Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/952#issuecomment-127077814
For the test it is important that it catches the case where someone adds a
method (for example "setStringArray()") to the base class and does not override
it in the superclass.
We could also catch that easier, if we make the "setInternal()" method
package private and override it in the UnmodifiableConfiguration to throw an
exception.
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