Fixed #27626 -- Moved MEDIA_URL/STATIC_URL validation to a system check.

tests/check_framework/test_urls.py

@@ -1,14 +1,14 @@
 from django.conf import settings
 from django.core.checks.messages import Warning
 from django.core.checks.urls import (
-    check_url_config, check_url_namespaces_unique,
+    E006, check_url_config, check_url_namespaces_unique, check_url_settings,
     get_warning_for_invalid_pattern,
 )
 from django.test import SimpleTestCase
 from django.test.utils import override_settings
 
 
-class CheckUrlsTest(SimpleTestCase):
+class CheckUrlConfigTests(SimpleTestCase):
     @override_settings(ROOT_URLCONF='check_framework.urls.no_warnings')
     def test_no_warnings(self):
         result = check_url_config(None)
@@ -116,3 +116,28 @@ class CheckUrlsTest(SimpleTestCase):
     def test_check_unique_namespaces(self):
         result = check_url_namespaces_unique(None)
         self.assertEqual(result, [])
+
+
+class CheckURLSettingsTests(SimpleTestCase):
+
+    @override_settings(STATIC_URL='a/', MEDIA_URL='b/')
+    def test_slash_no_errors(self):
+        self.assertEqual(check_url_settings(None), [])
+
+    @override_settings(STATIC_URL='', MEDIA_URL='')
+    def test_empty_string_no_errors(self):
+        self.assertEqual(check_url_settings(None), [])
+
+    @override_settings(STATIC_URL='noslash')
+    def test_static_url_no_slash(self):
+        self.assertEqual(check_url_settings(None), [E006('STATIC_URL')])
+
+    @override_settings(STATIC_URL='slashes//')
+    def test_static_url_double_slash_allowed(self):
+        # The check allows for a double slash, presuming the user knows what
+        # they are doing.
+        self.assertEqual(check_url_settings(None), [])
+
+    @override_settings(MEDIA_URL='noslash')
+    def test_media_url_no_slash(self):
+        self.assertEqual(check_url_settings(None), [E006('MEDIA_URL')])