Stopped using django.utils.unittest in the test suite.

Refs #20680.

django/test/runner.py

@@ -1,12 +1,12 @@
 import os
 from optparse import make_option
+import unittest
+from unittest import TestSuite, defaultTestLoader
 
 from django.conf import settings
 from django.core.exceptions import ImproperlyConfigured
 from django.test import TestCase
 from django.test.utils import setup_test_environment, teardown_test_environment
-from django.utils import unittest
-from django.utils.unittest import TestSuite, defaultTestLoader
 
 
 class DiscoverRunner(object):

django/test/testcases.py

@@ -8,13 +8,16 @@ import json
 import os
 import re
 import sys
+import select
+import socket
+import threading
+import unittest
+from unittest import skipIf         # Imported here for backward compatibility
+from unittest.util import safe_repr
 try:
     from urllib.parse import urlsplit, urlunsplit
 except ImportError:     # Python 2
     from urlparse import urlsplit, urlunsplit
-import select
-import socket
-import threading
 
 from django.conf import settings
 from django.contrib.staticfiles.handlers import StaticFilesHandler
@@ -36,10 +39,8 @@ from django.test.html import HTMLParseError, parse_html
 from django.test.signals import template_rendered
 from django.test.utils import (CaptureQueriesContext, ContextList,
     override_settings, compare_xml)
-from django.utils import six, unittest as ut2
+from django.utils import six
 from django.utils.encoding import force_text
-from django.utils.unittest import skipIf # Imported here for backward compatibility
-from django.utils.unittest.util import safe_repr
 from django.views.static import serve
 
 
@@ -155,7 +156,7 @@ class _AssertTemplateNotUsedContext(_AssertTemplateUsedContext):
         return '%s was rendered.' % self.template_name
 
 
-class SimpleTestCase(ut2.TestCase):
+class SimpleTestCase(unittest.TestCase):
 
     # The class we'll use for the test client self.client.
     # Can be overridden in derived classes.
@@ -886,7 +887,7 @@ def _deferredSkip(condition, reason):
             @wraps(test_func)
             def skip_wrapper(*args, **kwargs):
                 if condition():
-                    raise ut2.SkipTest(reason)
+                    raise unittest.SkipTest(reason)
                 return test_func(*args, **kwargs)
             test_item = skip_wrapper
         else: