diff --git a/tests/utils_tests/test_html.py b/tests/utils_tests/test_html.py
index 94b8f946cc..8057fdc051 100644
--- a/tests/utils_tests/test_html.py
+++ b/tests/utils_tests/test_html.py
@@ -183,6 +183,7 @@ class TestUtilsHtml(SimpleTestCase):
              'http://example.com/?q=http%3A%2F%2Fexample.com%2F%3Fx%3D1%26q%3Ddjango'),
             ('http://example.com/?q=http%3A%2F%2Fexample.com%2F%3Fx%3D1%26q%3Ddjango',
              'http://example.com/?q=http%3A%2F%2Fexample.com%2F%3Fx%3D1%26q%3Ddjango'),
+            ('http://.www.f oo.bar/', 'http://.www.f%20oo.bar/'),
         )
         # IDNs are properly quoted
         for value, output in items: