Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3235#issuecomment-62816944
This issue has bitten the Spark SQL folks, too. As you've noticed, this
shared SparkContext setup / teardown needs to be performed in a `before()`
method and not in the test suite constructor, since Maven may initialize
multiple test suites before running any of them, whereas sbt tends to
initialize them one at a time.
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