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Pro-Tip: When writing TDD microtests, we want them to *read* "black box", but they will be *written* "white box".

(I prefer, btw, "opaque box" for the former, and "glass box" for the the latter, and will shift to that terminology now.)

Some folks will be troubled by this advice: reams of words by testers back the idea that tests should be written opaque-box.

Are those testers all wrong? Of course not. It's just that they're testers, not TDDers, and that context makes all the difference.