Github user NicoK commented on the issue:
https://github.com/apache/flink/pull/4414
Yes, both your observations are correct. The pattern in most tests inside
`KafkaConsumerTestBase` is to
1) start a job,
2) do some processing, e.g. until some offset or another finish condition,
including some checks
3) cancel the job
4) check for exceptions
Since cancelling the job issues a `JobCancellationException`, this must be
ignored.
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