test-driven-development

# Test-Driven Development (TDD) ## Overview Write the test first. Watch it fail. Write minimal code to pass. **Core principle:** If you did not watch the test fail, you do not know if it tests the right thing. ## The Iron Law NO PRODUCTION CODE WITHOUT A FAILING TEST FIRST Write code before the test? Delete it. Start over. No exceptions. ## RED-GREEN-REFACTOR 1. **RED** - Write one failing test showing desired behavior 2. **Verify RED** - Run test, confirm it fails for the right reason 3. **GREEN** - Write simplest code to pass (YAGNI) 4. **Verify GREEN** - Run test + full suite, all must pass 5. **REFACTOR** - Clean up while keeping tests green 6. **COMMIT** - Frequent small commits ## Red Flags (STOP and Start Over) - Code before test - Test passes immediately - "I'll test after" - "Too simple to test" - Rationalizing "just this once" ## Agents Used - Process agents defined in `test-driven-development.js` ## Tool Use Invoke via babysitter process: `methodologies/superpowers/test-driven-development`