Github user peter-gergely-horvath commented on the issue:
https://github.com/apache/nifi/pull/2872
Hi @MikeThomsen sorry for the delay, I have been just very busy. It turns
out there have been some changes in the flow XML format, which I have fixed
against the latest GA version: now all of the tests are executed properly.
I have also introduced strict version checking: the NiFi version referenced
in the flow file is checked against the actual version of the NiFi distribution
used so that we can avoid confusion in the future.
If a user tries to run the test harness with a flow created using a
different version of NiFi than the one actually used, this will fail fast,
preventing a non functioning installation leaving the user being confused why
it does not work properly.
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