How should I mock this abstract class with Moq?

In a case like this, I would treat XDocument as a standard, non-mockable object like string s and most POCOs and native types. That is to say, you should create a real (non-mocked) SerializableNodeTree to return from IAsset.Info .

In this case I would create a test double that derives from your abstract class. That'll give you what you need in your test.

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