kirktrue commented on code in PR #13664:
URL: https://github.com/apache/kafka/pull/13664#discussion_r1183863358


##########
clients/src/test/java/org/apache/kafka/clients/consumer/internals/DefaultBackgroundThreadTest.java:
##########
@@ -89,11 +90,14 @@ public void setup() {
     }
 
     @Test
-    public void testStartupAndTearDown() {
+    public void testStartupAndTearDown() throws InterruptedException {
+        
when(coordinatorManager.poll(anyLong())).thenReturn(mockPollCoordinatorResult());
+        when(commitManager.poll(anyLong())).thenReturn(mockPollCommitResult());
         DefaultBackgroundThread backgroundThread = mockBackgroundThread();
         backgroundThread.start();
-        assertTrue(backgroundThread.isRunning());
+        TestUtils.waitForCondition(backgroundThread::isRunning, "Failed 
awaiting for the background thread to be running");
         backgroundThread.close();
+        assertFalse(backgroundThread.isRunning());

Review Comment:
   Is it possible that `isRunning()` could take some time to return `false` or 
is it guaranteed to be set by the time `close()` is finished?



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