This document provides an overview of test-driven development (TDD). TDD involves writing tests before writing code to ensure new functionality works as intended. Key principles of TDD include writing failing tests first, then code to pass the tests, and refactoring code while maintaining all tests. TDD results in higher quality, flexible, readable and maintainable code. It also helps improve both internal code quality and external functionality through a well-designed development process focused on automated testing.
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