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---
name: test-driven-development
description: "Use when implementing any feature or bugfix, before writing implementation code. Enforces red-green-refactor cycle with strict rules."
---
# Test-Driven Development (TDD)
## Rule
Write the test first. Watch it fail. Write minimal code to pass.
**Core principle:** If you didn't watch the test fail, you don't know if it tests the right thing.
## When to Use
Always for:
- New features
- Bug fixes
- Refactoring with behavior changes
Skip only for:
- Config file changes
- Documentation updates
- Non-functional changes (formatting, comments)
## Process
1. **Red**: Write a failing test
2. **Green**: Write minimal code to pass
3. **Refactor**: Clean up while keeping tests green
## Anti-Patterns
- Writing implementation before the test
- Skipping the "watch it fail" step
- Writing tests that are too coupled to implementation
- Testing framework behavior instead of your code
