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This document provides an overview of test-driven development (TDD). It discusses what TDD is, how the TDD process works through iterations of writing tests first then code, and the benefits it provides like increased confidence in changes and documentation of requirements. The document covers TDD basics like the red-green-refactor cycle and challenges in unit testing like dependencies. It emphasizes focusing on writing tests before code and not designing code in your head first. The document also compares mocking frameworks and argues the benefits of commercial frameworks like Typemock Isolator.






















































