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Testing every implementer of an interface with the same tests using NUnit

You have an interface and multiple implementers of that interface. You want to test all those implementing classes using the same tests. And you do not want to repeat yourself. That would be … like … Gah!

Using a unit test framework like NUnit that is a breeze.

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How do I test an interface? Should I even do that?

Every so often this comes up: I have an interface. It has methods. I should unit test everything. So I should test this interface. But how? It doesn’t have an implementation…?!




No. Of course you don’t test the interface.

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