Dont let DarkLangConfig cache interfere with other tests

lms/djangoapps/branding/tests/test_views.py

@@ -5,7 +5,6 @@ import urllib
 
 import ddt
 import mock
-from config_models.models import cache
 from django.conf import settings
 from django.contrib.auth.models import User
 from django.urls import reverse
@@ -16,19 +15,15 @@ from openedx.core.djangoapps.dark_lang.models import DarkLangConfig
 from openedx.core.djangoapps.lang_pref.api import released_languages
 from openedx.core.djangoapps.site_configuration.tests.mixins import SiteMixin
 from openedx.core.djangoapps.theming.tests.test_util import with_comprehensive_theme_context
+from openedx.core.djangolib.testing.utils import CacheIsolationTestCase
 from student.tests.factories import UserFactory
 
 
 @ddt.ddt
-class TestFooter(TestCase):
+class TestFooter(CacheIsolationTestCase):
     """Test API end-point for retrieving the footer. """
     shard = 4
 
-    def setUp(self):
-        """Clear the configuration cache. """
-        super(TestFooter, self).setUp()
-        cache.clear()
-
     @ddt.data("*/*", "text/html", "application/json")
     def test_feature_flag(self, accepts):
         self._set_feature_flag(False)

lms/djangoapps/certificates/tests/test_webview_views.py

@@ -41,6 +41,7 @@ from openedx.core.djangoapps.certificates.config import waffle
 from openedx.core.djangoapps.dark_lang.models import DarkLangConfig
 from openedx.core.lib.tests.assertions.events import assert_event_matches
 from openedx.core.djangolib.js_utils import js_escaped_string
+from openedx.core.djangolib.testing.utils import CacheIsolationTestCase
 from student.roles import CourseStaffRole
 from student.tests.factories import CourseEnrollmentFactory, UserFactory
 from track.tests import EventTrackingTestCase
@@ -241,7 +242,7 @@ class CommonCertificatesTestCase(ModuleStoreTestCase):
 
 
 @ddt.ddt
-class CertificatesViewsTests(CommonCertificatesTestCase):
+class CertificatesViewsTests(CommonCertificatesTestCase, CacheIsolationTestCase):
     """
     Tests for the certificates web/html views
     """

lms/djangoapps/courseware/tests/test_i18n.py

@@ -14,11 +14,12 @@ from django.utils import translation
 
 from openedx.core.djangoapps.dark_lang.models import DarkLangConfig
 from openedx.core.djangoapps.lang_pref import LANGUAGE_KEY
+from openedx.core.djangolib.testing.utils import CacheIsolationTestCase
 from openedx.core.lib.tests import attr
 from student.tests.factories import UserFactory
 
 
-class BaseI18nTestCase(TestCase):
+class BaseI18nTestCase(CacheIsolationTestCase):
     """
     Base utilities for i18n test classes to derive from
     """