最后，你又提到专业化的标志就是拥有良好的单元测试，而TDD则是达成这一目标的一种方法而已。

At the end, you said the hallmark of the professional is to have good unit tests, and TDD is one way of achieving that.

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使用位测试，可以容易地测试标志变量上的特定标志。

Using bit tests, you can easily test for specific flags on a flag variable.

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区别很微妙：在一个失败的样例中，不带可选标志运行测试可以帮您了解运行总时间。

The difference is subtle: running the test without the optional flag helps you understand the total time, even in the case of a failure.

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