dajac commented on code in PR #15721:
URL: https://github.com/apache/kafka/pull/15721#discussion_r1577407602


##########
group-coordinator/src/test/java/org/apache/kafka/coordinator/group/Assertions.java:
##########
@@ -198,6 +207,43 @@ private static void assertApiMessageAndVersionEquals(
                     }
                 }
             }
+        } else if (actual.message() instanceof GroupMetadataValue) {
+            GroupMetadataValue expectedValue = (GroupMetadataValue) 
expected.message().duplicate();
+            GroupMetadataValue actualValue = (GroupMetadataValue) 
actual.message().duplicate();
+
+            
expectedValue.members().sort(Comparator.comparing(GroupMetadataValue.MemberMetadata::memberId));
+            
actualValue.members().sort(Comparator.comparing(GroupMetadataValue.MemberMetadata::memberId));
+            try {
+                Arrays.asList(expectedValue, actualValue).forEach(value ->
+                    value.members().forEach(memberMetadata -> {
+                        // Sort topics and ownedPartitions in Subscription.
+                        ConsumerPartitionAssignor.Subscription subscription =
+                            
ConsumerProtocol.deserializeSubscription(ByteBuffer.wrap(memberMetadata.subscription()));
+                        subscription.topics().sort(String::compareTo);
+                        subscription.ownedPartitions().sort(
+                            
Comparator.comparing(TopicPartition::topic).thenComparing(TopicPartition::partition)
+                        );
+                        
memberMetadata.setSubscription(Utils.toArray(ConsumerProtocol.serializeSubscription(
+                            subscription,
+                            
ConsumerProtocol.deserializeVersion(ByteBuffer.wrap(memberMetadata.subscription()))
+                        )));
+
+                        // Sort partitions in Assignment.
+                        ConsumerPartitionAssignor.Assignment assignment =
+                            
ConsumerProtocol.deserializeAssignment(ByteBuffer.wrap(memberMetadata.assignment()));
+                        assignment.partitions().sort(
+                            
Comparator.comparing(TopicPartition::topic).thenComparing(TopicPartition::partition)
+                        );
+                        
memberMetadata.setAssignment(Utils.toArray(ConsumerProtocol.serializeAssignment(
+                            assignment,
+                            
ConsumerProtocol.deserializeVersion(ByteBuffer.wrap(memberMetadata.assignment()))
+                        )));
+                    })
+                );
+            } catch (SchemaException ex) {
+                System.out.println("Failed deserialization: " + 
ex.getMessage());

Review Comment:
   nit: Sorry, I missed this one. We usually don't keep `println` in tests. It 
may be better to call `fail` with an appropriate message.



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