chia7712 commented on code in PR #16017:
URL: https://github.com/apache/kafka/pull/16017#discussion_r1618190171


##########
clients/src/test/java/org/apache/kafka/clients/consumer/internals/HeartbeatRequestManagerTest.java:
##########
@@ -880,4 +880,25 @@ private HeartbeatRequestManager 
createHeartbeatRequestManager(
                 backgroundEventHandler,
                 metrics);
     }
+
+
+    @Test
+    public void reproduceHeartbeatFail() throws InterruptedException {
+        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.transitionToSendingLeaveGroup(true);

Review Comment:
   +1 to `membershipManager.leaveGroup()`



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