test-driven-development

Test-driven development starts by writing a failing test that defines expected behavior before any production code is written. You then implement the code to pass the test and clean it up during refactoring.

The Red-Green-Refactor cycle is a structured workflow for writing software. Red means writing a failing test, Green means writing code to pass the test, and Refactor means cleaning the code while keeping tests green.

Test-first development prevents bugs by requiring a failing test before implementation. This clarifies design and expected behavior early, minimizing regressions and catching errors before code is introduced.

Use TDD when you need robust, verifiable, and maintainable code for new features or bugfixes. It enforces a disciplined approach that prevents regressions and clarifies design better than post-implementation testing.

Yes, TDD fits agile software development by enforcing a structured Red-Green-Refactor workflow. It ensures code quality and prevents regressions while allowing iterative feature development and continuous refactoring.

TDD does not limit refactoring but relies on passing tests to ensure safety. If the initial test coverage is insufficient to define behavior, refactoring may introduce undetected regressions despite following the cycle.