Django test with custom models

SetupDjangoTestApp.py

#https://code.djangoproject.com/ticket/7835


# __init__.py
from django.apps import AppConfig, apps

def setup_test_app(package, label=None):
    """
    Setup a Django test app for the provided package to allow test models
    tables to be created if the containing app has migrations.

    This function should be called from app.tests __init__ module and pass
    along __package__.
    """
    app_config = AppConfig.create(package)
    app_config.apps = apps
    if label is None:
        containing_app_config = apps.get_containing_app_config(package)
        label = f'{containing_app_config.label}_tests'
    if label in apps.app_configs:
        raise ValueError(f"There's already an app registered with the '{label}' label.')
    app_config.label = label
    apps.app_configs[app_config.label] = app_config
    app_config.import_models()
    apps.clear_cache()
    
# my test app utils/tests/
setup_test_app("utils.tests", "utils_tests")


'''
Which when called from app/tests/__init__.py as setup_test_app(__package__) will 
create an app_tests appconfig entry and auto-discover the models automatically. 
Since the *.tests modules should only be loaded on test discovery the app and 
its models will only be available during tests. Keep in mind that if your test 
models reference models from an application with migrations you'll also need to 
manually create migrations for these tests models but once that's done you should 
be good to go.
It does feel less magic and convention based than Ashley's solution as it prevents 
conflicts between models and allows multiple test apps per app from any test package structure. Thoughts?
'''