frankvicky commented on code in PR #16017:
URL: https://github.com/apache/kafka/pull/16017#discussion_r1619740146


##########
clients/src/test/java/org/apache/kafka/clients/consumer/internals/HeartbeatRequestManagerTest.java:
##########
@@ -752,6 +752,26 @@ public void 
testFencedMemberStopHeartbeatUntilItReleasesAssignmentToRejoin() {
         assertEquals(1, result.unsentRequests.size(), "Fenced member should 
resume heartbeat after transitioning to JOINING");
     }
 
+    @ParameterizedTest
+    @ApiKeyVersionsSource(apiKey = ApiKeys.CONSUMER_GROUP_HEARTBEAT)
+    public void testSendingLeaveGroupHeartbeatWhenPreviousOneInFlight(final 
short version) {
+        mockStableMember();
+        time.sleep(DEFAULT_HEARTBEAT_INTERVAL_MS);
+        NetworkClientDelegate.PollResult result = 
heartbeatRequestManager.poll(time.milliseconds());
+        assertEquals(1, result.unsentRequests.size());
+        result = heartbeatRequestManager.poll(time.milliseconds());
+        assertEquals(0, result.unsentRequests.size(), "No heartbeat should be 
sent while a previous one is in-flight");
+
+        membershipManager.leaveGroup();
+        assertTrue(membershipManager.isLeavingGroup());

Review Comment:
   This makes sense. In the unit test for 'HeartBratRequestManager,' we should 
focus solely on its functionality.
   I will remove this line. 



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