+                  StatusCode.Code.DEADLINE_EXCEEDED,
+                  StatusCode.Code.INTERNAL,
+                  StatusCode.Code.UNAVAILABLE)));
+      RETRYABLE_CODE_DEFINITIONS = definitions.build();
+    }
+
+    private static final ImmutableMap<String, RetrySettings> RETRY_PARAM_DEFINITIONS;
+
+    static {
+      ImmutableMap.Builder<String, RetrySettings> definitions = ImmutableMap.builder();
+      RetrySettings settings = null;
+      settings =
+          RetrySettings.newBuilder()
+              .setInitialRetryDelay(Duration.ofMillis(100L))
+              .setRetryDelayMultiplier(1.3)
+              .setMaxRetryDelay(Duration.ofMillis(60000L))
+              .setInitialRpcTimeout(Duration.ofMillis(60000L))
+              .setRpcTimeoutMultiplier(1.0)
+              .setMaxRpcTimeout(Duration.ofMillis(60000L))
+              .setTotalTimeout(Duration.ofMillis(60000L))
+              .build();
+      definitions.put("retry_policy_1_params", settings);
+      RETRY_PARAM_DEFINITIONS = definitions.build();
+    }
+
+    protected Builder() {
+      this(((ClientContext) null));
+    }
+
+    protected Builder(ClientContext clientContext) {
+      super(clientContext);
+      deleteLogSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();
+      writeLogEntriesSettings =
+          BatchingCallSettings.newBuilder(WRITE_LOG_ENTRIES_BATCHING_DESC)
+              .setBatchingSettings(BatchingSettings.newBuilder().build());
+      listLogEntriesSettings = PagedCallSettings.newBuilder(LIST_LOG_ENTRIES_PAGE_STR_FACT);
+      listMonitoredResourceDescriptorsSettings =
+          PagedCallSettings.newBuilder(LIST_MONITORED_RESOURCE_DESCRIPTORS_PAGE_STR_FACT);
+      listLogsSettings = PagedCallSettings.newBuilder(LIST_LOGS_PAGE_STR_FACT);
+      unaryMethodSettingsBuilders =
+          ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(
+              deleteLogSettings,
+              writeLogEntriesSettings,
+              listLogEntriesSettings,
+              listMonitoredResourceDescriptorsSettings,
+              listLogsSettings);
+      initDefaults(this);
+    }
+
+    protected Builder(LoggingServiceV2StubSettings settings) {
+      super(settings);
+      deleteLogSettings = settings.deleteLogSettings.toBuilder();
+      writeLogEntriesSettings = settings.writeLogEntriesSettings.toBuilder();
+      listLogEntriesSettings = settings.listLogEntriesSettings.toBuilder();
+      listMonitoredResourceDescriptorsSettings =
+          settings.listMonitoredResourceDescriptorsSettings.toBuilder();
+      listLogsSettings = settings.listLogsSettings.toBuilder();
+      unaryMethodSettingsBuilders =
+          ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(
+              deleteLogSettings,
+              writeLogEntriesSettings,
+              listLogEntriesSettings,
+              listMonitoredResourceDescriptorsSettings,
+              listLogsSettings);
+    }
+
+    private static Builder createDefault() {
+      Builder builder = new Builder(((ClientContext) null));
+      builder.setTransportChannelProvider(defaultTransportChannelProvider());
+      builder.setCredentialsProvider(defaultCredentialsProviderBuilder().build());
+      builder.setInternalHeaderProvider(defaultApiClientHeaderProviderBuilder().build());
+      builder.setEndpoint(getDefaultEndpoint());
+      return initDefaults(builder);
+    }
+
+    private static Builder initDefaults(Builder builder) {
+      builder
+          .deleteLogSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_1_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_1_params"));
+      builder
+          .writeLogEntriesSettings()
+          .setBatchingSettings(
+              BatchingSettings.newBuilder()
+                  .setElementCountThreshold(1000L)
+                  .setRequestByteThreshold(1048576L)
+                  .setDelayThreshold(Duration.ofMillis(50L))
+                  .setFlowControlSettings(
+                      FlowControlSettings.newBuilder()
+                          .setMaxOutstandingElementCount(100000L)
+                          .setMaxOutstandingRequestBytes(10485760L)
+                          .setLimitExceededBehavior(
+                              FlowController.LimitExceededBehavior.ThrowException)
+                          .build())
+                  .build());
+      builder
+          .writeLogEntriesSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_1_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_1_params"));
+      builder
+          .listLogEntriesSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_1_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_1_params"));
+      builder
+          .listMonitoredResourceDescriptorsSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_1_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_1_params"));
+      builder
+          .listLogsSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_1_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_1_params"));
+      return builder;
+    }
+
+    // NEXT_MAJOR_VER: remove 'throws Exception'.
+    /**
+     * Applies the given settings updater function to all of the unary API methods in this service.
+     *
+     * <p>Note: This method does not support applying settings to streaming methods.
