test-driven-development

Test-driven development enforces writing a failing test before implementation to ensure software works as intended. It reduces regressions and guides design by driving features with tests-first discipline, quick feedback loops, and clear behavior definitions.

To apply the red-green-refactor cycle, write a failing test first, implement the minimal production code required to pass it, then refactor while keeping tests green. This ensures immediate verification via automated tests throughout the development workflow.

Yes, test-first workflows support consistent development for bug fixes, refactors, and behavior changes. By writing failing tests before implementation, you ensure automated tests guard against regressions and verify immediate behavior changes across teams.

The best way to start writing tests before implementation is to define clear behavior expectations through a failing test. Then, implement the minimal production code required to pass the test, ensuring your testing drives design and satisfies disciplined test-first workflows.

Writing a failing test first helps with safer refactoring because it establishes immediate verification via automated tests. Keeping tests green during refactoring ensures your changes do not introduce regressions, guarding against behavior changes and maintaining software quality assurance.