Add test for redirects without trailing slash being redirected in one go

wagtail/contrib/redirects/tests/test_redirects.py

@@ -200,6 +200,21 @@ def test_temporary_redirect(self):
             response, "/redirectto", status_code=302, fetch_redirect_response=False
         )
 
+    def test_redirect_without_trailing_slash(self):
+        # Create a redirect
+        redirect = models.Redirect(old_path="/redirectme", redirect_link="/redirectto")
+        redirect.save()
+
+        response = self.client.get("/redirectme")
+        # Request should be picked up by RedirectMiddleware, not CommonMiddleware
+        # (which would redirect to /redirectme/ instead).
+        # Before Django 4.2, CommonMiddleware performed the 'add trailing slash' test
+        # during the initial request processing, which took precedence over RedirectMiddleware
+        # and caused a double redirect (/redirectme -> /redirectme/ -> /redirectto).
+        self.assertRedirects(
+            response, "/redirectto", status_code=301, fetch_redirect_response=False
+        )
+
     def test_redirect_stripping_query_string(self):
         # Create a redirect which includes a query string
         redirect_with_query_string = models.Redirect(