+     */
+    public Builder applyToAllUnaryMethods(
+        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) throws Exception {
+      super.applyToAllUnaryMethods(unaryMethodSettingsBuilders, settingsUpdater);
+      return this;
+    }
+
+    public ImmutableList<UnaryCallSettings.Builder<?, ?>> unaryMethodSettingsBuilders() {
+      return unaryMethodSettingsBuilders;
+    }
+
+    /** Returns the builder for the settings used for calls to deleteLog. */
+    public UnaryCallSettings.Builder<DeleteLogRequest, Empty> deleteLogSettings() {
+      return deleteLogSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to writeLogEntries. */
+    public BatchingCallSettings.Builder<WriteLogEntriesRequest, WriteLogEntriesResponse>
+        writeLogEntriesSettings() {
+      return writeLogEntriesSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to listLogEntries. */
+    public PagedCallSettings.Builder<
+            ListLogEntriesRequest, ListLogEntriesResponse, ListLogEntriesPagedResponse>
+        listLogEntriesSettings() {
+      return listLogEntriesSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to listMonitoredResourceDescriptors. */
+    public PagedCallSettings.Builder<
+            ListMonitoredResourceDescriptorsRequest,
+            ListMonitoredResourceDescriptorsResponse,
+            ListMonitoredResourceDescriptorsPagedResponse>
+        listMonitoredResourceDescriptorsSettings() {
+      return listMonitoredResourceDescriptorsSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to listLogs. */
+    public PagedCallSettings.Builder<ListLogsRequest, ListLogsResponse, ListLogsPagedResponse>
+        listLogsSettings() {
+      return listLogsSettings;
+    }
+
+    @Override
+    public LoggingServiceV2StubSettings build() throws IOException {
+      return new LoggingServiceV2StubSettings(this);
+    }
+  }
+}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/MockEcho.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/MockEcho.golden
new file mode 100644
index 0000000000..57c735b964
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/MockEcho.golden
@@ -0,0 +1,43 @@
+package com.google.showcase.v1beta1;
+
+import com.google.api.core.BetaApi;
+import com.google.api.gax.grpc.testing.MockGrpcService;
+import com.google.protobuf.AbstractMessage;
+import io.grpc.ServerServiceDefinition;
+import java.util.List;
+import javax.annotation.Generated;
+
+@BetaApi
+@Generated("by gapic-generator-java")
+public class MockEcho implements MockGrpcService {
+  private final MockEchoImpl serviceImpl;
+
+  public MockEcho() {
+    serviceImpl = new MockEchoImpl();
+  }
+
+  @Override
+  public List<AbstractMessage> getRequests() {
+    return serviceImpl.getRequests();
+  }
+
+  @Override
+  public void addResponse(AbstractMessage response) {
+    serviceImpl.addResponse(response);
+  }
+
+  @Override
+  public void addException(Exception exception) {
+    serviceImpl.addException(exception);
+  }
+
+  @Override
+  public ServerServiceDefinition getServiceDefinition() {
+    return serviceImpl.bindService();
+  }
+
+  @Override
+  public void reset() {
+    serviceImpl.reset();
+  }
+}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/MockEchoImpl.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/MockEchoImpl.golden
new file mode 100644
index 0000000000..e3652b66d8
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/MockEchoImpl.golden
@@ -0,0 +1,207 @@
+package com.google.showcase.v1beta1;
+
+import com.google.api.core.BetaApi;
+import com.google.longrunning.Operation;
+import com.google.protobuf.AbstractMessage;
+import com.google.showcase.v1beta1.EchoGrpc.EchoImplBase;
+import io.grpc.stub.StreamObserver;
+import java.util.ArrayList;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Queue;
+import javax.annotation.Generated;
+
+@BetaApi
+@Generated("by gapic-generator-java")
+public class MockEchoImpl extends EchoImplBase {
+  private List<AbstractMessage> requests;
+  private Queue<Object> responses;
+
+  public MockEchoImpl() {
+    requests = new ArrayList<>();
+    responses = new LinkedList<>();
+  }
+
+  public List<AbstractMessage> getRequests() {
+    return requests;
+  }
+
+  public void addResponse(AbstractMessage response) {
+    responses.add(response);
+  }
+
+  public void setResponses(List<AbstractMessage> responses) {
+    this.responses = new LinkedList<Object>(responses);
+  }
+
+  public void addException(Exception exception) {
+    responses.add(exception);
+  }
+
+  public void reset() {
+    requests = new ArrayList<>();
+    responses = new LinkedList<>();
+  }
+
+  @Override
+  public void echo(EchoRequest request, StreamObserver<EchoResponse> responseObserver) {
+    Object response = responses.remove();
+    if (response instanceof EchoResponse) {
+      requests.add(request);
+      responseObserver.onNext(((EchoResponse) response));
+      responseObserver.onCompleted();
+    } else if (response instanceof Exception) {
+      responseObserver.onError(((Exception) response));
+    } else {
+      responseObserver.onError(new IllegalArgumentException("Unrecognized response type"));
+    }
+  }
+
+  @Override
+  public void expand(ExpandRequest request, StreamObserver<EchoResponse> responseObserver) {
+    Object response = responses.remove();
+    if (response instanceof EchoResponse) {
+      requests.add(request);
+      responseObserver.onNext(((EchoResponse) response));
+      responseObserver.onCompleted();
+    } else if (response instanceof Exception) {
+      responseObserver.onError(((Exception) response));
+    } else {
+      responseObserver.onError(new IllegalArgumentException("Unrecognized response type"));
+    }
+  }
+
+  @Override
+  public StreamObserver<EchoRequest> collect(final StreamObserver<EchoResponse> responseObserver) {
+    StreamObserver<EchoRequest> requestObserver =
+        new StreamObserver<EchoRequest>() {
+          @Override
+          public void onNext(EchoRequest value) {
+            requests.add(value);
+            final Object response = responses.remove();
+            if (response instanceof EchoResponse) {
+              responseObserver.onNext(((EchoResponse) response));
+            } else if (response instanceof Exception) {
+              responseObserver.onError(((Exception) response));
+            } else {
+              responseObserver.onError(new IllegalArgumentException("Unrecognized response type"));
+            }
+          }
+
+          @Override
+          public void onError(Throwable t) {
+            responseObserver.onError(t);
+          }
+
+          @Override
+          public void onCompleted() {
+            responseObserver.onCompleted();
+          }
+        };
+    return requestObserver;
+  }
+
+  @Override
+  public StreamObserver<EchoRequest> chat(final StreamObserver<EchoResponse> responseObserver) {
+    StreamObserver<EchoRequest> requestObserver =
+        new StreamObserver<EchoRequest>() {
+          @Override
+          public void onNext(EchoRequest value) {
+            requests.add(value);
+            final Object response = responses.remove();
