敏捷软件开发和极限编程二者均提倡在开发源代码之前编写单元测试用例。
Agile software development and extreme programming both promote writing unit test cases before developing the source code.
尽管经常与敏捷过程连接在一起，例如极限编程，但是概念和实践都不是什么新的——只是众所周知的软件开发最佳实践上的一种变体。
Although often linked with Agile processes, such as eXtreme programming, the concept and practices are nothing new — just a variation on well-known software development best practices.
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