Test-Driven Development (TDD)

Test-Driven Development (TDD) is a fundamental concept in Agile Testing and Quality that emphasizes writing automated tests before developing the actual code. In TDD, developers begin by writing a test case that defines a desired improvement or new function. This test initially fails because the feature hasn't been implemented yet. The next step is to write the minimal amount of code necessary to pass the test. Once the test passes, the code is then refactored to meet acceptable standards without altering its functionality. This cycle—write a test, make it pass, and refactor—is repeated for each new featureTDD offers several benefits in an Agile environment. It ensures that the codebase is thoroughly tested at every stage, reducing the likelihood of defects and errors. By focusing on testing first, developers gain a clearer understanding of the requirements and design cleaner, more efficient code. TDD also facilitates better collaboration between developers and testers, as it blurs the lines between development and testing roles. Automated tests become a living documentation of the code, making it easier for new team members to understand the system's functionality. In the fast-paced Agile framework, TDD supports continuous integration and delivery by providing immediate feedback on code changes, thereby enhancing the overall quality and reliability of the software product.