test-driven-development

To start test-driven development, write a failing test first, implement the minimal code required to pass it, and then refactor while keeping tests green. This enforces a strict test-first workflow to prevent unverified production changes.

The best way to fix bugs with unit testing is to write real failing tests that verify behavior before changing code. Avoid using mocks as substitutes, relying instead on real tests to ensure correctness and speed up debugging through immediate feedback.

Test-driven development applies to refactoring across languages and stacks. You can enforce a tests-first workflow on existing features by writing real tests to verify behavior, ensuring minimal regressions when modifying code.

A test-first workflow ensures code correctness by providing immediate feedback and minimizing regressions. By relying on real tests rather than mocks, you speed up debugging and prevent unverified production changes from entering your stack.

You should avoid mocks when behavior verification is critical to correctness. Relying on real tests rather than mocks as substitutes ensures your test-driven development cycle accurately verifies software quality across features and refactors.