Be prepared to test with various storages or just with the usual FileSystemStorage, but with an overridden location (e.g. when the storage is created in another apps test before MEDIA_ROOT defined for tests gets set).
It would be nice to also find a way to ensure files are cleaned up with non-file-system storages in case test_translated_models_instance fails in the middle.
Merge branch 'feature/testing-with-app-settings' into develop