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    <p>Alright, I don't have the file-system-mock library you wish for (though it may be out there somewhere and would be cool), but this may help. One of the interesting concepts the "behaviorist" school of unit testing thought has come up with is the idea of an "outgoing interface". In some cases, there seems to be as much value in taking the calls an object makes to the entire universe of things outside of itself, and turning them into an interface, as there is in the typical act of making an interface for methods the outside world can call <strong>on</strong> your object).</p> <p>In this case, you might consider, instead of mocking the entire file system, making one or more logically coherent interfaces for the answers and services your object needs from the outside world. The calls would merely answer the questions you need answered ... not dictate implementation. Then, you can use dependency injection as you mentioned to inject in the implementation you desire for your tests. And you'll probably use Moq to do so since you're familiar with it.</p> <p>So, your "outgoing interface" might have a method called DoesFileExist(). It might accept a path. Or, if there is a "higher level" business question your object is trying to answer, and seeing if a file exists is merely the <strong>way</strong> that question is answered, then your outgoing interface might not have a method about file existence at all. It might instead be something like "DoIAppearToHaveAccessToTheFileServer", or even "IsThereAPreviouslySavedGame".</p> <p>This is some work, but might be truer to the principles of good unit testing ... let your object-under-test express what it is trying to do, and let your unit tests test it and only it. Just a thought ... hope it helps.</p>
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    1. PONeeded: File system interfaces and implementation in .NET
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    1. USCharlie Flowers
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    1. COIsn't this sort of thing also called the "visitor pattern"?
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      1. USbrendanjerwin
    2. COBut still, when I implement the "outgoing interface", I have to interact with the file system. For instance, implementing the "IsThereAPreviouslySavedGame" method might actually check if a specific file exists. So I still need the IFile interface, so I can unit-test the implementation properly.
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      1. USRon Klein
    3. CONo, wait. What I mean is, "IsThereAPreviouslySavedGame" would be a boolean method. And your code would call it. For the unit test, you would merely "inject" a mock implementation that returns true, and make sure the resulting behavior was correct for that case. No need for the file system.
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      1. USCharlie Flowers
 

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