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POUnit testing a third party API with sealed concrete classes
 

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    <p>just started TDD and all was going well until I hit this brick wall.</p> <p>I am writing a facade around a third party API. The API is quite nice in that everything is accessed via interfaces, so is easily mockable when testing my facade. </p> <p>The whole API is accessed via a root interface and there is a deep hierarchy of interfaces you can drill down into from this. My facade takes this root interface in its constructor in standard IoC practice.</p> <p>TDD was going fine, with the slight pain that mocking was getting a bit complex when using deep interfaces, since I have to mock the entire interface tree. No biggie though, I just maintained a helper function that built the mock. It does make me wonder if I'm using the right approach though.</p> <p>Anyway, halfway down the tree I have now suddenly hit a sealed concrete type, with no public constructor, so I have no way of mocking it. This is causing my tests to fail since the mocked API always returns null for this member.</p> <p>The only way I can see around this is to create my own interface for this type, and have a virtual method on my facade for accessing it. However, this seems messy to me since I have no way of enforcing access to the type through this method, and it will be easy to forget. eg, it's natural to use:</p> <pre><code>ConcreteType c = SomeInterface.ConcreteMember; </code></pre> <p>instead of:</p> <pre><code>IConcreteType c = GetConcreteMember(SomeInterface); </code></pre> <p>Forgetting this would cause tests to fail.</p> <p>Am I missing something fundamental? As I said I am very new to unit testing.</p> <p>ps. I am using Moq.</p>
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