Any time we make a corner case into an error we need to carefully specify exactly what the error case is so that we can implement it correctly and test it confidently.

每当我们让一种特殊情况变成一个错误时，我们需要细心辨别出错误情况究竟是什么，这样我们才能正确地执行它，并且自信地测试它。

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Every error case still spends design, implementation and test budget that could have been spent elsewhere.

每种错误情况仍然花费设计、施行和测试的预算，而在这上面花费的预算原可以花在其它地方。

youdao

This could be used for the purpose of testing selpg, when you may only want (for some test case) to see the error messages, not the normal output.

这可作为测试selpg的用途，此时您也许只想(对一些测试情况)检查错误消息，而不想看到正常输出。

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