Thank you for bringing up the question. I have attached a sample project that uses Nunit and uses the Setup/ TearDown model to show mocking of an interface member. I used JustMock Q2 SP1 for this purpose .
Hope this answers your question.
Regards,
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items