+            if (response instanceof EchoResponse) {
+              responseObserver.onNext(((EchoResponse) response));
+            } else if (response instanceof Exception) {
+              responseObserver.onError(((Exception) response));
+            } else {
+              responseObserver.onError(new IllegalArgumentException("Unrecognized response type"));
+            }
+          }
+
+          @Override
+          public void onError(Throwable t) {
+            responseObserver.onError(t);
+          }
+
+          @Override
+          public void onCompleted() {
+            responseObserver.onCompleted();
+          }
+        };
+    return requestObserver;
+  }
+
+  @Override
+  public StreamObserver<EchoRequest> chatAgain(
+      final StreamObserver<EchoResponse> responseObserver) {
+    StreamObserver<EchoRequest> requestObserver =
+        new StreamObserver<EchoRequest>() {
+          @Override
+          public void onNext(EchoRequest value) {
+            requests.add(value);
+            final Object response = responses.remove();
+            if (response instanceof EchoResponse) {
+              responseObserver.onNext(((EchoResponse) response));
+            } else if (response instanceof Exception) {
+              responseObserver.onError(((Exception) response));
+            } else {
+              responseObserver.onError(new IllegalArgumentException("Unrecognized response type"));
+            }
+          }
+
+          @Override
+          public void onError(Throwable t) {
+            responseObserver.onError(t);
+          }
+
+          @Override
+          public void onCompleted() {
+            responseObserver.onCompleted();
+          }
+        };
+    return requestObserver;
+  }
+
+  @Override
+  public void pagedExpand(
+      PagedExpandRequest request, StreamObserver<PagedExpandResponse> responseObserver) {
+    Object response = responses.remove();
+    if (response instanceof PagedExpandResponse) {
+      requests.add(request);
+      responseObserver.onNext(((PagedExpandResponse) response));
+      responseObserver.onCompleted();
+    } else if (response instanceof Exception) {
+      responseObserver.onError(((Exception) response));
+    } else {
+      responseObserver.onError(new IllegalArgumentException("Unrecognized response type"));
+    }
+  }
+
+  @Override
+  public void wait(WaitRequest request, StreamObserver<Operation> responseObserver) {
+    Object response = responses.remove();
+    if (response instanceof Operation) {
+      requests.add(request);
+      responseObserver.onNext(((Operation) response));
+      responseObserver.onCompleted();
+    } else if (response instanceof Exception) {
+      responseObserver.onError(((Exception) response));
+    } else {
+      responseObserver.onError(new IllegalArgumentException("Unrecognized response type"));
+    }
+  }
+
+  @Override
+  public void block(BlockRequest request, StreamObserver<BlockResponse> responseObserver) {
+    Object response = responses.remove();
+    if (response instanceof BlockResponse) {
+      requests.add(request);
+      responseObserver.onNext(((BlockResponse) response));
+      responseObserver.onCompleted();
+    } else if (response instanceof Exception) {
+      responseObserver.onError(((Exception) response));
+    } else {
+      responseObserver.onError(new IllegalArgumentException("Unrecognized response type"));
+    }
+  }
+}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/PublisherStubSettings.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/PublisherStubSettings.golden
new file mode 100644
index 0000000000..67404721a9
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/PublisherStubSettings.golden
@@ -0,0 +1,758 @@
+package com.google.pubsub.v1.stub;
+
+import static com.google.pubsub.v1.PublisherClient.ListTopicSnapshotsPagedResponse;
+import static com.google.pubsub.v1.PublisherClient.ListTopicSubscriptionsPagedResponse;
+import static com.google.pubsub.v1.PublisherClient.ListTopicsPagedResponse;
+
+import com.google.api.core.ApiFunction;
+import com.google.api.core.ApiFuture;
+import com.google.api.core.BetaApi;
+import com.google.api.gax.batching.BatchingSettings;
+import com.google.api.gax.batching.FlowControlSettings;
+import com.google.api.gax.batching.FlowController;
+import com.google.api.gax.batching.PartitionKey;
+import com.google.api.gax.batching.RequestBuilder;
+import com.google.api.gax.core.GaxProperties;
+import com.google.api.gax.core.GoogleCredentialsProvider;
+import com.google.api.gax.core.InstantiatingExecutorProvider;
+import com.google.api.gax.grpc.GaxGrpcProperties;
+import com.google.api.gax.grpc.GrpcTransportChannel;
+import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;
+import com.google.api.gax.retrying.RetrySettings;
+import com.google.api.gax.rpc.ApiCallContext;
+import com.google.api.gax.rpc.ApiClientHeaderProvider;
+import com.google.api.gax.rpc.BatchedRequestIssuer;
+import com.google.api.gax.rpc.BatchingCallSettings;
+import com.google.api.gax.rpc.BatchingDescriptor;
+import com.google.api.gax.rpc.ClientContext;
+import com.google.api.gax.rpc.PageContext;
+import com.google.api.gax.rpc.PagedCallSettings;
+import com.google.api.gax.rpc.PagedListDescriptor;
+import com.google.api.gax.rpc.PagedListResponseFactory;
+import com.google.api.gax.rpc.StatusCode;
+import com.google.api.gax.rpc.StubSettings;
+import com.google.api.gax.rpc.TransportChannelProvider;
+import com.google.api.gax.rpc.UnaryCallSettings;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Lists;
+import com.google.protobuf.Empty;
+import com.google.pubsub.v1.DeleteTopicRequest;
+import com.google.pubsub.v1.DetachSubscriptionRequest;
+import com.google.pubsub.v1.DetachSubscriptionResponse;
+import com.google.pubsub.v1.GetTopicRequest;
+import com.google.pubsub.v1.ListTopicSnapshotsRequest;
+import com.google.pubsub.v1.ListTopicSnapshotsResponse;
+import com.google.pubsub.v1.ListTopicSubscriptionsRequest;
+import com.google.pubsub.v1.ListTopicSubscriptionsResponse;
+import com.google.pubsub.v1.ListTopicsRequest;
+import com.google.pubsub.v1.ListTopicsResponse;
+import com.google.pubsub.v1.PublishRequest;
+import com.google.pubsub.v1.PublishResponse;
+import com.google.pubsub.v1.Topic;
+import com.google.pubsub.v1.UpdateTopicRequest;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Objects;
+import javax.annotation.Generated;
+import org.threeten.bp.Duration;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * Settings class to configure an instance of {@link PublisherStub}.
+ *
+ * <p>The default instance has everything set to sensible defaults:
+ *
+ * <ul>
+ *   <li>The default service address (pubsub.googleapis.com) and default port (443) are used.
+ *   <li>Credentials are acquired automatically through Application Default Credentials.
+ *   <li>Retries are configured for idempotent methods but not for non-idempotent methods.
+ * </ul>
+ *
+ * <p>The builder of this class is recursive, so contained classes are themselves builders. When
+ * build() is called, the tree of builders is called to create the complete settings object.
