tdd-workflowlisted

# TDD Workflow Skill ## Overview Test-Driven Development methodology for Node.js/TypeScript projects. ## The RED-GREEN-REFACTOR Cycle ### RED Phase: Design Failing Tests Write tests BEFORE implementation: 1. **Identify Behavior**: What should the code do? 2. **Design Test Cases**: Cover all scenarios 3. **Write Tests**: Use AAA pattern 4. **Run Tests**: Confirm they FAIL 5. **Verify Failure**: Tests fail for the RIGHT reason ### GREEN Phase: Minimal Implementation Make tests pass with minimal code: 1. **Focus**: One failing test at a time 2. **Implement**: Just enough to pass 3. **Verify**: Run tests, confirm GREEN 4. **Iterate**: Next failing test 5. **Complete**: All tests passing ### REFACTOR Phase: Improve Design Improve code while keeping tests green: 1. **Review**: Identify code smells 2. **Plan**: Choose refactoring 3. **Apply**: Make the change 4. **Verify**: Tests still GREEN 5. **Repeat**: Until quality gates met ## AAA Pattern ```typescript describe('Calculator', () => { it('should add two numbers correctly', () => { // Arrange - Set up test conditions const calculator = createCalculator(); // Act - Execute the behavior const result = calculator.add(2, 3); // Assert - Verify the outcome expect(result).toBe(5); }); }); ``` ## Test Naming Convention Format: `should {expectedBehavior} when {scenario}` Examples: ```typescript it('should return empty array when input is empty', ...); it('should throw ValidationError when ema