tdd

Test-driven development is a test-first workflow that validates desired behavior through tests before implementing code. This iterative red-green-refactor cycle reduces regressions and keeps code clean, ultimately accelerating feature delivery by minimizing work in progress.

To start red-green-refactor, write one end-to-end test capturing a single observable behavior, then implement only the minimum code required to make it pass. This iterative workflow enforces vertical slicing and incremental behavioral validations across feature campaigns.

Test-driven development works effectively for integration testing and API design by enforcing public-interface testing. Tests guide API design by validating small, observable behaviors that reflect public interfaces, maintaining long-term software quality across feature work.

Use test-first development when building features that require robust test suites and behavioral validations. It minimizes regressions during iterative refactors and ensures software projects maintain confidence in desired behavior through end-to-end verification before code implementation.

Test-driven development requires discipline to enforce public-interface testing and vertical slicing. It may slow initial feature delivery due to writing tests first, but minimizes regressions and refactors long-term by validating explicit behavioral validations incrementally.