Refs #26601 -- Added various middlewares tests for deprecation of passing None as get_response.

tests/deprecation/test_middleware_mixin.py

@@ -2,14 +2,29 @@ import threading
 
 from asgiref.sync import async_to_sync
 
+from django.contrib.admindocs.middleware import XViewMiddleware
+from django.contrib.auth.middleware import (
+    AuthenticationMiddleware, RemoteUserMiddleware,
+)
+from django.contrib.flatpages.middleware import FlatpageFallbackMiddleware
+from django.contrib.messages.middleware import MessageMiddleware
+from django.contrib.redirects.middleware import RedirectFallbackMiddleware
 from django.contrib.sessions.middleware import SessionMiddleware
+from django.contrib.sites.middleware import CurrentSiteMiddleware
 from django.db import connection
 from django.http.request import HttpRequest
 from django.http.response import HttpResponse
 from django.middleware.cache import (
     CacheMiddleware, FetchFromCacheMiddleware, UpdateCacheMiddleware,
 )
-from django.middleware.common import CommonMiddleware
+from django.middleware.clickjacking import XFrameOptionsMiddleware
+from django.middleware.common import (
+    BrokenLinkEmailsMiddleware, CommonMiddleware,
+)
+from django.middleware.csrf import CsrfViewMiddleware
+from django.middleware.gzip import GZipMiddleware
+from django.middleware.http import ConditionalGetMiddleware
+from django.middleware.locale import LocaleMiddleware
 from django.middleware.security import SecurityMiddleware
 from django.test import SimpleTestCase
 from django.utils.deprecation import MiddlewareMixin, RemovedInDjango40Warning
@@ -20,31 +35,40 @@ class MiddlewareMixinTests(SimpleTestCase):
     Deprecation warning is raised when using get_response=None.
     """
     msg = 'Passing None for the middleware get_response argument is deprecated.'
+    middlewares = [
+        AuthenticationMiddleware,
+        BrokenLinkEmailsMiddleware,
+        CacheMiddleware,
+        CommonMiddleware,
+        ConditionalGetMiddleware,
+        CsrfViewMiddleware,
+        CurrentSiteMiddleware,
+        FetchFromCacheMiddleware,
+        FlatpageFallbackMiddleware,
+        GZipMiddleware,
+        LocaleMiddleware,
+        MessageMiddleware,
+        RedirectFallbackMiddleware,
+        RemoteUserMiddleware,
+        SecurityMiddleware,
+        SessionMiddleware,
+        UpdateCacheMiddleware,
+        XFrameOptionsMiddleware,
+        XViewMiddleware,
+    ]
 
     def test_deprecation(self):
-        with self.assertRaisesMessage(RemovedInDjango40Warning, self.msg):
-            CommonMiddleware()
-
-    def test_passing_explicit_none(self):
-        with self.assertRaisesMessage(RemovedInDjango40Warning, self.msg):
-            CommonMiddleware(None)
-
-    def test_subclass_deprecation(self):
-        """
-        Deprecation warning is raised in subclasses overriding __init__()
-        without calling super().
-        """
-        for middleware in [
-            SessionMiddleware,
-            CacheMiddleware,
-            FetchFromCacheMiddleware,
-            UpdateCacheMiddleware,
-            SecurityMiddleware,
-        ]:
+        for middleware in self.middlewares:
             with self.subTest(middleware=middleware):
                 with self.assertRaisesMessage(RemovedInDjango40Warning, self.msg):
                     middleware()
 
+    def test_passing_explicit_none(self):
+        for middleware in self.middlewares:
+            with self.subTest(middleware=middleware):
+                with self.assertRaisesMessage(RemovedInDjango40Warning, self.msg):
+                    middleware(None)
+
     def test_sync_to_async_uses_base_thread_and_connection(self):
         """
         The process_request() and process_response() hooks must be called with

tests/runtests.py

@@ -90,8 +90,9 @@ ALWAYS_MIDDLEWARE = [
 # avoid "RuntimeError: Model class X doesn't declare an explicit app_label
 # and isn't in an application in INSTALLED_APPS."
 CONTRIB_TESTS_TO_APPS = {
-    'flatpages_tests': 'django.contrib.flatpages',
-    'redirects_tests': 'django.contrib.redirects',
+    'deprecation': ['django.contrib.flatpages', 'django.contrib.redirects'],
+    'flatpages_tests': ['django.contrib.flatpages'],
+    'redirects_tests': ['django.contrib.redirects'],
 }
 
 
@@ -228,7 +229,9 @@ def setup(verbosity, test_labels, parallel, start_at, start_after):
         )
 
         if module_name in CONTRIB_TESTS_TO_APPS and module_found_in_labels:
-            settings.INSTALLED_APPS.append(CONTRIB_TESTS_TO_APPS[module_name])
+            for contrib_app in CONTRIB_TESTS_TO_APPS[module_name]:
+                if contrib_app not in settings.INSTALLED_APPS:
+                    settings.INSTALLED_APPS.append(contrib_app)
 
         if module_found_in_labels and module_label not in installed_app_names:
             if verbosity >= 2: