Tests from Spec: Cases from the Requirements — Writes test cases for a function from its specification rather than from its code, as a JSON table that any test runner can loop over. Every rule, boundary and error the spec defines gets a case, and every expected value is worked out from the spec; where the code you show disagrees with the spec, the case follows the spec and a note says where. Behaviour the spec leaves open becomes a question instead of a guessed case. Use to write unit tests fro…

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