Add a TestCase mixin for enabling caches in tests

By default, disable all caching in tests, to preserve test independence.
In order to enable caching, inherit from CacheSetupMixin, and specify
which cache configuration is needed.

[EV-32]

openedx/core/djangoapps/programs/tests/test_utils.py

@@ -17,6 +17,7 @@ from openedx.core.djangoapps.programs import utils
 from openedx.core.djangoapps.programs.models import ProgramsApiConfig
 from openedx.core.djangoapps.programs.tests import factories
 from openedx.core.djangoapps.programs.tests.mixins import ProgramsApiConfigMixin, ProgramsDataMixin
+from openedx.core.djangolib.testing.utils import CacheIsolationTestCase
 from student.tests.factories import UserFactory, CourseEnrollmentFactory
 
 
@@ -26,8 +27,11 @@ UTILS_MODULE = 'openedx.core.djangoapps.programs.utils'
 @skipUnless(settings.ROOT_URLCONF == 'lms.urls', 'Test only valid in lms')
 @attr('shard_2')
 class TestProgramRetrieval(ProgramsApiConfigMixin, ProgramsDataMixin,
-                           CredentialsApiConfigMixin, TestCase):
+                           CredentialsApiConfigMixin, CacheIsolationTestCase):
     """Tests covering the retrieval of programs from the Programs service."""
+
+    ENABLED_CACHES = ['default']
+
     def setUp(self):
         super(TestProgramRetrieval, self).setUp()