test-driven-development

Test-driven development is a test-first practice where you write a failing test, implement the minimum code to pass it, then refactor to improve code quality and maintainability.

To write a test first for a new feature, start by defining the expected behavior using syntax like 'test("Description of test", async () => { ... });', then write the implementation code that makes the test pass.

Yes, test-driven development works for bug fixing by having you write a failing test that reproduces the specific bug first, then fixing the implementation code to make that test pass and prevent regressions.

The best way to ensure code quality is adopting test-first practices, which guide you to write automated tests that verify functionality and catch bugs early before the actual implementation code is written.

You should not use the test-first approach when exploring experimental prototypes or throwaway scripts where long-term maintainability and automated regression testing are not required goals.