Test-Driven Development (TDD)

Test-driven development works by enforcing the Red-Green-Refactor cycle: writing failing tests first, implementing minimal code to pass, and refactoring. This iterative process verifies behavior and prevents regressions during software development.

Start writing failing tests by defining expected behavior for specific scenarios, such as successful login or account lockout. Confirm the tests fail before writing any implementation code to ensure verifiable behavior.

Common failure patterns to avoid in test-driven development include testing mocks or focusing on implementation details. Write behavior-focused tests to ensure code quality and prevent regressions effectively.

Use the Red-Green-Refactor cycle during all new feature development to ensure code quality. It guides you through writing failing tests, implementing minimal passing code, and refactoring to verify behavior iteratively.

Test-driven development does not require specific testing frameworks. It provides principles for writing effective tests and guidelines for avoiding common pitfalls, which can be applied across agile environments to ensure code correctness.

Write tests before implementation code to enforce a rigorous development process that ensures correctness. This prevents regressions and verifies behavior by requiring you to define expected outcomes prior to feature development.