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The migrations loader prevents the use of PEP-420 namespace packages for holding apps' migrations modules. Previously the loader tested for this only by checking that app.migrations.__file__ is present. This prevented migrations' being found in frozen Python environments that don't set __file__ on any modules. Now the loader *additionally* checks whether app.migrations.__path__ is a list because namespace packages use a different type for __path__. Namespace packages continue to be forbidden, and, in fact, users of normal Python environments should experience no change whatsoever.
To run the test suite, first, create and activate a virtual environment. Then
install some requirements and run the tests::
$ cd tests
$ python -m pip install -e ..
$ python -m pip install -r requirements/py3.txt
$ ./runtests.py
For more information about the test suite, see
https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/unit-tests/.