TisonKun commented on issue #4844: [FLINK-7844] [ckPt] Fail unacknowledged pending checkpoints for fine grained recovery URL: https://github.com/apache/flink/pull/4844#issuecomment-535382660 > I would suggest to try and test this without as much mocking. Mockito-based tests have proven very hard to maintain. Mockito is still valuable to mock external systems and dependencies, but for internal APIs, I would refrain from using it as much as possible. Hi @StephanEwen. Recently I lost the context why we prefer prevent us from using Mockito for internal tests. I found this statement and want to ask again how it "have proven very hard to maintain". I don't find this part in our contributing guide and I think it would be a good part of it.
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