test-driven-development

Test-driven development relies on automated tests to guide design and verify expected behavior, so an automated testing framework is required to execute the red-green-refactor cycle and prevent regressions.

The red-green-refactor cycle in test-driven development starts with writing a failing test, implements the minimal code to pass it, and then continuously refactors while keeping all tests green to ensure reliable delivery.

To write tests before implementation, start by writing a failing test for the target behavior, implement the minimal code to make that test pass, and refactor while keeping all tests green to prevent regressions.

Yes, TDD applies to bug fixes and refactors across codebases by enforcing failing tests first to guide design, ensuring software behavior matches expectations and preventing regressions during critical changes.

Writing code without tests leads to undetected regressions because no automated safety net exists to catch behavioral breaks; TDD solves this by enforcing failing tests first to document intended behavior and catch issues early.

Test-driven development relies on automated tests to guide design and verify expected behavior, so an automated testing framework is required to execute the red-green-refactor cycle and prevent regressions.