coltmcnealy-lh commented on code in PR #17527:
URL: https://github.com/apache/kafka/pull/17527#discussion_r1805583386


##########
clients/src/test/java/org/apache/kafka/clients/MockClient.java:
##########
@@ -336,6 +336,12 @@ public List<ClientResponse> poll(long timeoutMs, long now) 
{
             copy.add(response);
         }
 
+        if (copy.isEmpty()) {
+            // Simulate time advancing. If no responses are received, then we 
know that
+            // we waited for the whole timeoutMs.
+            time.sleep(timeoutMs);

Review Comment:
   I noticed when developing my test that repeated calls to `poll()` with 
`timeoutMs == 10` never resulted in `time.milliseconds()` advancing, so the 
fictitious `Node` in my test never became ready (time never advanced past the 
throttled time). That's why I made this change; however, it broke all sorts of 
things.



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