test-driven-development

To implement test-driven development, you must write a failing test before any production code is written. This enforces the test-first methodology and ensures new features are built around specific requirements.

The Red-Green-Refactor cycle in TDD is an iterative process where you write a failing test, create minimal code to make it pass, and then refactor. This cycle guides the entire development process to improve code quality.

Writing tests first for a bug fix requires creating a test that reproduces the failure before changing production code. This ensures your fix addresses the specific regression without breaking previously working logic.

You need to use test-first methodology in agile development when adding new features or refactoring to prevent regressions. It mandates strict rules against skipping tests, ensuring code reliability throughout the process.

You cannot skip tests when refactoring code under this methodology. The process requires a failing test first to verify the need for changes, ensuring your refactoring improves code quality without introducing regressions.