test-driven-development

Test-driven development is a software development methodology that enforces a strict red-green-refactor cycle. You write a failing test first, implement minimal code to pass it, then refactor, preventing regressions and improving quality.

To write tests before implementation code, follow the red-green-refactor cycle: define expected behavior with a failing test, write minimal production code to pass it, then refactor. This ensures systematic verification of all features.

Test-driven development improves agile software projects by preventing regressions and ensuring quality through systematic verification. It addresses common rationalizations for skipping tests, enforcing that all production code is preceded by a failing test.

You need the red-green-refactor cycle whenever adding new features or refactoring existing code. It mandates writing a failing test first, then minimal code to pass, ensuring systematic verification and preventing regressions throughout development.

Common rationalizations for skipping TDD include time constraints and perceived complexity. This methodology addresses these excuses by providing clear guidelines for writing effective tests, ensuring quality assurance remains integral to software development.