Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/335#issuecomment-71492121
Sure, XyzTest are unit tests which are executed in Maven's test phase.
These should execute rather fast. Everything that brings up a full Flink system
is an integration test case (XyzITCase) and executed during mvn verify. These
are used for long running tests.
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