+ *
+ * <p>For example, to set the total timeout of createTopic to 30 seconds:
+ */
+@BetaApi
+@Generated("by gapic-generator-java")
+public class PublisherStubSettings extends StubSettings<PublisherStubSettings> {
+  /** The default scopes of the service. */
+  private static final ImmutableList<String> DEFAULT_SERVICE_SCOPES =
+      ImmutableList.<String>builder()
+          .add("https://www.googleapis.com/auth/cloud-platform")
+          .add("https://www.googleapis.com/auth/pubsub")
+          .build();
+
+  private final UnaryCallSettings<Topic, Topic> createTopicSettings;
+  private final UnaryCallSettings<UpdateTopicRequest, Topic> updateTopicSettings;
+  private final BatchingCallSettings<PublishRequest, PublishResponse> publishSettings;
+  private final UnaryCallSettings<GetTopicRequest, Topic> getTopicSettings;
+  private final PagedCallSettings<ListTopicsRequest, ListTopicsResponse, ListTopicsPagedResponse>
+      listTopicsSettings;
+  private final PagedCallSettings<
+          ListTopicSubscriptionsRequest,
+          ListTopicSubscriptionsResponse,
+          ListTopicSubscriptionsPagedResponse>
+      listTopicSubscriptionsSettings;
+  private final PagedCallSettings<
+          ListTopicSnapshotsRequest, ListTopicSnapshotsResponse, ListTopicSnapshotsPagedResponse>
+      listTopicSnapshotsSettings;
+  private final UnaryCallSettings<DeleteTopicRequest, Empty> deleteTopicSettings;
+  private final UnaryCallSettings<DetachSubscriptionRequest, DetachSubscriptionResponse>
+      detachSubscriptionSettings;
+  private static final PagedListDescriptor<ListTopicsRequest, ListTopicsResponse, Topic>
+      LIST_TOPICS_PAGE_STR_DESC =
+          new PagedListDescriptor<ListTopicsRequest, ListTopicsResponse, Topic>() {
+            @Override
+            public String emptyToken() {
+              return "";
+            }
+
+            @Override
+            public ListTopicsRequest injectToken(ListTopicsRequest payload, String token) {
+              return ListTopicsRequest.newBuilder(payload).setPageToken(token).build();
+            }
+
+            @Override
+            public ListTopicsRequest injectPageSize(ListTopicsRequest payload, int pageSize) {
+              return ListTopicsRequest.newBuilder(payload).setPageSize(pageSize).build();
+            }
+
+            @Override
+            public Integer extractPageSize(ListTopicsRequest payload) {
+              return payload.getPageSize();
+            }
+
+            @Override
+            public String extractNextToken(ListTopicsResponse payload) {
+              return payload.getNextPageToken();
+            }
+
+            @Override
+            public Iterable<Topic> extractResources(ListTopicsResponse payload) {
+              return Objects.isNull(payload.getTopicsList())
+                  ? ImmutableList.<Topic>of()
+                  : payload.getTopicsList();
+            }
+          };
+  private static final PagedListDescriptor<
+          ListTopicSubscriptionsRequest, ListTopicSubscriptionsResponse, String>
+      LIST_TOPIC_SUBSCRIPTIONS_PAGE_STR_DESC =
+          new PagedListDescriptor<
+              ListTopicSubscriptionsRequest, ListTopicSubscriptionsResponse, String>() {
+            @Override
+            public String emptyToken() {
+              return "";
+            }
+
+            @Override
+            public ListTopicSubscriptionsRequest injectToken(
+                ListTopicSubscriptionsRequest payload, String token) {
+              return ListTopicSubscriptionsRequest.newBuilder(payload).setPageToken(token).build();
+            }
+
+            @Override
+            public ListTopicSubscriptionsRequest injectPageSize(
+                ListTopicSubscriptionsRequest payload, int pageSize) {
+              return ListTopicSubscriptionsRequest.newBuilder(payload)
+                  .setPageSize(pageSize)
+                  .build();
+            }
+
+            @Override
+            public Integer extractPageSize(ListTopicSubscriptionsRequest payload) {
+              return payload.getPageSize();
+            }
+
+            @Override
+            public String extractNextToken(ListTopicSubscriptionsResponse payload) {
+              return payload.getNextPageToken();
+            }
+
+            @Override
+            public Iterable<String> extractResources(ListTopicSubscriptionsResponse payload) {
+              return Objects.isNull(payload.getSubscriptionsList())
+                  ? ImmutableList.<String>of()
+                  : payload.getSubscriptionsList();
+            }
+          };
+  private static final PagedListDescriptor<
+          ListTopicSnapshotsRequest, ListTopicSnapshotsResponse, String>
+      LIST_TOPIC_SNAPSHOTS_PAGE_STR_DESC =
+          new PagedListDescriptor<ListTopicSnapshotsRequest, ListTopicSnapshotsResponse, String>() {
+            @Override
+            public String emptyToken() {
+              return "";
+            }
+
+            @Override
+            public ListTopicSnapshotsRequest injectToken(
+                ListTopicSnapshotsRequest payload, String token) {
+              return ListTopicSnapshotsRequest.newBuilder(payload).setPageToken(token).build();
+            }
+
+            @Override
+            public ListTopicSnapshotsRequest injectPageSize(
+                ListTopicSnapshotsRequest payload, int pageSize) {
+              return ListTopicSnapshotsRequest.newBuilder(payload).setPageSize(pageSize).build();
+            }
+
+            @Override
+            public Integer extractPageSize(ListTopicSnapshotsRequest payload) {
+              return payload.getPageSize();
+            }
+
+            @Override
+            public String extractNextToken(ListTopicSnapshotsResponse payload) {
+              return payload.getNextPageToken();
+            }
+
+            @Override
+            public Iterable<String> extractResources(ListTopicSnapshotsResponse payload) {
+              return Objects.isNull(payload.getSnapshotsList())
+                  ? ImmutableList.<String>of()
+                  : payload.getSnapshotsList();
+            }
+          };
+  private static final PagedListResponseFactory<
+          ListTopicsRequest, ListTopicsResponse, ListTopicsPagedResponse>
+      LIST_TOPICS_PAGE_STR_FACT =
+          new PagedListResponseFactory<
+              ListTopicsRequest, ListTopicsResponse, ListTopicsPagedResponse>() {
+            @Override
+            public ApiFuture<ListTopicsPagedResponse> getFuturePagedResponse(
+                UnaryCallable<ListTopicsRequest, ListTopicsResponse> callable,
+                ListTopicsRequest request,
+                ApiCallContext context,
+                ApiFuture<ListTopicsResponse> futureResponse) {
