Github user pvillard31 commented on the issue:
https://github.com/apache/nifi/pull/2614
To provide more details here: after the release of 1.6.0 (with #2205), we
deprecated the use of ``expressionLanguageSupported(boolean)`` in favor of
``expressionLanguageSupported(ExpressionLanguageScope)``. Using the deprecated
method does not break anything in the code itself, the only difference is just
in the test framework where we are more strict checking if the appropriate
scope has been set on the property description. If not, the unit test will fail.
Most of the existing opened PRs introducing new properties that support
expression language without using the new scope might introduce unit test
failures. The only thing required is to update the property with the proper
scope.
Hope this clarifies things a bit.
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