Github user JoshRosen commented on the pull request:

    https://github.com/apache/spark/pull/3805#issuecomment-68156238
  
    This class of issue could be a more general problem for our test-suites, 
since I think there are a number of places where we call things like `new 
SparkConf()` that might implicitly read defaults from the configuration file.
    
    I wonder if there's a more general fix, such as using `Utils.isTesting` to 
bypass the defaults loading in unit tests.


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