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tests-adversarial

Use when hardening error handling, validating boundary behavior, or hunting silent failures. Not for feature development: use tdd. Not for test deletion: use tests-purge-unneeded.

.devin/skills/tests-adversarial/SKILL.md

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# Adversarial test authoring

## Contract

| Field | Bound contract |
|---|---|
| Trigger | The work is hardening error handling, validating boundary behavior, or hunting silent failures. |
| Authority | Reversible local: writes only test files, local artifacts, and minimal production code changes to fix silent failures discovered by the tests; rollback is reverting the commit or deleting added files. No remote mutation. |
| Side effect | Writes assumption-violation tests over inputs, ordering, timing, state, resources, and impossible cases; fixes silent failures in production code so every failure path signals; runs sanitized race-detector gates. |
| Done | Every documented assumption has a violation test, every failure path produces a descriptive error, and every selected sanitizer available on the toolchain passes with zero warnings; a sanitizer unavailable on the toolchain is recorded as a gap and never excuses a failure in one that ran. |

## Inputs

- Code under test (required): source files, modules, or functions to harden.