Unit testing is essential not just as a developer's choice; it is a well-established engineering practice that helps reduce costs, enhance design, and speed up delivery. By quickly and continuously validating small pieces of logic, teams create a reliable safety net that aids in refactoring, scaling, and fostering innovation. Whether you are developing your first testing suite or improving an established pipeline, the core principles remain unchanged: test behavior, keep tests fast and straightforward, and seamlessly integrate them into daily development activities.