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>Part of the code we want right now requires a unit test with dependency injection to match an interface.

What exactly do you mean by this?

We ask that the code they write have a unit test. The nature of that unit test is that it has a dependency. They can mock however they like, but passing in an object that represents the dependency (dependency injection) is the easiest and most straight forward way to do that. That object should have a method on it (a know method, with a known signature, also known in some circles as matching an interface).

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