Factory for iOS Models on iOS

I'm starting a new project and the I have a really hight testing requirements. The app is very "data intensive" lots of models and models nested.

I'm trying to think a good way to be able to organize and create fake models I'm going to be using to test ViewModels.

I'm looking for something similar to FactoryGirl on ruby but I can't find anything similar for iOS.

Any advise?