Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/3587
Thanks for the thorough review, @tzulitai!
And shame over my head for all the code duplication ð±
I now refactored the contract tests into a base class and addressed all the
issues that you found (hopefully).
The failing `WindowOperatorTest` tests actually discovered a real problem,
I wasn't taking the allowed lateness into account when calculating if a merged
window would be late. I modified the new tests in in the contract test to
verify that we now have the correct behaviour.
Could you maybe have another look?
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