cadonna commented on a change in pull request #9273:
URL: https://github.com/apache/kafka/pull/9273#discussion_r501802252



##########
File path: streams/src/test/java/org/apache/kafka/streams/KafkaStreamsTest.java
##########
@@ -617,7 +619,19 @@ public void 
shouldThrowExceptionSettingUncaughtExceptionHandlerNotInCreateState(
         final KafkaStreams streams = new 
KafkaStreams(getBuilderWithSource().build(), props, supplier, time);
         streams.start();
         try {
-            streams.setUncaughtExceptionHandler(null);
+            
streams.setUncaughtExceptionHandler((Thread.UncaughtExceptionHandler) null);
+            fail("Should throw IllegalStateException");
+        } catch (final IllegalStateException e) {
+            // expected
+        }
+    }

Review comment:
       Sorry, my bad! It doesn't matter whether it is called or not, since the 
`IllegalStateException` is thrown.

##########
File path: streams/src/test/java/org/apache/kafka/streams/KafkaStreamsTest.java
##########
@@ -617,7 +619,19 @@ public void 
shouldThrowExceptionSettingUncaughtExceptionHandlerNotInCreateState(
         final KafkaStreams streams = new 
KafkaStreams(getBuilderWithSource().build(), props, supplier, time);
         streams.start();
         try {
-            streams.setUncaughtExceptionHandler(null);
+            
streams.setUncaughtExceptionHandler((Thread.UncaughtExceptionHandler) null);
+            fail("Should throw IllegalStateException");
+        } catch (final IllegalStateException e) {
+            // expected
+        }
+    }
+
+    @Test
+    public void 
shouldThrowExceptionSettingStreamsUncaughtExceptionHandlerNotInCreateState() {

Review comment:
       Actually, there are two tests missing. With the test you added, you test 
the `else` branch on line 400 in `KafkaStreams`.  But you do not test the 
`then` branch of the same `if` statement and within the `then` branch there are 
again a `then` branch and a `else` branch to test. 
   If you do without the inner `else` branch as I proposed in another comment, 
you need to test the exception that is thrown when `null` is passed to the 
method. 




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