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skills/.changeset/tdd-tautological-tests.md
Matt Pocock 43ea0884b0 tdd: add tautological-test anti-pattern 
Tests whose assertion is recomputed the way the code computes it pass by
construction and give zero confidence. Add it as a peer of the existing
implementation-coupling anti-pattern: a Philosophy principle, a per-cycle
checklist gate, and a BAD/GOOD example pair in tests.md. Includes a patch
changeset.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-06-29 21:22:50 +01:00

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mattpocock-skills
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Add the tautological test anti-pattern to the tdd skill. Tests whose assertion is recomputed the way the code computes it pass by construction and give zero confidence — distinct from the implementation-coupling anti-pattern already covered. Added as a peer at the same three sites: a Philosophy principle (expected values must come from an independent source of truth), a per-cycle checklist gate, and a BAD/GOOD example pair in tests.md.