chore: add temp code replacement hack due to gapic code-gen template bug

synth.py

@@ -17,6 +17,7 @@
 import synthtool as s
 import synthtool.gcp as gcp
 import synthtool.languages.java as java
+import os
 
 AUTOSYNTH_MULTIPLE_COMMITS = True
 
@@ -35,3 +36,26 @@
   )
 
 java.common_templates()
+
+# TODO: Remove all below s.replace() logic when upstream correction is made in gapic https://github.com/googleapis/gapic-generator/issues/3181
+# Remove line added by gapic generator
+s.replace("google-cloud-bigquerystorage/src/test/java/com/google/cloud/bigquery/storage/v1alpha2/MockBigQueryWriteImpl.java",
+          "final Object response = responses.remove();",
+          "")
+
+# Add back lines removed by gapic generator
+s.replace("google-cloud-bigquerystorage/src/test/java/com/google/cloud/bigquery/storage/v1alpha2/MockBigQueryWriteImpl.java",
+          """
+          public void onNext(AppendRowsRequest value) {
+            if (response instanceof AppendRowsResponse) {
+          """,
+          """
+          public void onNext(AppendRowsRequest value) {
+            requests.add(value);
+            final Object response = responses.remove();
+            if (response instanceof AppendRowsResponse) {
+          """
+          )
+
+# Re-run java code formatter after making hacky code change
+os.system("mvn com.coveo:fmt-maven-plugin:format")