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    Good unit tests actually do test behaviour (in a GWT style) but you're right - they don't go across layers. Consider also that it perfectly possible to have unit tests without classes (in non-OO languages). Commented Mar 23, 2018 at 10:12
  • "There is a school of thought that a unit test tests some behaviour across layers but this isn't correct". This is a nonsense statement. You are not gifted with the absolute right to say whether another's opinion on a subjective matter is correct or not. You are free to disagree, but that doesn't make it incorrect. I like the FIRST acronym though. Swap out "Independent" and replace with "Isolated" and it's an excellent set of guidelines to good unit tests. Commented Mar 23, 2018 at 10:16
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    @DavidArno "Swap out "Independent" and replace with "Isolated"" I'd vote to keep both unfortunately breaking the cool acronym... Commented Mar 23, 2018 at 10:59
  • There is another cool acronym describing features of unit tests (sort of overlapping yours): Readable, Trustwothy, Fast and Maintainable. Commented Mar 23, 2018 at 11:02