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name: tdd-workflow description: Test-Driven Development workflow principles. RED-GREEN-REFACTOR cycle. allowed-tools: Read, Write, Edit, Glob, Grep, Bash

TDD Workflow

Write tests first, code second.

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1. The TDD Cycle

Copy🔴 RED → Write failing test
    ↓
🟢 GREEN → Write minimal code to pass
    ↓
🔵 REFACTOR → Improve code quality
    ↓
   Repeat...

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2. The Three Laws of TDD

1. Write production code only to make a failing test pass
2. Write only enough test to demonstrate failure
3. Write only enough code to make the test pass

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3. RED Phase Principles

What to Write

RED Phase Rules

• Test must fail first
• Test name describes expected behavior
• One assertion per test (ideally)

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4. GREEN Phase Principles

Minimum Code

GREEN Phase Rules

• Don't write unneeded code
• Don't optimize yet
• Pass the test, nothing more

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5. REFACTOR Phase Principles

What to Improve

REFACTOR Rules

• All tests must stay green
• Small incremental changes
• Commit after each refactor

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6. AAA Pattern

Every test follows:

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7. When to Use TDD

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8. Test Prioritization

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9. Anti-Patterns

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10. AI-Augmented TDD

Multi-Agent Pattern

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Remember: The test is the specification. If you can't write a test, you don't understand the requirement.