diff --git a/tests/test_url.py b/tests/test_url.py
index 104b730b3..eafcccd9c 100644
--- a/tests/test_url.py
+++ b/tests/test_url.py
@@ -257,6 +257,7 @@ def test_host_subcomponent(host: str):
 @pytest.mark.parametrize(
     ("input", "result"),
     [
+        ("/", None),
         ("http://example.com", "example.com"),
         ("http://[::1]", "[::1]"),
         ("http://xn--gnter-4ya.com", "xn--gnter-4ya.com"),