+              PageContext<ListTopicsRequest, ListTopicsResponse, Topic> pageContext =
+                  PageContext.create(callable, LIST_TOPICS_PAGE_STR_DESC, request, context);
+              return ListTopicsPagedResponse.createAsync(pageContext, futureResponse);
+            }
+          };
+  private static final PagedListResponseFactory<
+          ListTopicSubscriptionsRequest,
+          ListTopicSubscriptionsResponse,
+          ListTopicSubscriptionsPagedResponse>
+      LIST_TOPIC_SUBSCRIPTIONS_PAGE_STR_FACT =
+          new PagedListResponseFactory<
+              ListTopicSubscriptionsRequest,
+              ListTopicSubscriptionsResponse,
+              ListTopicSubscriptionsPagedResponse>() {
+            @Override
+            public ApiFuture<ListTopicSubscriptionsPagedResponse> getFuturePagedResponse(
+                UnaryCallable<ListTopicSubscriptionsRequest, ListTopicSubscriptionsResponse>
+                    callable,
+                ListTopicSubscriptionsRequest request,
+                ApiCallContext context,
+                ApiFuture<ListTopicSubscriptionsResponse> futureResponse) {
+              PageContext<ListTopicSubscriptionsRequest, ListTopicSubscriptionsResponse, String>
+                  pageContext =
+                      PageContext.create(
+                          callable, LIST_TOPIC_SUBSCRIPTIONS_PAGE_STR_DESC, request, context);
+              return ListTopicSubscriptionsPagedResponse.createAsync(pageContext, futureResponse);
+            }
+          };
+  private static final PagedListResponseFactory<
+          ListTopicSnapshotsRequest, ListTopicSnapshotsResponse, ListTopicSnapshotsPagedResponse>
+      LIST_TOPIC_SNAPSHOTS_PAGE_STR_FACT =
+          new PagedListResponseFactory<
+              ListTopicSnapshotsRequest,
+              ListTopicSnapshotsResponse,
+              ListTopicSnapshotsPagedResponse>() {
+            @Override
+            public ApiFuture<ListTopicSnapshotsPagedResponse> getFuturePagedResponse(
+                UnaryCallable<ListTopicSnapshotsRequest, ListTopicSnapshotsResponse> callable,
+                ListTopicSnapshotsRequest request,
+                ApiCallContext context,
+                ApiFuture<ListTopicSnapshotsResponse> futureResponse) {
+              PageContext<ListTopicSnapshotsRequest, ListTopicSnapshotsResponse, String>
+                  pageContext =
+                      PageContext.create(
+                          callable, LIST_TOPIC_SNAPSHOTS_PAGE_STR_DESC, request, context);
+              return ListTopicSnapshotsPagedResponse.createAsync(pageContext, futureResponse);
+            }
+          };
+  private static final BatchingDescriptor<PublishRequest, PublishResponse> PUBLISH_BATCHING_DESC =
+      new BatchingDescriptor<PublishRequest, PublishResponse>() {
+        @Override
+        public PartitionKey getBatchPartitionKey(PublishRequest request) {
+          return new PartitionKey(request.getTopic());
+        }
+
+        @Override
+        public RequestBuilder<PublishRequest> getRequestBuilder() {
+          return new RequestBuilder<PublishRequest>() {
+            private PublishRequest.Builder builder;
+
+            @Override
+            public void appendRequest(PublishRequest request) {
+              if (Objects.isNull(builder)) {
+                builder = request.toBuilder();
+              } else {
+                builder.addAllMessages(request.getMessagesList());
+              }
+            }
+
+            @Override
+            public PublishRequest build() {
+              return builder.build();
+            }
+          };
+        }
+
+        @Override
+        public void splitResponse(
+            PublishResponse batchResponse,
+            Collection<? extends BatchedRequestIssuer<PublishResponse>> batch) {
+          int batchMessageIndex = 0;
+          for (BatchedRequestIssuer<PublishResponse> responder : batch) {
+            List<String> subresponseElements = new ArrayList<>();
+            long subresponseCount = responder.getMessageCount();
+            for (int i = 0; i < subresponseCount; i++) {
+              subresponseElements.add(batchResponse.getMessageIds(batchMessageIndex++));
+            }
+            PublishResponse response =
+                PublishResponse.newBuilder().addAllMessageIds(subresponseElements).build();
+            responder.setResponse(response);
+          }
+        }
+
+        @Override
+        public void splitException(
+            Throwable throwable,
+            Collection<? extends BatchedRequestIssuer<PublishResponse>> batch) {
+          for (BatchedRequestIssuer<PublishResponse> responder : batch) {
+            responder.setException(throwable);
+          }
+        }
+
+        @Override
+        public long countElements(PublishRequest request) {
+          return request.getMessagesCount();
+        }
+
+        @Override
+        public long countBytes(PublishRequest request) {
+          return request.getSerializedSize();
+        }
+      };
+
+  /** Returns the object with the settings used for calls to createTopic. */
+  public UnaryCallSettings<Topic, Topic> createTopicSettings() {
+    return createTopicSettings;
+  }
+
+  /** Returns the object with the settings used for calls to updateTopic. */
+  public UnaryCallSettings<UpdateTopicRequest, Topic> updateTopicSettings() {
+    return updateTopicSettings;
+  }
+
+  /** Returns the object with the settings used for calls to publish. */
+  public BatchingCallSettings<PublishRequest, PublishResponse> publishSettings() {
+    return publishSettings;
+  }
+
+  /** Returns the object with the settings used for calls to getTopic. */
+  public UnaryCallSettings<GetTopicRequest, Topic> getTopicSettings() {
+    return getTopicSettings;
+  }
+
+  /** Returns the object with the settings used for calls to listTopics. */
+  public PagedCallSettings<ListTopicsRequest, ListTopicsResponse, ListTopicsPagedResponse>
+      listTopicsSettings() {
+    return listTopicsSettings;
+  }
+
+  /** Returns the object with the settings used for calls to listTopicSubscriptions. */
+  public PagedCallSettings<
+          ListTopicSubscriptionsRequest,
+          ListTopicSubscriptionsResponse,
+          ListTopicSubscriptionsPagedResponse>
+      listTopicSubscriptionsSettings() {
+    return listTopicSubscriptionsSettings;
+  }
+
+  /** Returns the object with the settings used for calls to listTopicSnapshots. */
+  public PagedCallSettings<
+          ListTopicSnapshotsRequest, ListTopicSnapshotsResponse, ListTopicSnapshotsPagedResponse>
+      listTopicSnapshotsSettings() {
+    return listTopicSnapshotsSettings;
+  }
+
+  /** Returns the object with the settings used for calls to deleteTopic. */
