Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/2450
I've re-introduced the `ForkableFlinkMiniCluster`. However, this time it
only starts the normal distributed component classes (e.g. `JobManager` instead
of `TestingJobManager`, etc.). This implies that the testing messages are no
longer supported when using the `ForkableFlinkMiniCluster`.
I think the user should not meddle with the testing components in the first
place. Therefore, it seems to be fair to offer the user a mini cluster to run
his tests but not one which instantiates testing components. The recommended
cluster is the `LocalFlinkMiniCluster` from now on. However, in order to not
break all existing test code, we still maintain the `ForkableFlinkMiniCluster`.
Not having to start the testing classes allows to move them back into the
test scope of `flink-runtime`, since they are no longer required by the
`flink-test-utils` module.
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