Github user mxm commented on the pull request:
https://github.com/apache/flink/pull/605#issuecomment-138895326
Yes, there are tests in place of the new accumulators. The included
Accumulators all implement a deep copy in the clone() method. That's why they
didn't have to be ported. You don't need to include an extra test for the
runtime accumulators.
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