Unit testing in OOP is the test of the smallest testable piece of code: the class. It’s used to make sure a single class does what it’s supposed to do. After some years of experience, I got to see unit testing as a crucial part of the software development process, since they give me some important advices that I couldn’t identify before writing them. Not being able to write a good and simple unit test might be a sign of code smell, advising you that your code is too coupled or is being responsible for too many things.
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