As you can see, I’ve highlighted that every level of the tests is optional. That’s because it should be intentionally deliberated on which levels of tests will bring the most value in a given application. Writing tests is a cost, and bad tests are a waste. Duplicated coverage might seem like an extra protection, but it will be a burden during refactoring.
Iterable, Literal[0]] to get the type of something iterable will
。业内人士推荐体育直播作为进阶阅读
这些书是刚买来的，有些甚至是新的。没有人会读它们，它们存在的唯一目的，就是被销毁。
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