test-driven-development

Test-first development requires writing failing tests that define expected behavior before creating the implementation, ensuring the feature works as intended from the start. You write a failing test for the desired outcome, then write just enough code to pass.

The Red-Green-Refactor cycle is a structured TDD process: write a failing test, create minimal code to make it pass, and then clean up the code. This methodology ensures code quality and prevents regressions during refactoring.

Test-driven development is needed for bug fixes and refactoring to prevent bugs before introduction and make refactoring safer. It enforces a rigorous testing methodology that ensures code reliability throughout all development stages.

Yes, TDD methodology is applicable to all stages of development including new features, bug fixes, and refactoring existing code. It guides you through the test-first process regardless of the development context.

The best way to prevent regressions during agile development is enforcing strict testing principles through the Red-Green-Refactor cycle. This methodology facilitates safe refactoring and improves developer productivity by catching bugs early.

Strict testing requires failing tests first because this defines the expected behavior clearly before implementation begins. This commitment to test-first principles ensures code reliability, prevents bugs, and makes subsequent refactoring safe.