Added cleanup code to the proxy_model_inheritance tests. Refs #12286, #16329.

from django.conf import settings

from django.core.management import call_command

from django.db.models.loading import load_app

from django.db.models.loading import cache, load_app

from django.test import TransactionTestCase

from django.test.utils import override_settings

    def tearDown(self):

        sys.path = self.old_sys_path

        del cache.app_store[cache.app_labels['app1']]

        del cache.app_store[cache.app_labels['app2']]

        del cache.app_labels['app1']

        del cache.app_labels['app2']

        del cache.app_models['app1']

        del cache.app_models['app2']

    def test_table_exists(self):

        call_command('syncdb', verbosity=0)