I = typing.Never,
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.
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Олеся Мицкевич (Редактор отдела «Силовые структуры»)