The document discusses test-driven development (TDD) and the three laws of TDD. It begins with the author explaining their initial experiences with TDD and some challenges they faced. It then presents the three laws of TDD which state that you must write a failing test before production code, only write enough test code to fail, and only write enough production code to pass the test. The document provides examples of using TDD with small steps and emphasizes writing one test at a time and improving the code base. It concludes by inviting the reader to try TDD and provides some additional resources on transformations and the transformation priority premise.
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