Github user pnowojski commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5239#discussion_r159863616
  
    --- Diff: 
flink-contrib/flink-storm/src/test/java/org/apache/flink/storm/wrappers/BoltWrapperTest.java
 ---
    @@ -375,11 +376,13 @@ public void declareOutputFields(OutputFieldsDeclarer 
declarer) {
                when(env.getMetricGroup()).thenReturn(new 
UnregisteredTaskMetricsGroup());
                when(env.getTaskManagerInfo()).thenReturn(new 
TestingTaskManagerRuntimeInfo());
     
    +           final CloseableRegistry closeableRegistry = new 
CloseableRegistry();
                StreamTask<?, ?> mockTask = mock(StreamTask.class);
                when(mockTask.getCheckpointLock()).thenReturn(new Object());
                when(mockTask.getConfiguration()).thenReturn(new 
StreamConfig(new Configuration()));
                when(mockTask.getEnvironment()).thenReturn(env);
                when(mockTask.getExecutionConfig()).thenReturn(execConfig);
    +           when(mockTask.getCancelables()).thenReturn(closeableRegistry);
    --- End diff --
    
    Mockito as always!
    
    Why not replace this ugly block with `NoOpStreamTask` or something else 
implementing `StreamTask`? It will save the hassle for next developer that will 
try to call some other method from this mock, that wasn't defined properly.


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