Refs #26601 -- Deprecated passing None as get_response arg to middleware classes.

This is the new contract since middleware refactoring in Django 1.10.

Co-authored-by: Carlton Gibson <carlton.gibson@noumenal.es>
Co-authored-by: Mariusz Felisiak <felisiak.mariusz@gmail.com>

tests/auth_tests/test_middleware.py

@@ -1,20 +1,20 @@
 from django.contrib.auth.middleware import AuthenticationMiddleware
 from django.contrib.auth.models import User
-from django.http import HttpRequest
+from django.http import HttpRequest, HttpResponse
 from django.test import TestCase
 
 
 class TestAuthenticationMiddleware(TestCase):
     def setUp(self):
         self.user = User.objects.create_user('test_user', 'test@example.com', 'test_password')
-        self.middleware = AuthenticationMiddleware()
+        self.middleware = AuthenticationMiddleware(lambda req: HttpResponse())
         self.client.force_login(self.user)
         self.request = HttpRequest()
         self.request.session = self.client.session
 
     def test_no_password_change_doesnt_invalidate_session(self):
         self.request.session = self.client.session
-        self.middleware.process_request(self.request)
+        self.middleware(self.request)
         self.assertIsNotNone(self.request.user)
         self.assertFalse(self.request.user.is_anonymous)
 
@@ -22,7 +22,7 @@ class TestAuthenticationMiddleware(TestCase):
         # After password change, user should be anonymous
         self.user.set_password('new_password')
         self.user.save()
-        self.middleware.process_request(self.request)
+        self.middleware(self.request)
         self.assertIsNotNone(self.request.user)
         self.assertTrue(self.request.user.is_anonymous)
         # session should be flushed