TDD is like having a target before you start shooting - you write a test that describes what you want your code to do, then write code until the test turns green, and finally polish the design so everything still works. This “write test → write code → refactor” cycle helps keep code simple and testable, and provides fast feedback that often leads to higher quality.
The methodology forces you to think about requirements and interfaces first, rather than just starting to implement functionality and hoping tests cover it later. It becomes a disciplined loop of small steps - a test, a small code change, a refactor - repeated until the feature is complete.
For developers familiar with the basics, TDD is an excellent way to improve code quality and structure. It requires some extra planning and discipline upfront, but once adopted you can work faster, with fewer bugs and greater confidence that changes won’t break existing functionality.
