Github user aljoscha closed the pull request at:
https://github.com/apache/flink/pull/2547
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GitHub user aljoscha opened a pull request:
https://github.com/apache/flink/pull/2547
[FLINK-4552] Refactor WindowOperator/Trigger Tests
Before `WindowOperatorTest` was more like an integration test. We would
throw elements at `WindowOperator` and observe whether we got the correct
