test-driven-development

Test-driven development prevents regressions by enforcing a Red-Green-Refactor cycle where tests are written before implementation code to verify requirements and prevent bugs.

To write a new feature using TDD, first write a failing test defining the requirement, then write minimal implementation code to pass the test, and finally refactor the code to improve quality while maintaining passing tests.

Use test-driven development during refactoring to ensure new code doesn't break existing functionality. The methodology requires strict adherence to testing principles, verifying requirements before implementing changes to prevent regressions.

Test-driven development is applicable to bug fixes in software development. You write a failing test that reproduces the bug, implement the minimal code fix to make the test pass, and then refactor to ensure code quality.

Test-driven development requires strict adherence to testing principles and verification steps, which may slow down initial development speed. It enforces writing tests before implementation for all tasks including new features and refactoring.