+  public UnaryCallSettings<DeleteTopicRequest, Empty> deleteTopicSettings() {
+    return deleteTopicSettings;
+  }
+
+  /** Returns the object with the settings used for calls to detachSubscription. */
+  public UnaryCallSettings<DetachSubscriptionRequest, DetachSubscriptionResponse>
+      detachSubscriptionSettings() {
+    return detachSubscriptionSettings;
+  }
+
+  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
+  public PublisherStub createStub() throws IOException {
+    if (getTransportChannelProvider()
+        .getTransportName()
+        .equals(GrpcTransportChannel.getGrpcTransportName())) {
+      return GrpcPublisherStub.create(this);
+    }
+    throw new UnsupportedOperationException(
+        String.format(
+            "Transport not supported: %s", getTransportChannelProvider().getTransportName()));
+  }
+
+  /** Returns a builder for the default ExecutorProvider for this service. */
+  public static InstantiatingExecutorProvider.Builder defaultExecutorProviderBuilder() {
+    return InstantiatingExecutorProvider.newBuilder();
+  }
+
+  /** Returns the default service endpoint. */
+  public static String getDefaultEndpoint() {
+    return "pubsub.googleapis.com:443";
+  }
+
+  /** Returns the default service scopes. */
+  public static List<String> getDefaultServiceScopes() {
+    return DEFAULT_SERVICE_SCOPES;
+  }
+
+  /** Returns a builder for the default credentials for this service. */
+  public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilder() {
+    return GoogleCredentialsProvider.newBuilder().setScopesToApply(DEFAULT_SERVICE_SCOPES);
+  }
+
+  /** Returns a builder for the default ChannelProvider for this service. */
+  public static InstantiatingGrpcChannelProvider.Builder defaultGrpcTransportProviderBuilder() {
+    return InstantiatingGrpcChannelProvider.newBuilder()
+        .setMaxInboundMessageSize(Integer.MAX_VALUE);
+  }
+
+  public static TransportChannelProvider defaultTransportChannelProvider() {
+    return defaultGrpcTransportProviderBuilder().build();
+  }
+
+  @BetaApi("The surface for customizing headers is not stable yet and may change in the future.")
+  public static ApiClientHeaderProvider.Builder defaultApiClientHeaderProviderBuilder() {
+    return ApiClientHeaderProvider.newBuilder()
+        .setGeneratedLibToken("gapic", GaxProperties.getLibraryVersion(PublisherStubSettings.class))
+        .setTransportToken(
+            GaxGrpcProperties.getGrpcTokenName(), GaxGrpcProperties.getGrpcVersion());
+  }
+
+  /** Returns a new builder for this class. */
+  public static Builder newBuilder() {
+    return Builder.createDefault();
+  }
+
+  /** Returns a new builder for this class. */
+  public static Builder newBuilder(ClientContext clientContext) {
+    return new Builder(clientContext);
+  }
+
+  /** Returns a builder containing all the values of this settings class. */
+  public Builder toBuilder() {
+    return new Builder(this);
+  }
+
+  protected PublisherStubSettings(Builder settingsBuilder) throws IOException {
+    super(settingsBuilder);
+    createTopicSettings = settingsBuilder.createTopicSettings().build();
+    updateTopicSettings = settingsBuilder.updateTopicSettings().build();
+    publishSettings = settingsBuilder.publishSettings().build();
+    getTopicSettings = settingsBuilder.getTopicSettings().build();
+    listTopicsSettings = settingsBuilder.listTopicsSettings().build();
+    listTopicSubscriptionsSettings = settingsBuilder.listTopicSubscriptionsSettings().build();
+    listTopicSnapshotsSettings = settingsBuilder.listTopicSnapshotsSettings().build();
+    deleteTopicSettings = settingsBuilder.deleteTopicSettings().build();
+    detachSubscriptionSettings = settingsBuilder.detachSubscriptionSettings().build();
+  }
+
+  /** Builder for PublisherStubSettings. */
+  public static class Builder extends StubSettings.Builder<PublisherStubSettings, Builder> {
+    private final ImmutableList<UnaryCallSettings.Builder<?, ?>> unaryMethodSettingsBuilders;
+    private final UnaryCallSettings.Builder<Topic, Topic> createTopicSettings;
+    private final UnaryCallSettings.Builder<UpdateTopicRequest, Topic> updateTopicSettings;
+    private final BatchingCallSettings.Builder<PublishRequest, PublishResponse> publishSettings;
+    private final UnaryCallSettings.Builder<GetTopicRequest, Topic> getTopicSettings;
+    private final PagedCallSettings.Builder<
+            ListTopicsRequest, ListTopicsResponse, ListTopicsPagedResponse>
+        listTopicsSettings;
+    private final PagedCallSettings.Builder<
+            ListTopicSubscriptionsRequest,
+            ListTopicSubscriptionsResponse,
+            ListTopicSubscriptionsPagedResponse>
+        listTopicSubscriptionsSettings;
+    private final PagedCallSettings.Builder<
+            ListTopicSnapshotsRequest, ListTopicSnapshotsResponse, ListTopicSnapshotsPagedResponse>
+        listTopicSnapshotsSettings;
+    private final UnaryCallSettings.Builder<DeleteTopicRequest, Empty> deleteTopicSettings;
+    private final UnaryCallSettings.Builder<DetachSubscriptionRequest, DetachSubscriptionResponse>
+        detachSubscriptionSettings;
+    private static final ImmutableMap<String, ImmutableSet<StatusCode.Code>>
+        RETRYABLE_CODE_DEFINITIONS;
+
+    static {
+      ImmutableMap.Builder<String, ImmutableSet<StatusCode.Code>> definitions =
+          ImmutableMap.builder();
+      definitions.put(
+          "retry_policy_0_codes",
+          ImmutableSet.copyOf(Lists.<StatusCode.Code>newArrayList(StatusCode.Code.UNAVAILABLE)));
+      definitions.put(
+          "retry_policy_1_codes",
+          ImmutableSet.copyOf(
+              Lists.<StatusCode.Code>newArrayList(
+                  StatusCode.Code.ABORTED,
+                  StatusCode.Code.CANCELLED,
+                  StatusCode.Code.INTERNAL,
+                  StatusCode.Code.RESOURCE_EXHAUSTED,
+                  StatusCode.Code.UNKNOWN,
+                  StatusCode.Code.UNAVAILABLE,
+                  StatusCode.Code.DEADLINE_EXCEEDED)));
+      definitions.put(
+          "retry_policy_2_codes",
+          ImmutableSet.copyOf(
+              Lists.<StatusCode.Code>newArrayList(
+                  StatusCode.Code.UNKNOWN, StatusCode.Code.ABORTED, StatusCode.Code.UNAVAILABLE)));
+      RETRYABLE_CODE_DEFINITIONS = definitions.build();
+    }
+
+    private static final ImmutableMap<String, RetrySettings> RETRY_PARAM_DEFINITIONS;
+
+    static {
+      ImmutableMap.Builder<String, RetrySettings> definitions = ImmutableMap.builder();
+      RetrySettings settings = null;
+      settings =
+          RetrySettings.newBuilder()
+              .setInitialRetryDelay(Duration.ofMillis(100L))
+              .setRetryDelayMultiplier(1.3)
+              .setMaxRetryDelay(Duration.ofMillis(60000L))
