They also take longer to run, so running a lot of them together can increase your overall test time dramatically.

当然它们也要花更多时间运行，所以同时运行很多的组件测试会显著地增加总的测试时间。

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This is particularly useful towards the end of a release cycle, where small numbers of changes are being made and running large-scale test runs is prohibitively time consuming.

这对于发布循环的末期是特别有用的，此时要做出少量的变更，并且大范围的运行测试会过高地耗费时间。

youdao

Programmers don't usually have to test whether the user running the program is entitled to read a data file or set the system time.

程序员通常不必测试运行程序的用户是否有权读取数据文件和设置系统时间。

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