HADOOP-19197. Implement testUnmarshallOldEncryptionSecrets()

The old version of EncryptionSecrets is written to serialized-objects/EncryptionSecrets-HADOOP-19197.ser. The test will marshall the object from the old version.

Author: raphaelazzolini

hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/auth/TestMarshalledCredentials.java

@@ -19,7 +19,10 @@
 package org.apache.hadoop.fs.s3a.auth;
 
 import java.io.EOFException;
+import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.ObjectInputStream;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.util.Optional;
@@ -40,6 +43,7 @@
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.test.HadoopTestBase;
 
+import static org.apache.hadoop.fs.s3a.Constants.DEFAULT_S3_ENCRYPTION_CONTEXT;
 import static org.apache.hadoop.fs.s3a.S3AEncryptionMethods.SSE_S3;
 import static org.apache.hadoop.test.LambdaTestUtils.intercept;
 
@@ -165,9 +169,23 @@ public void testCredentialProviderNullURI() throws Throwable {
             MarshalledCredentials.CredentialTypeRequired.FullOnly));
   }
 
-  @org.junit.Test
+  @Test
   public void testUnmarshallOldEncryptionSecrets() throws Throwable {
-
+    try (InputStream is = getClass()
+        .getResourceAsStream("/serialized-objects/EncryptionSecrets-HADOOP-19197.ser");
+        ObjectInputStream ois = new ObjectInputStream(is)) {
+      EncryptionSecrets secrets = new EncryptionSecrets();
+      secrets.readFields(ois);
+      Assertions.assertThat(secrets.getEncryptionAlgorithm())
+          .describedAs("encryptionAlgorithm")
+          .isEqualTo(S3AEncryptionMethods.SSE_KMS.getMethod());
+      Assertions.assertThat(secrets .getEncryptionKey())
+          .describedAs("encryptionKey")
+          .isEqualTo(KEY);
+      Assertions.assertThat(secrets .getEncryptionContext())
+          .describedAs("encryptionContext")
+          .isEqualTo(DEFAULT_S3_ENCRYPTION_CONTEXT);
+    }
   }
 
   /**