This style of testing has dual purposes: testing your implementation, and building requirements design documentation as you test.
这种风格的测试具有双重作用：测试实现并在测试的同时构建需求设计文档。
What really matters is free full documentation, free full implementation source code, and of course the absence of any patent risk.
最主要的只是自由的完整的文档，自由的可以实现的源代码，当然还要免除软件专利的危险。
Keeping documentation in line with the implementation is notoriously difficult.
保持文档与实现的一致是众所周知的难题。
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