Test runner returning error with multi file models

I have an app with multi-file models

myapp/

   |- models/

       |- __init__,py

       |- user.py

When I am running python manage.py test it returns:

RuntimeError: Conflicting 'user_groups' models in application...

But when I use only a single `models.py` file it works. Is this a bug? or am i doing something wrong?

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