Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/427#issuecomment-75271706
I think we should rework the test case to check that the configuration is
properly passed to the system. Right now the exception is thrown in
```ds.writeAsText(null)``` because we pass ```null```.
I'd propose something like @StephanEwen did in the PR #410. We set the
number of slots in the configuration and the job to ```PARALLELISM_AUTO_MAX```.
With the special input format which produces only a single element per split,
we can count the number of parallel tasks, given that every task receives only
one input split.
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