Github user alopresto commented on the issue:
https://github.com/apache/nifi/pull/1374
I added a [unit
test](https://github.com/alopresto/nifi/commit/cf36bedb28021c73d4ea1be06a61057063366ca6#diff-9fffe09b7ce89a09c89a748fb7417b92)
which failed without this change and passes with it (just verifies that the
`onPropertyModified` method is invoked on the `ControllerService` by
`StandardProcessorTestRunner`).
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