[1.8.x] Fixed #24153 -- Fixed cookie test compatibility with Python 3.4.3+

Backport of b19b81b396 from master

django/contrib/sessions/tests.py

@@ -24,6 +24,7 @@ from django.test.utils import patch_logger
 from django.utils import six
 from django.utils import timezone
 from django.utils.encoding import force_text
+from django.utils.six.moves import http_cookies
 
 from django.contrib.sessions.exceptions import InvalidSessionKey
 
@@ -543,7 +544,7 @@ class SessionMiddlewareTests(unittest.TestCase):
         response = middleware.process_response(request, response)
         self.assertTrue(
             response.cookies[settings.SESSION_COOKIE_NAME]['httponly'])
-        self.assertIn('httponly',
+        self.assertIn(http_cookies.Morsel._reserved['httponly'],
             str(response.cookies[settings.SESSION_COOKIE_NAME]))
 
     @override_settings(SESSION_COOKIE_HTTPONLY=False)
@@ -560,7 +561,7 @@ class SessionMiddlewareTests(unittest.TestCase):
         response = middleware.process_response(request, response)
         self.assertFalse(response.cookies[settings.SESSION_COOKIE_NAME]['httponly'])
 
-        self.assertNotIn('httponly',
+        self.assertNotIn(http_cookies.Morsel._reserved['httponly'],
                          str(response.cookies[settings.SESSION_COOKIE_NAME]))
 
     def test_session_save_on_500(self):

tests/requests/tests.py

@@ -16,6 +16,7 @@ from django.test.utils import str_prefix
 from django.utils import six
 from django.utils.encoding import force_str
 from django.utils.http import cookie_date, urlencode
+from django.utils.six.moves import http_cookies
 from django.utils.six.moves.urllib.parse import urlencode as original_urlencode
 from django.utils.timezone import utc
 
@@ -221,7 +222,7 @@ class RequestsTests(SimpleTestCase):
         example_cookie = response.cookies['example']
         # A compat cookie may be in use -- check that it has worked
         # both as an output string, and using the cookie attributes
-        self.assertIn('; httponly', str(example_cookie))
+        self.assertIn('; %s' % http_cookies.Morsel._reserved['httponly'], str(example_cookie))
         self.assertTrue(example_cookie['httponly'])
 
     def test_unicode_cookie(self):