--- a/tests/test-bookmarks.t	Wed Feb 16 04:36:36 2011 +0100
+++ b/tests/test-bookmarks.t	Wed Feb 16 18:36:45 2011 +0100
@@ -212,3 +212,10 @@
   $ hg bookmark ' '
   abort: bookmark names cannot consist entirely of whitespace
   [255]
+
+invalid bookmark
+
+  $ hg bookmark 'foo:bar'
+  abort: bookmark 'foo:bar' contains illegal character
+  [255]
+