test-driven-development

Test-driven development is a workflow where you write a failing test, implement minimal production code to pass it, then refactor. The red-green-refactor cycle enforces this test-first discipline to prevent silent bugs and ensure safer code evolution.

To start writing unit tests before production code, write a failing test that expresses the desired behavior for your new feature. Then, implement the simplest deterministic production code required to make that failing test pass.

Yes, test-driven development is suitable for bug fixes and refactoring across any project using automated tests. Writing a failing test first validates the bug, and minimal code changes ensure deterministic behavior while preventing regressions.

The best way to enforce a testing-first workflow is adopting strict test-driven development. By requiring validation that tests fail first and guiding minimal production changes, it establishes deterministic development and reduces later debugging time.

Test-driven development works across any project that uses automated tests. It is framework-agnostic, focusing on the test-first discipline and minimal code changes rather than requiring specific testing tools or platform dependencies.

You should not use a test-first approach when exploring unfamiliar prototypes where behavior is non-deterministic. Test-driven development requires writing deterministic tests first, making it less suited for highly experimental or volatile code paths.