Github user peter-gergely-horvath commented on the issue:
https://github.com/apache/nifi/pull/2843
@joewitt The idea is that this component would allow you to write Java test
cases against your NiFi flow. Something like
[NiFiFlowTest](https://github.com/peter-gergely-horvath/nifi/blob/master/nifi-testharness/src/test/java/org/apache/nifi/testharness/samples/NiFiFlowTest.java#L101).
The JavaDoc on
[TestNiFiInstance](https://github.com/peter-gergely-horvath/nifi/blob/master/nifi-testharness/src/main/java/org/apache/nifi/testharness/TestNiFiInstance.java#L45)
should explain the concept quite well.
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