Error when running tests while using multi-file models

I am using multi-file models on my app:

Example file structure:

app/

    |- models/

        |- __init__.py

        |- user.py

When I run `python manage.py test` it returns:

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

But when I join then into one file (models.py) it works? Am I doing something wrong?

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