--- a/tests/test-clone.t	Tue Nov 19 23:19:57 2019 +0900
+++ b/tests/test-clone.t	Wed Dec 18 20:17:21 2019 +0100
@@ -614,6 +614,12 @@
   abort: repository a not found!
   [255]
 
+Invalid URL
+
+  $ hg clone http://invalid:url/a b
+  abort: error: nonnumeric port: 'url'
+  [255]
+
 No remote source
 
 #if windows