test-driven-development

Test-driven development prevents regressions by requiring a failing test that reproduces the bug before writing any fix, ensuring the same issue cannot silently return. This red-green-refactor workflow guarantees behavioral coverage for APIs and business logic.

The red-green-refactor cycle is a unit testing workflow where you write a failing test first, then implement minimal code to pass it, and finally refactor while keeping all tests green. This enforces correct software behavior through tight, test-first discipline.

To fix bugs using a test-first approach, write a failing test that reproduces the exact failure first, then implement the minimal code to pass the test, and finally refactor. This ensures the regression is permanently prevented and changes remain atomic.

Yes, you can use test-driven development for data transformations and business logic where correctness under edge cases matters. It enforces a failing-test first workflow that guarantees behavioral coverage across APIs, logic modules, and data processing.

In a test-driven development workflow, you should commit code after each complete red-green-refactor cycle is fully green. This practice creates atomic, reviewable changes so the design narrative remains traceable and easy to review.