lianetm commented on code in PR #16312:
URL: https://github.com/apache/kafka/pull/16312#discussion_r1644942652


##########
clients/src/test/java/org/apache/kafka/clients/consumer/internals/MembershipManagerImplTest.java:
##########
@@ -366,12 +384,12 @@ public void testFencingWhenStateIsPrepareLeaving() {
         completeCallback(callbackEvent, membershipManager);
         assertEquals(MemberState.UNSUBSCRIBED, membershipManager.state());
         assertEquals(ConsumerGroupHeartbeatRequest.LEAVE_GROUP_MEMBER_EPOCH, 
membershipManager.memberEpoch());
-        verify(membershipManager).notifyEpochChange(Optional.empty(), 
Optional.empty());

Review Comment:
   Even though I totally agree with removing all the spies there were on other 
components, I would lean towards spying only on this membershipManager 
component in cases like this, where it seems valuable to verify on it. It would 
only mean that we spy on it when needed with `membershipManager = 
spy(createMemberInStableState())` on the specific tests that do verify, and not 
spying on membershipmanager for all test that in the end don;t need it. Makes 
sense?



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