| name | tdd |
| description | Guide Test-Driven Development using Kent Beck's Red-Green-Refactor cycle. Use when writing tests, implementing features via TDD, or following plan.md test instructions. |
INSTRUCTIONS
Follow Kent Beck's TDD and Tidy First principles using the three-phase workflow:
- RED -
/tdd:red - Write ONE small failing test
- GREEN -
/tdd:green - Make it pass with minimal code, then commit
- REFACTOR -
/tdd:refactor - Improve structure without changing behavior, commit each step
Workflow Pattern
/tdd:red → write failing test → /tdd:green → pass test → /git:commit
↓
← next feature ← /tdd:red ← satisfied? ← /tdd:refactor (repeat as needed)
Core Principles
- One test at a time: Each RED adds exactly ONE failing test
- Minimal code: GREEN phase writes just enough to pass
- Never skip REFACTOR: Every TDD cycle must complete all three phases
- Tidy First: Separate structural changes (refactor) from behavioral changes (feat/fix)
- Small commits: Commit after GREEN, commit after EACH refactor step
Strategy Selection (GREEN Phase)
| Confidence | Strategy | Use When |
|---|
| Low | Fake It | Return constant, generalize later |
| High | Obvious Implementation | Solution is clear |
| Generalizing | Triangulation | Add test to break a fake |
Quality Standards
- Eliminate duplication between test and production code
- Express intent through clear naming
- Keep methods small and focused
- Run ALL tests after EVERY change
