Introduction

Test-Driven Development is not just a technical practice but a team practice. This article explores how to effectively implement TDD in a team environment.

Code Review Process


// Example of a good code review comment
/**
 * @review
 * - Tests cover all edge cases
 * - Code follows SOLID principles
 * - Performance considerations addressed
 * - Security measures implemented
 * - Documentation updated
 */

// Example of a test that should be added
describe('UserService', () => {
  test('should handle concurrent user creation', async () => {
    const requests = Array(10).fill().map(() =>
      userService.createUser({
        name: 'John',
        email: 'john@example.com'
      })
    );
    const results = await Promise.all(requests);
    expect(results.every(r => r.success)).toBe(true);
  });
});

Pair Programming


// Example of a pair programming session
// Driver writes the test
test('should calculate total with tax', () => {
  const calculator = new PriceCalculator();
  expect(calculator.calculateTotal(100, 0.1)).toBe(110);
});

// Navigator suggests implementation
class PriceCalculator {
  calculateTotal(price, taxRate) {
    return price * (1 + taxRate);
  }
}

// Driver writes next test
test('should handle zero tax', () => {
  const calculator = new PriceCalculator();
  expect(calculator.calculateTotal(100, 0)).toBe(100);
});

Continuous Integration


# .github/workflows/ci.yml
name: CI

on: [push, pull_request]

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: Install dependencies
        run: npm install
      - name: Run tests
        run: npm test
      - name: Check coverage
        run: npm run test:coverage
      - name: Lint code
        run: npm run lint

Best Practices

  • Regular code reviews
  • Pair programming sessions
  • Continuous integration
  • Knowledge sharing
  • Regular retrospectives

Conclusion

TDD is most effective when practiced as a team. By following these practices, you can build a culture of quality and continuous improvement.

"Quality is not an act, it is a habit." - Aristotle