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You, the user of the library, don't care about finding any bugs in parts of the library that your application isn't using.

Your tests will be testing the parts of code in the library that your application uses, which is the part that matters to you.

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You can still have bugs in parts of code that you use (or would use) given the right inputs. The problem is making your tests so diverse that they test every possible input.

You could. But you'd miss those bugs if you write that code yourself any way.

Are you sure you understand how programming and testing works?

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