JustineDevs TDD
Use this skill inside Codex when implementation should start by locking behavior with tests. tdd is a non-gating helper skill that supports execution once the relevant lane is ready.
Output
Produce:
- behavior to lock
- minimal regression or failing test shape
- implementation boundary
- proof that the test belongs to the requested change
- exact next trigger, usually the implementation lane or
$cleanup
Rules
- Prefer the smallest failing test that proves the requested behavior.
- Lock current behavior before cleanup or refactor work when behavior is not already protected.
- Do not treat
tddas a replacement for the build gate. - Keep test intent explicit so the next implementation step stays narrow.