tests/test-dispatch.t

--- a/tests/test-dispatch.t	Fri Nov 10 22:27:26 2017 +0900
+++ b/tests/test-dispatch.t	Sat Nov 11 14:02:41 2017 +0900
@@ -51,6 +51,12 @@
   --debugger: no such file in rev cb9a9f314b8b
   [1]
 
+Unparsable form of early options:
+
+  $ hg cat --debugg
+  abort: option --debugger may not be abbreviated!
+  [255]
+
 [defaults]
 
   $ hg cat a