实例允许用户拥有独立自主的环境，用于生产、测试和开发。

Instances allow users to have separate, independent environments for production, test, and development purposes.

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它有可能会违反测试的独立性，并引入非预期的混乱。

It has the potential to violate the independence of the tests and introduce unexpected coupling.

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试着改变一下测试用例的顺序，以确认他们是否具有独立性。

Try changing the order of your test cases to confirm their isolation.

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There's unit testing, where we validate each piece of the program independently.

一种是单元测试，也就是,分别验证程序中的每一个独立部分。

麻省理工公开课 - 计算机科学及编程导论课程节选

Because usually it doesn't work. And so one of the things that I think is very important is to always begin by testing each unit.

因此我认为非常重要的一件事情,就是开始测试的时候先对,每个独立单元进行测试。

麻省理工公开课 - 计算机科学及编程导论课程节选

So before I try and run my program, I test each part of it independently.

因此在我尝试运行我的程序之前，我都会对它的每个部分进行独立的测试。

麻省理工公开课 - 计算机科学及编程导论课程节选