  from django.contrib.redirects.models import Redirect
  from django.contrib.sites.models import Site
  from django.core.exceptions import ImproperlyConfigured
  from django.test import TestCase, modify_settings, override_settings
  from django.utils import six
  
  
  @modify_settings(MIDDLEWARE={'append': 'django.contrib.redirects.middleware.RedirectFallbackMiddleware'})
  @override_settings(APPEND_SLASH=False, SITE_ID=1)
  class RedirectTests(TestCase):
 
</s> remove from django.utils import six
 </s> add  </s> remove from django.utils import six
 </s> add  </s> remove from django.utils import six
 </s> add  </s> remove from django.utils import six
 </s> add  </s> remove from django.utils import six, timezone
 </s> add from django.utils import timezone
  from django.contrib.redirects.models import Redirect
  from django.contrib.sites.models import Site
  from django.core.exceptions import ImproperlyConfigured
  from django.test import TestCase, modify_settings, override_settings

  
  
  @modify_settings(MIDDLEWARE={'append': 'django.contrib.redirects.middleware.RedirectFallbackMiddleware'})
  @override_settings(APPEND_SLASH=False, SITE_ID=1)
  class RedirectTests(TestCase):
keep keep keep keep replace keep keep keep keep keep
 Refs #23919 -- Removed six.<various>_types usage

Thanks Tim Graham and Simon Charette for the reviews. 
tests/redirects_tests/tests.py