test-driven-development

The red-green-refactor workflow in test-driven development entails writing a failing test first, implementing the minimal production code to make it pass, and then refactoring safely with confidence. It enforces test-first discipline to ensure correct functionality and safer refactoring.

To start applying TDD when adding new features, write a failing test that defines the desired behavior before writing any production code. Then implement the smallest amount of code needed to make the test pass, ensuring early failure validation and incremental design.

You should use test-first verification when adding new features, fixing defects, or revamping architecture. It guarantees test coverage from the outset, eliminates ambiguity in feature behavior, and reduces regression risk by preventing explicit failed tests.

Yes, test-driven development works for fixing defects and revamping architecture by preserving behavior through rigorous test-first discipline. It ensures safer refactoring by validating failures early and maintaining explicit RED-GREEN-REFACTOR steps regardless of feature size.

The best way to ensure safe refactoring is enforcing test-driven development with explicit RED-GREEN-REFACTOR steps. By writing failing tests first and implementing minimal code to pass them, you guarantee test coverage from the outset and significantly reduce regression risk.

Writing a failing test before production code eliminates ambiguity in feature behavior by enforcing early failure validation. This test-first discipline guarantees test coverage from the outset, ensuring correct functionality and enabling safer refactoring with incremental design.