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150 lines
2.7 KiB
Markdown
150 lines
2.7 KiB
Markdown
---
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name: tdd-workflow
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description: Test-Driven Development workflow principles. RED-GREEN-REFACTOR cycle.
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allowed-tools: Read, Write, Edit, Glob, Grep, Bash
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---
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# TDD Workflow
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> Write tests first, code second.
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---
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## 1. The TDD Cycle
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```
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🔴 RED → Write failing test
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↓
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🟢 GREEN → Write minimal code to pass
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↓
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🔵 REFACTOR → Improve code quality
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↓
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Repeat...
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```
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---
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## 2. The Three Laws of TDD
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1. Write production code only to make a failing test pass
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2. Write only enough test to demonstrate failure
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3. Write only enough code to make the test pass
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---
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## 3. RED Phase Principles
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### What to Write
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| Focus | Example |
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|-------|---------|
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| Behavior | "should add two numbers" |
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| Edge cases | "should handle empty input" |
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| Error states | "should throw for invalid data" |
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### RED Phase Rules
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- Test must fail first
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- Test name describes expected behavior
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- One assertion per test (ideally)
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---
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## 4. GREEN Phase Principles
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### Minimum Code
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| Principle | Meaning |
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|-----------|---------|
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| **YAGNI** | You Aren't Gonna Need It |
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| **Simplest thing** | Write the minimum to pass |
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| **No optimization** | Just make it work |
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### GREEN Phase Rules
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- Don't write unneeded code
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- Don't optimize yet
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- Pass the test, nothing more
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---
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## 5. REFACTOR Phase Principles
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### What to Improve
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| Area | Action |
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|------|--------|
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| Duplication | Extract common code |
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| Naming | Make intent clear |
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| Structure | Improve organization |
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| Complexity | Simplify logic |
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### REFACTOR Rules
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- All tests must stay green
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- Small incremental changes
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- Commit after each refactor
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---
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## 6. AAA Pattern
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Every test follows:
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| Step | Purpose |
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|------|---------|
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| **Arrange** | Set up test data |
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| **Act** | Execute code under test |
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| **Assert** | Verify expected outcome |
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---
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## 7. When to Use TDD
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| Scenario | TDD Value |
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|----------|-----------|
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| New feature | High |
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| Bug fix | High (write test first) |
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| Complex logic | High |
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| Exploratory | Low (spike, then TDD) |
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| UI layout | Low |
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---
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## 8. Test Prioritization
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| Priority | Test Type |
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|----------|-----------|
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| 1 | Happy path |
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| 2 | Error cases |
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| 3 | Edge cases |
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| 4 | Performance |
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---
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## 9. Anti-Patterns
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| ❌ Don't | ✅ Do |
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|----------|-------|
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| Skip the RED phase | Watch test fail first |
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| Write tests after | Write tests before |
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| Over-engineer initial | Keep it simple |
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| Multiple asserts | One behavior per test |
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| Test implementation | Test behavior |
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---
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## 10. AI-Augmented TDD
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### Multi-Agent Pattern
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| Agent | Role |
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|-------|------|
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| Agent A | Write failing tests (RED) |
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| Agent B | Implement to pass (GREEN) |
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| Agent C | Optimize (REFACTOR) |
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---
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> **Remember:** The test is the specification. If you can't write a test, you don't understand the requirement.
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