Github user pwendell commented on the pull request:

    https://github.com/apache/spark/pull/3372#issuecomment-63737621
  
    Personally, I think this is fine to add. IMO it's slightly over engineered 
given how much additional safety it provides. For instance, someone could add a 
new piece of state and still forget to clean it up. For this test to catch it, 
they'd have to explicitly add their state to these test fixtures. However, 
maybe having the code in-line there makes it more obvious that they should do 
it.
    
    So happy to have this.


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