只要您保持测试和代码的同步(这是实践的关键点)，如果有程序员想知道系统能做什么，他或她可以参看测试。
As long as you keep your tests and code synchronized (and that's the whole point of the practice), if a programmer wants to know what the system does, he or she can look at the tests.
如果你不止使用一台电脑，在不同电脑之间保持书签和密码同步可能有点麻烦。
If you use more than one computer, keeping bookmarks and passwords synched between the machines can be a bit of a hassle.
如果文档直接嵌入在代码中，就非常容易维护文档，有助于保持代码与文档同步。
It's also much easier to maintain your documentation if it's embedded directly in the code to help keep everything in sync.
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