--- a/tests/test-bundle2.t	Tue Mar 18 18:40:31 2014 -0700
+++ b/tests/test-bundle2.t	Tue Mar 18 18:56:08 2014 -0700
@@ -162,3 +162,9 @@
   $ hg bundle2 --param '' --quiet
   abort: empty parameter name
   [255]
+
+bad parameter name
+
+  $ hg bundle2 --param 42babar
+  abort: non letter first character: '42babar'
+  [255]