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tdd: add tautological-test anti-pattern

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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>
This commit is contained in:
Matt Pocock 2026-06-29 21:22:50 +01:00
parent a116824938
commit 43ea0884b0
3 changed files with 24 additions and 0 deletions
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.changeset/tdd-tautological-tests.md Normal file
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"mattpocock-skills": patch
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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`.