本文阐述了测试驱动开发（TDD）的三大基本原则：编写失败的单元测试前不得编写任何生产代码；仅编写足以使测试失败的单元测试；仅编写足以通过当前失败单元测试的生产代码。这些原则确保了代码质量和开发效率。
1. You are not allowed to write any production code until you have first written a failing unit test.
2. You are not allowed to write more of a unit test than is sufficient to fail—and not compiling is failing.
3. You are not allowed to write more production code that is sufficient to pass the currently failing unit test.
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