If you change the behavior of the code, change the documentation accordingly.

如果您改变了代码的行为，就要相应地改变文档。

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Rewriting code alters the behavior and even the contract of code, while refactoring preserves its outward interface.

重写代码会修改代码的行为甚至合约，而重构保持对外接口不变。

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If you're like many programmers who aren't fond of commenting code, unit tests are a way of documenting your code behavior.

如果您像其他许多程序员一样不喜欢为代码加注，则单元测试是记录代码行为的一种方法。

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