mjsax commented on code in PR #14164:
URL: https://github.com/apache/kafka/pull/14164#discussion_r1287681335


##########
streams/src/test/java/org/apache/kafka/streams/processor/internals/StreamsPartitionAssignorTest.java:
##########
@@ -272,27 +300,50 @@ private void createMockTaskManager(final Set<TaskId> 
activeTasks,
     // If mockCreateInternalTopics is true the internal topic manager will 
report that it had to create all internal
     // topics and we will skip the listOffsets request for these changelogs
     private MockInternalTopicManager 
overwriteInternalTopicManagerWithMock(final boolean mockCreateInternalTopics) {
-        final MockInternalTopicManager mockInternalTopicManager = new 
MockInternalTopicManager(
+        return overwriteInternalTopicManagerWithMock(mockCreateInternalTopics, 
null);
+    }
+
+    private MockInternalTopicManager 
overwriteInternalTopicManagerWithMock(final boolean mockCreateInternalTopics, 
final List<Map<String, List<TopicPartitionInfo>>> topicPartitionInfo) {
+        final MockInternalTopicManager mockInternalTopicManager = spy(new 
MockInternalTopicManager(
             time,
             new StreamsConfig(configProps()),
             mockClientSupplier.restoreConsumer,
             mockCreateInternalTopics
-        );
+        ));
+
+        if (topicPartitionInfo != null) {
+            
lenient().when(mockInternalTopicManager.getTopicPartitionInfo(anySet())).thenAnswer(
+                i -> {
+                    final Set<String> topics = i.getArgument(0);
+                    for (final Map<String, List<TopicPartitionInfo>> tp : 
topicPartitionInfo) {
+                        if (topics.equals(tp.keySet())) {
+                            return tp;
+                        }
+                    }
+                    return null;

Review Comment:
   Is `null` right here? Or should it be an empty `Map` ?



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