def user_model_swapped(**kwargs):
    if kwargs['setting'] == 'AUTH_USER_MODEL':
        apps.clear_cache()
        try:
            from django.contrib.auth import get_user_model
            UserModel = get_user_model()
        except ImproperlyConfigured:
            # Some tests set an invalid AUTH_USER_MODEL.
            pass
        else:
            from django.contrib.auth import backends
            backends.UserModel = UserModel

            from django.contrib.auth import forms
            forms.UserModel = UserModel

            from django.contrib.auth.handlers import modwsgi
            modwsgi.UserModel = UserModel

            from django.contrib.auth.management.commands import changepassword
            changepassword.UserModel = UserModel

            from django.contrib.auth import views
            views.UserModel = UserModel 

def user_model_swapped(**kwargs):
    if kwargs['setting'] == 'AUTH_USER_MODEL':
        apps.clear_cache()
        try:
            from django.contrib.auth import get_user_model
            UserModel = get_user_model()
        except ImproperlyConfigured:
            # Some tests set an invalid AUTH_USER_MODEL.
            pass
        else:
            from django.contrib.auth import backends
            backends.UserModel = UserModel

            from django.contrib.auth import forms
            forms.UserModel = UserModel

            from django.contrib.auth.handlers import modwsgi
            modwsgi.UserModel = UserModel

            from django.contrib.auth.management.commands import changepassword
            changepassword.UserModel = UserModel

            from django.contrib.auth import views
            views.UserModel = UserModel 

def user_model_swapped(**kwargs):
    if kwargs['setting'] == 'AUTH_USER_MODEL':
        apps.clear_cache()
        try:
            from django.contrib.auth import get_user_model
            UserModel = get_user_model()
        except ImproperlyConfigured:
            # Some tests set an invalid AUTH_USER_MODEL.
            pass
        else:
            from django.contrib.auth import backends
            backends.UserModel = UserModel

            from django.contrib.auth import forms
            forms.UserModel = UserModel

            from django.contrib.auth.handlers import modwsgi
            modwsgi.UserModel = UserModel

            from django.contrib.auth.management.commands import changepassword
            changepassword.UserModel = UserModel

            from django.contrib.auth import views
            views.UserModel = UserModel 

def user_model_swapped(**kwargs):
    if kwargs['setting'] == 'AUTH_USER_MODEL':
        apps.clear_cache()
        try:
            from django.contrib.auth import get_user_model
            UserModel = get_user_model()
        except ImproperlyConfigured:
            # Some tests set an invalid AUTH_USER_MODEL.
            pass
        else:
            from django.contrib.auth import backends
            backends.UserModel = UserModel

            from django.contrib.auth import forms
            forms.UserModel = UserModel

            from django.contrib.auth.handlers import modwsgi
            modwsgi.UserModel = UserModel

            from django.contrib.auth.management.commands import changepassword
            changepassword.UserModel = UserModel

            from django.contrib.auth import views
            views.UserModel = UserModel 

def setUp(self):
        super().setUp()

        apps.clear_cache()
        call_command("migrate", verbosity=0, interactive=False)
        # NOTE: Models must be imported after migrations are run. 

def setUp(self):
        apps.clear_cache()
        call_command("migrate", verbosity=0, interactive=False)

        super().setUp() 

def tearDown(self):
        # Taken from IsolatedModelsTestCase in
        # django/tests/invalid_models_tests/base.py
        from django.apps import apps

        apps.app_configs["tests"].models = self._old_models
        apps.all_models["tests"] = self._old_models
        apps.clear_cache() 

def setUp(self):
        apps.clear_cache() 

def test_clear_cache_clears_relation_tree(self):
        # The apps.clear_cache is setUp() should have deleted all trees.
        # Exclude abstract models that are not included in the Apps registry
        # and have no cache.
        all_models_with_cache = (m for m in self.all_models if not m._meta.abstract)
        for m in all_models_with_cache:
            self.assertNotIn('_relation_tree', m._meta.__dict__) 

def tearDown(self):
        # unregister InvalidStreamModel from the overall model registry
        # so that it doesn't break tests elsewhere
        for package in ('wagtailcore', 'wagtail.core.tests'):
            try:
                del apps.all_models[package]['invalidstreammodel']
            except KeyError:
                pass
        apps.clear_cache() 

def model_cleanup(self):
        create_models()
        importlib.reload(import_module(settings.ROOT_URLCONF))
        app_config = apps.get_app_config("django_models_from_csv")
        hydrate_models_and_permissions(app_config)
        apps.clear_cache()
        clear_url_caches() 

def tearDown(self):
        apps.app_configs['migrations'].models = self._old_models
        apps.all_models['migrations'] = self._old_models
        apps.clear_cache()
        super(MakeMigrationsTests, self).tearDown() 

def tearDown(self):
        apps.app_configs['migrations'].models = self._old_models
        apps.all_models['migrations'] = self._old_models
        apps.clear_cache()
        super().tearDown() 

def setUp(self):
        apps.clear_cache() 

def test_clear_cache_clears_relation_tree(self):
        # The apps.clear_cache is setUp() should have deleted all trees.
        # Exclude abstract models that are not included in the Apps registry
        # and have no cache.
        all_models_with_cache = (m for m in self.all_models if not m._meta.abstract)
        for m in all_models_with_cache:
            self.assertNotIn('_relation_tree', m._meta.__dict__) 

def tearDown(self):
        apps.clear_cache() 

def tearDown(self):
        for model in Article, Authors, Reviewers, Scientist:
            model._meta.managed = False

        apps.app_configs['model_options'].models = self._old_models
        apps.all_models['model_options'] = self._old_models
        apps.clear_cache() 

def setUp(self):
        apps.clear_cache() 

def test_clear_cache_clears_relation_tree(self):
        # The apps.clear_cache is setUp() should have deleted all trees.
        # Exclude abstract models that are not included in the Apps registry
        # and have no cache.
        all_models_with_cache = (m for m in self.all_models if not m._meta.abstract)
        for m in all_models_with_cache:
            self.assertNotIn('_relation_tree', m._meta.__dict__) 

def setUp(self):
        from .test_app.models import TestModel
        from .test_app.elastic_indexes import TestSearchIndex
        from .test_app.viewsets import TestViewSet

        super().setUp()

        apps.clear_cache()
        call_command("migrate", verbosity=0, interactive=False)

        index_builder.indexes = [TestSearchIndex()]
        index_builder.register_signals()

        # Prepare users and groups
        user_model = get_user_model()
        self.user_1 = user_model.objects.create(username="user_one")
        self.user_2 = user_model.objects.create(username="user_two")
        group = Group.objects.create(name="group")
        group.user_set.add(self.user_2)

        tzone = get_current_timezone()
        # Prepare test data
        test_obj_1 = TestModel.objects.create(
            name="Object name 1",
            number=43,
            date=datetime.datetime(2018, 1, 1, 0, 0, tzinfo=tzone),
        )
        test_obj_2 = TestModel.objects.create(
            name="Object name 2",
            number=44,
            date=datetime.datetime(2017, 1, 1, 0, 0, tzinfo=tzone),
        )
        test_obj_3 = TestModel.objects.create(
            name="Object name 3",
            number=45,
            date=datetime.datetime(2016, 1, 1, 0, 0, tzinfo=tzone),
        )

        # Assing permissions
        assign_perm("view_testmodel", self.user_1, test_obj_1)
        assign_perm("view_testmodel", group, test_obj_2)
        assign_perm("view_testmodel", AnonymousUser(), test_obj_3)

        # Prepare test viewset
        self.test_viewset = TestViewSet.as_view(actions={"post": "list_with_post",})