cadonna commented on code in PR #15440: URL: https://github.com/apache/kafka/pull/15440#discussion_r1507610459
########## clients/src/test/java/org/apache/kafka/clients/consumer/internals/MembershipManagerImplTest.java: ########## @@ -764,6 +766,44 @@ public void testLeaveGroupWhenMemberOwnsAssignment() { testLeaveGroupReleasesAssignmentAndResetsEpochToSendLeaveGroup(membershipManager); } + @Test + public void testLeaveGroupWhenAssignmentEmpty() { + String topicName = "topic1"; + TopicPartition ownedPartition = new TopicPartition(topicName, 0); + MembershipManager membershipManager = createMemberInStableState(); + + // We own a partition and rebalance listener is registered + when(subscriptionState.assignedPartitions()).thenReturn(Collections.singleton(ownedPartition)); + when(subscriptionState.hasAutoAssignedPartitions()).thenReturn(true); + when(subscriptionState.rebalanceListener()).thenReturn(Optional.of(mock(ConsumerRebalanceListener.class))); + doNothing().when(subscriptionState).markPendingRevocation(anySet()); + + // Trigger leave group + CompletableFuture<Void> leaveResult1 = membershipManager.leaveGroup(); + + // Rebalance listener not yet triggered + final ArgumentCaptor<ConsumerRebalanceListenerCallbackNeededEvent> consumerRebalanceListener = + ArgumentCaptor.forClass(ConsumerRebalanceListenerCallbackNeededEvent.class); + verify(backgroundEventHandler).add(consumerRebalanceListener.capture()); + final ConsumerRebalanceListenerCallbackNeededEvent callbackEvent = consumerRebalanceListener.getValue(); + assertFalse(leaveResult1.isDone()); + assertEquals(MemberState.PREPARE_LEAVING, membershipManager.state()); + + // Clear the assignment + when(subscriptionState.assignedPartitions()).thenReturn(Collections.emptySet()); + when(subscriptionState.hasAutoAssignedPartitions()).thenReturn(false); + + // Complete the callback + callbackEvent.future().complete(null); + + // Completed the listener Review Comment: This comment does not make too much sense since the leave future is still verified to be not completed. ########## clients/src/test/java/org/apache/kafka/clients/consumer/internals/MembershipManagerImplTest.java: ########## @@ -764,6 +766,44 @@ public void testLeaveGroupWhenMemberOwnsAssignment() { testLeaveGroupReleasesAssignmentAndResetsEpochToSendLeaveGroup(membershipManager); } + @Test + public void testLeaveGroupWhenAssignmentEmpty() { Review Comment: Is there maybe a more direct way to test the bug? I had a hard time to understand this unit test. Nevermind if there is no more direct way. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: jira-unsubscr...@kafka.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org