Clean up TestCase subclassing

cms/djangoapps/contentstore/management/commands/tests/test_create_course.py

 """
 Unittests for creating a course in an chosen modulestore
 """
-import unittest
 import ddt
 from django.core.management import CommandError, call_command
+from django.test import TestCase
 
 from contentstore.management.commands.create_course import Command
 from xmodule.modulestore import ModuleStoreEnum
@@ -11,7 +11,7 @@ from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
 from xmodule.modulestore.django import modulestore
 
 
-class TestArgParsing(unittest.TestCase):
+class TestArgParsing(TestCase):
     """
     Tests for parsing arguments for the `create_course` management command
     """

cms/djangoapps/contentstore/management/commands/tests/test_migrate_to_split.py

 """
 Unittests for migrating a course to split mongo
 """
-import unittest
-
 from django.core.management import CommandError, call_command
+from django.test import TestCase
 from contentstore.management.commands.migrate_to_split import Command
 from xmodule.modulestore import ModuleStoreEnum
 from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
@@ -12,7 +11,7 @@ from xmodule.modulestore.django import modulestore
 from xmodule.modulestore.exceptions import ItemNotFoundError
 
 
-class TestArgParsing(unittest.TestCase):
+class TestArgParsing(TestCase):
     """
     Tests for parsing arguments for the `migrate_to_split` management command
     """

common/lib/xmodule/xmodule/modulestore/tests/test_mongo.py

@@ -78,7 +78,7 @@ class TestMongoModuleStoreBase(unittest.TestCase):
     courses = ['toy', 'simple', 'simple_with_draft', 'test_unicode']
 
     @classmethod
-    def setupClass(cls):
+    def setUpClass(cls):
         cls.connection = pymongo.MongoClient(
             host=HOST,
             port=PORT,
@@ -93,7 +93,7 @@ class TestMongoModuleStoreBase(unittest.TestCase):
         cls.content_store, cls.draft_store = cls.initdb()
 
     @classmethod
-    def teardownClass(cls):
+    def tearDownClass(cls):
         if cls.connection:
             cls.connection.drop_database(DB)
             cls.connection.close()
@@ -186,12 +186,12 @@ class TestMongoModuleStore(TestMongoModuleStoreBase):
         pass
 
     @classmethod
-    def setupClass(cls):
-        super(TestMongoModuleStore, cls).setupClass()
+    def setUpClass(cls):
+        super(TestMongoModuleStore, cls).setUpClass()
 
     @classmethod
-    def teardownClass(cls):
-        super(TestMongoModuleStore, cls).teardownClass()
+    def tearDownClass(cls):
+        super(TestMongoModuleStore, cls).tearDownClass()
 
     def test_init(self):
         '''Make sure the db loads'''
@@ -728,12 +728,12 @@ class TestMongoModuleStoreWithNoAssetCollection(TestMongoModuleStore):
         pass
 
     @classmethod
-    def setupClass(cls):
-        super(TestMongoModuleStoreWithNoAssetCollection, cls).setupClass()
+    def setUpClass(cls):
+        super(TestMongoModuleStoreWithNoAssetCollection, cls).setUpClass()
 
     @classmethod
-    def teardownClass(cls):
-        super(TestMongoModuleStoreWithNoAssetCollection, cls).teardownClass()
+    def tearDownClass(cls):
+        super(TestMongoModuleStoreWithNoAssetCollection, cls).tearDownClass()
 
     def test_no_asset_collection(self):
         courses = self.draft_store.get_courses()

openedx/core/djangoapps/content/block_structure/tests/test_factory.py

 """
 Tests for block_structure_factory.py
 """
+from django.test import TestCase
 from nose.plugins.attrib import attr
-from unittest import TestCase
 from xmodule.modulestore.exceptions import ItemNotFoundError
 
 from ..store import BlockStructureStore

openedx/core/djangoapps/content/block_structure/tests/test_manager.py

@@ -2,8 +2,8 @@
 Tests for manager.py
 """
 import ddt
+from django.test import TestCase
 from nose.plugins.attrib import attr
-from unittest import TestCase
 
 from ..block_structure import BlockStructureBlockData
 from ..config import RAISE_ERROR_WHEN_NOT_FOUND, STORAGE_BACKING_FOR_CACHE, waffle

openedx/core/djangoapps/user_api/tests/test_middleware.py

 """Tests for user API middleware"""
 from mock import Mock, patch
-from unittest import TestCase
 
 from django.http import HttpResponse
+from django.test import TestCase
 from django.test.client import RequestFactory
 
 from student.tests.factories import UserFactory, AnonymousUserFactory

openedx/core/djangoapps/user_api/tests/test_partition_schemes.py

@@ -2,8 +2,8 @@
 Test the user api's partition extensions.
 """
 from collections import defaultdict
+from django.test import TestCase
 from mock import patch
-from unittest import TestCase
 
 from openedx.core.djangoapps.user_api.partition_schemes import RandomUserPartitionScheme, UserPartitionError
 from student.tests.factories import UserFactory

openedx/core/djangoapps/util/tests/test_user_messages.py

@@ -3,10 +3,9 @@ Unit tests for user messages.
 """
 
 import ddt
-from unittest import TestCase
 
 from django.contrib.messages.middleware import MessageMiddleware
-from django.test import RequestFactory
+from django.test import RequestFactory, TestCase
 from openedx.core.djangolib.markup import HTML, Text
 from student.tests.factories import UserFactory