lucasbru commented on code in PR #19818:
URL: https://github.com/apache/kafka/pull/19818#discussion_r2111669088


##########
clients/src/test/java/org/apache/kafka/clients/consumer/internals/ConsumerMembershipManagerTest.java:
##########
@@ -998,16 +1005,43 @@ public void 
testIgnoreHeartbeatResponseWhenNotInGroup(MemberState state) {
 
         assertEquals(state, membershipManager.state());
         verify(responseData, never()).memberId();
-        verify(responseData, never()).memberEpoch();
+        // In unsubscribed, we check if we received a leave group response, so 
we do verify member epoch.
+        if (state != MemberState.UNSUBSCRIBED) {
+            verify(responseData, never()).memberEpoch();
+        }
         verify(responseData, never()).assignment();
     }
 
     @Test
-    public void testLeaveGroupWhenStateIsReconciling() {
-        ConsumerMembershipManager membershipManager = 
mockJoinAndReceiveAssignment(false);
-        assertEquals(MemberState.RECONCILING, membershipManager.state());
+    public void testIgnoreLeaveResponseWhenNotLeavingGroup() {
+        ConsumerMembershipManager membershipManager = 
createMemberInStableState();
 
-        
testLeaveGroupReleasesAssignmentAndResetsEpochToSendLeaveGroup(membershipManager);
+        CompletableFuture<Void> leaveResult = membershipManager.leaveGroup();
+
+        // Send leave request, transitioning to UNSUBSCRIBED state
+        membershipManager.onHeartbeatRequestGenerated();
+        assertEquals(MemberState.UNSUBSCRIBED, membershipManager.state());
+
+        // Receive a previous heartbeat response, which should be ignored
+        membershipManager.onHeartbeatSuccess(new 
ConsumerGroupHeartbeatResponse(
+            new ConsumerGroupHeartbeatResponseData()
+                .setErrorCode(Errors.NONE.code())
+                .setMemberId(membershipManager.memberId())
+                .setMemberEpoch(MEMBER_EPOCH)
+        ));
+        assertFalse(leaveResult.isDone());

Review Comment:
   In this line, I am leaving the group. The IgnoreLeaveResponse referes to the 
fact that I ignore the heartbeat after leaving the group is further down (the 
second 
`membershipManager.onHeartbeatSuccess(createConsumerGroupLeaveResponse(membershipManager.memberId()));`).



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