The concept was already illustrated above on the image with Sociable Unit Tests. Also the name is likely self-explanatory and there is a good article online about it, so I won’t be too exhaustive here (see: Resources). The crux is that it’s acceptable - if circumstances require it - to add an extra suite of tests for particular classes, methods, or functions. This does not violate the rules of Sociable Unit Tests (it will just supplement them).
На Западе рассказали о проблемных американских танках ТайваняMWM: Американские танки M60 армии Тайваня морально устарели
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