narendly commented on a change in pull request #624: Stabilize 5 unstable tests
URL: https://github.com/apache/helix/pull/624#discussion_r350500034
 
 

 ##########
 File path: helix-core/src/test/java/org/apache/helix/integration/TestDrop.java
 ##########
 @@ -55,16 +55,26 @@
    * @param participants
    */
   private void assertEmptyCSandEV(String clusterName, String db,
-      MockParticipantManager[] participants) {
+      MockParticipantManager[] participants) throws Exception {
     HelixDataAccessor accessor =
         new ZKHelixDataAccessor(clusterName, new 
ZkBaseDataAccessor<>(_gZkClient));
     PropertyKey.Builder keyBuilder = accessor.keyBuilder();
-    Assert.assertNull(accessor.getProperty(keyBuilder.externalView(db)));
+    boolean isExternalViewNull = TestHelper.verify(() -> {
+      ExternalView externalView = 
accessor.getProperty(keyBuilder.externalView(db));
+      return (externalView == null);
+    }, TestHelper.WAIT_DURATION);
+    Assert.assertTrue(isExternalViewNull);
 
     for (MockParticipantManager participant : participants) {
       String instanceName = participant.getInstanceName();
       String sessionId = participant.getSessionId();
-      
Assert.assertNull(accessor.getProperty(keyBuilder.currentState(instanceName, 
sessionId, db)));
+      boolean isCurrentStateNull = TestHelper.verify(() -> {
+        CurrentState currentState = 
accessor.getProperty(keyBuilder.currentState(instanceName, sessionId, db));
+        return (currentState == null);
+      }, TestHelper.WAIT_DURATION);
+      Assert.assertTrue(isCurrentStateNull);
+
+
 
 Review comment:
   Redundant space?

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