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

    https://github.com/apache/spark/pull/7250#discussion_r34400496
  
    --- Diff: 
streaming/src/test/scala/org/apache/spark/streaming/StreamingContextSuite.scala 
---
    @@ -297,6 +299,23 @@ class StreamingContextSuite extends SparkFunSuite with 
BeforeAndAfter with Timeo
         Thread.sleep(100)
       }
     
    +  test("registering and de-registering of streamingSource") {
    +    val conf = new SparkConf().setMaster(master).setAppName(appName)
    +    ssc = new StreamingContext(conf, batchDuration)
    +    addInputStream(ssc).register()
    +
    +    ssc.start()
    +    assert(ssc.getState() === StreamingContextState.INITIALIZED)
    +    
assert(StreamingContextSuite.sources.get(StreamingContextSuite.streamingSource)!=
 "null")
    --- End diff --
    
    A much nicer way to do this is to do it they way it is done in 
https://github.com/apache/spark/blob/master/core/src/test/scala/org/apache/spark/ExecutorAllocationManagerSuite.scala#L782
    
    using the PrivateTester stuff. Please use that, we want to stay consistent 
to the rest of the code base.


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