test-driven-development

The Test-Driven Development cycle requires writing a failing test first, creating minimal code to pass that test, and then refactoring the code for quality. This methodology prevents bugs before they are introduced and makes software easier to maintain.

To write tests before implementation, you define expected behaviors through failing tests first, then develop the minimal production code required to make those tests pass, and finally refactor for clarity. This ensures your software is always preceded by validation.

You should use TDD when implementing new features, such as user authentication, to ensure reliability and bug prevention. It enforces code quality by catching errors early through a structured validation cycle before any production code is finalized.

Yes, Test-Driven Development prevents bugs by requiring tests to be written before the actual implementation code. This early validation catches errors immediately and ensures that all production code is backed by passing tests during the refactoring phase.

Common TDD anti-patterns involve skipping the failing test phase or writing excessive code before validation. Avoid them by strictly following the Red-Green-Refactor cycle and using a validation checklist to ensure minimal code passes tests before refactoring.

You refactor code safely after writing tests by modifying the implementation for clarity and efficiency only after the minimal code passes the initial failing tests. This maintains reliability while improving code quality without breaking functionality.