add tests for async common middleware

Author: amirreza8002

tests/test_middlewares/extra_urls.py

@@ -0,0 +1,9 @@
+from django.urls import path
+
+from . import views
+
+urlpatterns = [
+    path("customurlconf/noslash", views.empty_view),
+    path("customurlconf/slash/", views.empty_view),
+    path("customurlconf/needsquoting#/", views.empty_view),
+]