Github user ggevay commented on the pull request:
https://github.com/apache/flink/pull/919#issuecomment-122266924
Fabian pointed my attention to this Jira:
https://issues.apache.org/jira/browse/FLINK-2198
where some discussion about this problem has already taken place. Now, I
also did some investigation on how to make a directory not writable in Windows,
and it really seems to be impossible. So this workaround that we just skip
these test on Windows might be acceptable.
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