kirktrue commented on code in PR #15723:
URL: https://github.com/apache/kafka/pull/15723#discussion_r1579862658


##########
clients/src/test/java/org/apache/kafka/clients/consumer/internals/RequestStateTest.java:
##########
@@ -48,4 +50,40 @@ public void testRequestStateSimple() {
         state.reset();
         assertTrue(state.canSendRequest(200));
     }
+
+    @Test
+    public void testTrackInflightOnSuccessfulAttempt() {
+        testTrackInflight(RequestState::onSuccessfulAttempt);
+    }
+
+    @Test
+    public void testTrackInflightOnFailedAttempt() {
+        testTrackInflight(RequestState::onFailedAttempt);
+    }
+
+    private void testTrackInflight(BiConsumer<RequestState, Integer> 
onCompletedAttempt) {
+        RequestState state = new RequestState(
+                new LogContext(),
+                this.getClass().getSimpleName(),
+                100,
+                2,
+                1000,
+                0);
+
+        // This is just being paranoid...
+        assertFalse(state.requestInFlight());
+
+        // When we've sent a request, the flag should update from false to 
true.
+        state.onSendAttempt();
+        assertTrue(state.requestInFlight());
+
+        // Now we've received the response.
+        onCompletedAttempt.accept(state, 236);
+
+        // When we've sent a second request with THE SAME TIMESTAMP as the 
previous response,

Review Comment:
   I added back the timestamp so we could use it in the `lastSentMs` value for 
debugging. So the comment should make sense again.



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