NIFI-14041 - Improve MockPropertyValue and EL evaluation validation

[pvillard31]

Summary

NIFI-14041 - Improve MockPropertyValue and EL evaluation validation

While building a processor, I noticed that the test framework would throw an error if I'm in the below situation:

• Processor with input forbidden
• Property with EL support with Environment scope
• Evaluation of the EL with .evaluateAttributeExpressions(Map<String,String>)

This should not throw an error. This PR is to fix this case as well as covering the overall EL evaluation in the test framework with proper unit testing.

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  • JDK 21

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[exceptionfactory]

Thanks for improving this behavior @pvillard31. The changes look good, just noted some syntax improvement recommendations in the test class.

[pvillard31]

Thanks for reviewing @exceptionfactory - pushed a commit to address your comments

[exceptionfactory]

Thanks for making the adjustments @pvillard31! +1 merging