Development (TDD)

Core Rules (Non-Negotiable)

1. NEVER write production code without a failing test first
2. One behaviour per test
3. Write minimum code to make the test pass
4. Run tests and verify green state before proceeding

The TDD Cycle

🔴 RED    → Write ONE failing test
🟢 GREEN  → Write MINIMUM code to pass
✅ VERIFY → Run all tests, confirm green

Detailed Steps