Only by testing can you be confident that changes you make to one part of a system will not break another part somewhere else.

只有通过测试，您才能确信您对于系统中的某一部分所做的改变不会中断其他地方的另外一部分。

youdao

For example, when you make a change in the code, make sure you do regression testing to be sure you did not break any other code in the program.

例如，当在代码中进行更改时，请确保进行回归测试，从而确保不会破坏程序中的任何代码。

youdao

Instead, I'll break down some of the more subtle testing decisions that every Ruby project lead must eventually make.

与之相反，我会对每个Ruby项目主管最终都必须要做的一些微妙的测试决定详加介绍。

youdao