Individual skill
test-discipline
Design assertions that prove the actual contract and fail on realistic regressions
templates/skills/test-discipline/SKILL.md
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- Last checked
- Nov 3, 2026
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- Repository last updated
- Nov 6, 2026
- License
- MIT
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## Context
Use this skill whenever a change affects an API, public interface, workflow contract, generated
artifact, or user-observable behavior. A passing status-only test is not evidence that the
intended artifact or contract is correct.
## Patterns
- Update tests in the same change as an API, signature, export, or public-interface change.
- Make assertions name and inspect the offending artifact, output, or configuration field—not just
an exit code or broad success status.
- Mutation-test critical gates by changing the real source or emitted artifact and proving the
assertion turns red.
- Exercise every caller path for a changed parser, normalizer, or helper; isolated unit coverage