+              .setInitialRpcTimeout(Duration.ofMillis(60000L))
+              .setRpcTimeoutMultiplier(1.0)
+              .setMaxRpcTimeout(Duration.ofMillis(60000L))
+              .setTotalTimeout(Duration.ofMillis(60000L))
+              .build();
+      definitions.put("retry_policy_0_params", settings);
+      settings =
+          RetrySettings.newBuilder()
+              .setInitialRetryDelay(Duration.ofMillis(100L))
+              .setRetryDelayMultiplier(1.3)
+              .setMaxRetryDelay(Duration.ofMillis(60000L))
+              .setInitialRpcTimeout(Duration.ofMillis(60000L))
+              .setRpcTimeoutMultiplier(1.0)
+              .setMaxRpcTimeout(Duration.ofMillis(60000L))
+              .setTotalTimeout(Duration.ofMillis(60000L))
+              .build();
+      definitions.put("retry_policy_1_params", settings);
+      settings =
+          RetrySettings.newBuilder()
+              .setInitialRetryDelay(Duration.ofMillis(100L))
+              .setRetryDelayMultiplier(1.3)
+              .setMaxRetryDelay(Duration.ofMillis(60000L))
+              .setInitialRpcTimeout(Duration.ofMillis(60000L))
+              .setRpcTimeoutMultiplier(1.0)
+              .setMaxRpcTimeout(Duration.ofMillis(60000L))
+              .setTotalTimeout(Duration.ofMillis(60000L))
+              .build();
+      definitions.put("retry_policy_2_params", settings);
+      RETRY_PARAM_DEFINITIONS = definitions.build();
+    }
+
+    protected Builder() {
+      this(((ClientContext) null));
+    }
+
+    protected Builder(ClientContext clientContext) {
+      super(clientContext);
+      createTopicSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();
+      updateTopicSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();
+      publishSettings =
+          BatchingCallSettings.newBuilder(PUBLISH_BATCHING_DESC)
+              .setBatchingSettings(BatchingSettings.newBuilder().build());
+      getTopicSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();
+      listTopicsSettings = PagedCallSettings.newBuilder(LIST_TOPICS_PAGE_STR_FACT);
+      listTopicSubscriptionsSettings =
+          PagedCallSettings.newBuilder(LIST_TOPIC_SUBSCRIPTIONS_PAGE_STR_FACT);
+      listTopicSnapshotsSettings = PagedCallSettings.newBuilder(LIST_TOPIC_SNAPSHOTS_PAGE_STR_FACT);
+      deleteTopicSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();
+      detachSubscriptionSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();
+      unaryMethodSettingsBuilders =
+          ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(
+              createTopicSettings,
+              updateTopicSettings,
+              publishSettings,
+              getTopicSettings,
+              listTopicsSettings,
+              listTopicSubscriptionsSettings,
+              listTopicSnapshotsSettings,
+              deleteTopicSettings,
+              detachSubscriptionSettings);
+      initDefaults(this);
+    }
+
+    protected Builder(PublisherStubSettings settings) {
+      super(settings);
+      createTopicSettings = settings.createTopicSettings.toBuilder();
+      updateTopicSettings = settings.updateTopicSettings.toBuilder();
+      publishSettings = settings.publishSettings.toBuilder();
+      getTopicSettings = settings.getTopicSettings.toBuilder();
+      listTopicsSettings = settings.listTopicsSettings.toBuilder();
+      listTopicSubscriptionsSettings = settings.listTopicSubscriptionsSettings.toBuilder();
+      listTopicSnapshotsSettings = settings.listTopicSnapshotsSettings.toBuilder();
+      deleteTopicSettings = settings.deleteTopicSettings.toBuilder();
+      detachSubscriptionSettings = settings.detachSubscriptionSettings.toBuilder();
+      unaryMethodSettingsBuilders =
+          ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(
+              createTopicSettings,
+              updateTopicSettings,
+              publishSettings,
+              getTopicSettings,
+              listTopicsSettings,
+              listTopicSubscriptionsSettings,
+              listTopicSnapshotsSettings,
+              deleteTopicSettings,
+              detachSubscriptionSettings);
+    }
+
+    private static Builder createDefault() {
+      Builder builder = new Builder(((ClientContext) null));
+      builder.setTransportChannelProvider(defaultTransportChannelProvider());
+      builder.setCredentialsProvider(defaultCredentialsProviderBuilder().build());
+      builder.setInternalHeaderProvider(defaultApiClientHeaderProviderBuilder().build());
+      builder.setEndpoint(getDefaultEndpoint());
+      return initDefaults(builder);
+    }
+
+    private static Builder initDefaults(Builder builder) {
+      builder
+          .createTopicSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_0_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_0_params"));
+      builder
+          .updateTopicSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_0_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_0_params"));
+      builder
+          .publishSettings()
+          .setBatchingSettings(
+              BatchingSettings.newBuilder()
+                  .setElementCountThreshold(100L)
+                  .setRequestByteThreshold(1048576L)
+                  .setDelayThreshold(Duration.ofMillis(10L))
+                  .setFlowControlSettings(
+                      FlowControlSettings.newBuilder()
+                          .setLimitExceededBehavior(FlowController.LimitExceededBehavior.Ignore)
+                          .build())
+                  .build());
+      builder
+          .publishSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_1_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_1_params"));
+      builder
+          .getTopicSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_2_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_2_params"));
+      builder
+          .listTopicsSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_2_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_2_params"));
+      builder
+          .listTopicSubscriptionsSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_2_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_2_params"));
+      builder
+          .listTopicSnapshotsSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_2_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_2_params"));
+      builder
+          .deleteTopicSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_0_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_0_params"));
+      builder
+          .detachSubscriptionSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_0_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_0_params"));
+      return builder;
+    }
+
+    // NEXT_MAJOR_VER: remove 'throws Exception'.
