Github user squito commented on the pull request:
https://github.com/apache/spark/pull/6973#issuecomment-115370523
hmm, now I am a little confused -- that test actually passes even without
your changes. Sorry this may have been my fault for suggesting a test in
`SparkContextSuite` -- I guess `SparkContext` itself already handles multiple
calls to `stop()`.
I'm not convinced this is still needed, but I suppose it doesn't hurt. In
any case, I'd leave the test you have, and also add a case where you just stop
the env multiple times.
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