Github user FRosner commented on the pull request: https://github.com/apache/spark/pull/9222#issuecomment-151056747 @sun-rui I am not sure how callJStatic works but I can imagine that making a method private does not allow it to be called - neither from the test, nor from R. Why would you not want to have a unit test. Test driven development is a good invention and helps developers (especially in OSS) to trust the code and make changes much easier.
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