+    /**
+     * Applies the given settings updater function to all of the unary API methods in this service.
+     *
+     * <p>Note: This method does not support applying settings to streaming methods.
+     */
+    public Builder applyToAllUnaryMethods(
+        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) throws Exception {
+      super.applyToAllUnaryMethods(unaryMethodSettingsBuilders, settingsUpdater);
+      return this;
+    }
+
+    public ImmutableList<UnaryCallSettings.Builder<?, ?>> unaryMethodSettingsBuilders() {
+      return unaryMethodSettingsBuilders;
+    }
+
+    /** Returns the builder for the settings used for calls to createTopic. */
+    public UnaryCallSettings.Builder<Topic, Topic> createTopicSettings() {
+      return createTopicSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to updateTopic. */
+    public UnaryCallSettings.Builder<UpdateTopicRequest, Topic> updateTopicSettings() {
+      return updateTopicSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to publish. */
+    public BatchingCallSettings.Builder<PublishRequest, PublishResponse> publishSettings() {
+      return publishSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to getTopic. */
+    public UnaryCallSettings.Builder<GetTopicRequest, Topic> getTopicSettings() {
+      return getTopicSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to listTopics. */
+    public PagedCallSettings.Builder<ListTopicsRequest, ListTopicsResponse, ListTopicsPagedResponse>
+        listTopicsSettings() {
+      return listTopicsSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to listTopicSubscriptions. */
+    public PagedCallSettings.Builder<
+            ListTopicSubscriptionsRequest,
+            ListTopicSubscriptionsResponse,
+            ListTopicSubscriptionsPagedResponse>
+        listTopicSubscriptionsSettings() {
+      return listTopicSubscriptionsSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to listTopicSnapshots. */
+    public PagedCallSettings.Builder<
+            ListTopicSnapshotsRequest, ListTopicSnapshotsResponse, ListTopicSnapshotsPagedResponse>
+        listTopicSnapshotsSettings() {
+      return listTopicSnapshotsSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to deleteTopic. */
+    public UnaryCallSettings.Builder<DeleteTopicRequest, Empty> deleteTopicSettings() {
+      return deleteTopicSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to detachSubscription. */
+    public UnaryCallSettings.Builder<DetachSubscriptionRequest, DetachSubscriptionResponse>
+        detachSubscriptionSettings() {
+      return detachSubscriptionSettings;
+    }
+
+    @Override
+    public PublisherStubSettings build() throws IOException {
+      return new PublisherStubSettings(this);
+    }
+  }
+}
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/SessionName.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/SessionName.golden
new file mode 100644
index 0000000000..4dbe76e88e
--- /dev/null
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/SessionName.golden
@@ -0,0 +1,127 @@
+package com.google.showcase.v1beta1;
+
+import com.google.api.pathtemplate.PathTemplate;
+import com.google.api.resourcenames.ResourceName;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.ImmutableMap;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+@Generated("by gapic-generator-java")
+public class SessionName implements ResourceName {
+  private static final PathTemplate SESSION =
+      PathTemplate.createWithoutUrlEncoding("sessions/{session}");
+  private volatile Map<String, String> fieldValuesMap;
+  private final String session;
+
+  private SessionName(Builder builder) {
+    session = Preconditions.checkNotNull(builder.getSession());
+  }
+
+  public String getSession() {
+    return session;
+  }
+
+  public static Builder newBuilder() {
+    return new Builder();
+  }
+
+  public Builder toBuilder() {
+    return new Builder(this);
+  }
+
+  public static SessionName of(String session) {
+    return newBuilder().setSession(session).build();
+  }
+
+  public static String format(String session) {
+    return newBuilder().setSession(session).build().toString();
+  }
+
+  public static SessionName parse(String formattedString) {
+    if (formattedString.isEmpty()) {
+      return null;
+    }
+    Map<String, String> matchMap =
+        SESSION.validatedMatch(
+            formattedString, "SessionName.parse: formattedString not in valid format");
+    return of(matchMap.get("session"));
+  }
+
+  public static List<SessionName> parseList(List<String> formattedStrings) {
+    List<SessionName> list = new ArrayList<>(formattedStrings.size());
+    for (String formattedString : formattedStrings) {
+      list.add(parse(formattedString));
+    }
+    return list;
+  }
+
+  public static List<String> toStringList(List<SessionName> values) {
+    List<String> list = new ArrayList<>(values.size());
+    for (SessionName value : values) {
+      if (Objects.isNull(value)) {
+        list.add("");
+      } else {
+        list.add(value.toString());
+      }
+    }
+    return list;
+  }
+
+  public static boolean isParsableFrom(String formattedString) {
+    return SESSION.matches(formattedString);
+  }
+
+  @Override
+  public Map<String, String> getFieldValuesMap() {
+    if (Objects.isNull(fieldValuesMap)) {
+      synchronized (this) {
+        if (Objects.isNull(fieldValuesMap)) {
+          ImmutableMap.Builder<String, String> fieldMapBuilder = ImmutableMap.builder();
+          if (!Objects.isNull(session)) {
+            fieldMapBuilder.put("session", session);
+          }
+          fieldValuesMap = fieldMapBuilder.build();
+        }
+      }
+    }
+    return fieldValuesMap;
+  }
+
+  public String getFieldValue(String fieldName) {
+    return getFieldValuesMap().get(fieldName);
+  }
+
+  @Override
+  public String toString() {
+    return SESSION.instantiate("session", session);
+  }
+
+  /** Builder for sessions/{session}. */
+  public static class Builder {
+    private String session;
+
+    private Builder() {}
+
+    public String getSession() {
+      return session;
+    }
+
+    public Builder setSession(String session) {
+      this.session = session;
+      return this;
+    }
+
+    private Builder(SessionName sessionName) {
+      session = sessionName.session;
+    }
+
+    public SessionName build() {
+      return new SessionName(this);
+    }
+  }
+}