WatchKit Unit Testing with Swift

I want to unit test some of my WatchKit code (written in Swift). But I can't find a way to instantiate a WKInterfaceController without getting a bad access error.

I read that there seems to be little documentation about said topic and I can't really find something useful.

I found a couple of questions here:

http://ift.tt/1c1DIYr

But didn't get an answer.

Any ideas? or information?

Thanks :)