Fixed #27796 -- Prevented middleware being loaded twice with runserver

Thanks Tim Graham for the review.

1 files changed, 12 insertions, 1 deletions

diff --git a/tests/staticfiles_tests/test_management.py b/tests/staticfiles_tests/test_management.py
index 4a5963417e..54c271b793 100644
--- a/tests/staticfiles_tests/test_management.py
+++ b/tests/staticfiles_tests/test_management.py
@@ -11,7 +11,9 @@ from admin_scripts.tests import AdminScriptTestCase
 
 from django.conf import settings
 from django.contrib.staticfiles import storage
-from django.contrib.staticfiles.management.commands import collectstatic
+from django.contrib.staticfiles.management.commands import (
+    collectstatic, runserver,
+)
 from django.core.exceptions import ImproperlyConfigured
 from django.core.management import call_command
 from django.test import override_settings
@@ -34,6 +36,15 @@ class TestNoFilesCreated:
         self.assertEqual(os.listdir(settings.STATIC_ROOT), [])
 
 
+class TestRunserver(StaticFilesTestCase):
+    @override_settings(MIDDLEWARE=['django.middleware.common.CommonMiddleware'])
+    def test_middleware_loaded_only_once(self):
+        command = runserver.Command()
+        with mock.patch('django.middleware.common.CommonMiddleware') as mocked:
+            command.get_handler(use_static_handler=True, insecure_serving=True)
+            self.assertEqual(mocked.call_count, 1)
+
+
 class TestFindStatic(TestDefaults, CollectionTestCase):
     """
     Test ``findstatic`` management command.