Rob Sewell shows off the Because parameter in Pester 4.2.0:
This release adds the Because parameter to the all assertions. This means that you can add a reason why the test has failed. As JAKUB JAREŠ writes here
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Reasons force you think more 
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Reasons document your intent 
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Reasons make your TestCases clearer 
Click through for examples galore. 4.2.1 should have a -Parent macro which inputs -Because “I said so”.