tdd-test-driven-development

To implement test-driven development, you follow a strict red-green-refactor cycle by writing a failing test first, creating minimal code to pass it, and then refactoring. This ensures code meets tested requirements and prevents regressions.

The red-green-refactor cycle in agile software development is a TDD practice where you write a failing test, implement minimal code to make it pass, and then refactor the code for quality. It ensures all new code is validated against specific requirements.

Writing tests before implementation code enforces the test-first principle, ensuring you define expected behavior upfront. This prevents bugs, improves software reliability, and mitigates common rationalizations and anti-patterns found in after-the-fact testing.

Yes, test-driven development supports refactoring existing code by ensuring tests verify behavior before and after changes. The refactoring phase of the red-green-refactor cycle specifically improves code quality while preventing regressions in software development.

You should not use test-driven development when writing throwaway prototypes or exploratory code where behavior is undefined, as the strict test-first principle requires clearly defined, testable requirements to prevent failures and guide implementation effectively.