What makes TDD so effective is the automation of your programmer (unit) tests, and the great news is that the only tools you need are available for free on the Internet.

使TDD更加有效的原因是单元测试自动化，而且这些自动化单元测试的工具可以从Internet上免费获得。

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When we write unit tests we should strive for code that is free of side effects, and IO certainly falls under this category.

当我们编写单元测试时，我们应该尽量编写没有副作用的代码，IO当然也属于这一类。

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Whether a developer USES test-driven development (TDD) or creates unit tests after writing the code, the evidence is clear that unit tests help produce high-quality, bug-free code.

无论一个开发人员是在进行测试驱动的开发(TDD)还是在编写代码后创造单元测试，有一点是十分明显的，那就是单元测试有助于产出高质量、无缺陷的代码。

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