Mockito and ScopedModel

I'm trying to fix a test since I have implemented ScopedModelDescendant to get data to fill up my page with information for the user.

The issue I'm facing is that it seems I can not mock ScopedModel with mockito. Somehow is asking me to specify some properties which does not occur with other classes I have been mocking so far.

This is how my app is being configured

So far so good, my app is working properly and I can invoke ScopedModelDescendant anywhere without injecting anything in my widgets. But when running my test I'm getting this error

And this is how I'm configuring my test

I know I should be doinng something like this

class MockScopedModel extends Mock implements ScopedModel<MockMainModel>{}

But if I do that in order to mock sopedModel I get this error/warning

Does anyone know how to mock the scopedModel properly? Am I missing something here?