Github user MartinPayne commented on the issue:
https://github.com/apache/nifi/pull/2780
@MikeThomsen I'm not too sure what you mean. At the moment you'll get a
NoClassDefFoundError unless JUnit 4 happens to be on the test classpath (it
won't be on the test classpath if you're using JUnit 5). That's because
nifi-mock declares JUnit 4 with a "provided" scope, when there is nothing
providing JUnit 4. It should be "compile" scope, because nifi-mock is making
use of JUnit assertions in non-test code.
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