[jira] [Created] (FLINK-21517) Test harnesses are bypassing serialization stack for events

[Shang Yuanchun (Jira)]

Piotr Nowojski created FLINK-21517:
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             Summary: Test harnesses are bypassing serialization stack for events
                 Key: FLINK-21517
                 URL: https://issues.apache.org/jira/browse/FLINK-21517
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Network, Tests
    Affects Versions: 1.12.1, 1.13.0
            Reporter: Piotr Nowojski


Since FLINK-19297 (https://github.com/apache/flink/pull/13447/files#diff-e5c3ecec28e8d4c2f7f62bc8a4c9ed88c30141d44a570059849a3b2120e4d2b50) we accidentally removed a test coverage for event (de)serialization from a lot of the unit tests, that were/are using test harnesses. For example because of that I almost broke 1.12.2 release, since `stop-with-savepoint --drain` was never only tested using test harnesses (didn't have an ITCases and/or end to end test).



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