Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/2183
If our components are not testable, then this is good indicator that we can
still improve our design. But actually I think that it should be doable in this
case. Can't we mock the `Session` such that it stores all `ResultSetFutures`.
We can then manually let one of the futures fail and let the other complete
normally. That way, we could test the newly implemented behaviour.
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