tdd
TDD Skill
Strict red-green-refactor for all net-new behavior. Test-first, one behavior slice at a time.
Constraints
- Test-first — no production code without a failing test that demands it.
- Minimal diff — no unrelated refactors, renames, or formatting churn.
- Deterministic — control time, randomness, I/O, and concurrency via seams/fakes.
- Fail fast — no silent error swallowing without a test proving the intent.
Cycle
Per behavior slice, execute the canonical red-green-refactor loop:
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