Github user haohui commented on the issue:
https://github.com/apache/flink/pull/3655
Looks good to me overall. Instead of changing in the normal code path,
maybe it is a little bit less intrusive to use Mockito to change the field? For
example:
```
JobArchiveFetcherTask task = Whitebox.getInternal(archiveFetcher,
"fetcherTask");
JobArchiveFetcherTask spiedTask = Mockito.spy(task);
Whitebox.setInternal(archiveFetcher, "fetcherTask", spiedTask);
doAnswer(answer ->
latch.countDown()).doCallRealMethod().when(spiedTask).run();
```
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