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TDD testing is a development approach where tests are written before the actual implementation code. This method helps developers clearly define expected behavior upfront, leading to better design decisions and fewer defects later in the development process. By thinking about test cases first, teams gain a deeper understanding of requirements before writing logic.

One of the biggest advantages of TDD testing is the fast feedback loop it creates. Developers immediately know whether their code meets expectations, which encourages smaller changes and safer refactoring. This approach also improves maintainability, as well-tested code is easier to update and scale over time without introducing regressions.

For learners and teams alike, TDD testing promotes discipline, clarity, and confidence in code. Tests act as living documentation, making it easier for others to understand how the system works and collaborate effectively on shared codebases.