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]

lms/djangoapps/courseware/tests/test_course_info.py

@@ -36,6 +36,7 @@ class CourseInfoTestCase(LoginEnrollmentTestCase, SharedModuleStoreTestCase):
     """
     Tests for the Course Info page
     """
+
     @classmethod
     def setUpClass(cls):
         super(CourseInfoTestCase, cls).setUpClass()
@@ -263,6 +264,7 @@ class SelfPacedCourseInfoTestCase(LoginEnrollmentTestCase, SharedModuleStoreTest
     """
     Tests for the info page of self-paced courses.
     """
+    ENABLED_CACHES = ['default', 'mongo_metadata_inheritance', 'loc_cache']
 
     @classmethod
     def setUpClass(cls):

lms/djangoapps/courseware/tests/test_grades.py

@@ -151,6 +151,8 @@ class TestMaxScoresCache(SharedModuleStoreTestCase):
     Tests for the MaxScoresCache
     """
 
+    ENABLED_CACHES = ['default', 'mongo_metadata_inheritance', 'loc_cache']
+
     @classmethod
     def setUpClass(cls):
         super(TestMaxScoresCache, cls).setUpClass()

lms/djangoapps/courseware/tests/test_submitting_problems.py

@@ -127,6 +127,8 @@ class TestSubmittingProblems(ModuleStoreTestCase, LoginEnrollmentTestCase, Probl
     COURSE_SLUG = "100"
     COURSE_NAME = "test_course"
 
+    ENABLED_CACHES = ['default', 'mongo_metadata_inheritance', 'loc_cache']
+
     def setUp(self):
         super(TestSubmittingProblems, self).setUp()
 

lms/djangoapps/courseware/tests/test_views.py

@@ -970,6 +970,8 @@ class ProgressPageTests(ModuleStoreTestCase):
     Tests that verify that the progress page works correctly.
     """
 
+    ENABLED_CACHES = ['default', 'mongo_modulestore_inheritance', 'loc_cache']
+
     def setUp(self):
         super(ProgressPageTests, self).setUp()
         self.request_factory = RequestFactory()