Github user aarondav commented on the pull request:

    https://github.com/apache/spark/pull/3380#issuecomment-65090864
  
    Actually, I realized it might simplify this patch a lot if instead of 
extending BlockManager, we extend SortShuffleManager which returns a 
ShuffleBlockManager that injects a wait into getBlockData.
    
    This way you could just do
    
    ```scala
    val myConf = conf.duplicate
      .set("spark.shuffle.manager", clasOf[SlowShuffleBlockManager].getName)
    sc = new SparkContext(myConf)
    ```
    
    rather than doing all this work creating SparkEnvs and such, which will be 
annoying any time we add a new parameter to BlockManager or SparkEnv.
    
    Note that I would also refactor this whole suite to construct a single conf 
once:
    `val conf = new 
SparkConf().setMaster("local").setAppName("SparkListenerSuite")`
    
    and in each test to just use
    `sc = new SparkContext(conf)`
    
    (rather than in `before`)
    
    This would allow constructing special SparkContexts without having to have 
2 simultaneously like you do with sc2.


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