test-driven-development

To start test-driven development, write a failing test for the desired behavior, implement the simplest minimal production code to pass it, then refactor while keeping all tests green. This enforces safe, incremental delivery for new features.

The red-green-refactor loop in TDD is the core practice of writing a failing test, implementing minimal production code to pass it, and refactoring while the test suite remains green to catch regressions early.

Yes, test-first development applies across bug fixes and refactoring to maintain design integrity. You write a failing test for the behavioral change, implement the fix, and refactor only while the test suite remains green to ensure safety.

Writing tests first improves software quality by reducing debugging time and yielding safer, better-designed software. It forces a failing test before implementation and guides incremental development to catch regressions early.

The best way to ensure safe incremental delivery with TDD is to enforce the red-green-refactor loop with minimal production code and strict verification, catching regressions early and maintaining design documentation.

You need test-driven development for behavioral changes when you want to guide the full TDD cycle and maintain design integrity. It forces a failing test before implementation to ensure safe, incremental delivery.