Unittest a workflow

There is a lot of information about unittesting of XAML workflows to be found on the internet, but so far I have only been able to test really simple ones, i.e. no user input and no external services. Does anyone have any examples of how to do this?

I did manage to use XamlInjector and inject a stub class in place of a QueryTask, but I can't seem to use a true (https://github.com/Moq/moq4) Moq -ed object, so I would have to implement the stub for every test :-/

Any information about testing workflows in general is appreciated.