Github user sunjincheng121 commented on the issue:
https://github.com/apache/flink/pull/3943
Hi @wuchong Thanks for your approval.
In addition to refactoring the test structure, I think that in addition to
ITCast other tests should be unified use of `batchTestUtil` and`
streamTestUtil`. What do you think? @wuchong @twalthr @fhueske
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