Should UserAccountService implement an interface for testability?

[tafs7]

I noticed that UserAccountService class is injected in sample controller, but should this class implement an interface, so that other classes (such as this controller) that depend on it could be unit tested, while mocking IUserAccountService?

[brockallen]

The methods should all be virtual, so you can just derive and override the ones you want for testing. Or you can mock the entire thing. Either way.