--- a/tests/test-largefiles-misc.t	Fri Nov 21 15:50:38 2014 -0800
+++ b/tests/test-largefiles-misc.t	Sun Nov 30 23:30:31 2014 -0500
@@ -67,6 +67,11 @@
   dirc/baz/largefile
   dirc/dirb
   dirc/dirb/largefile
+
+  $ hg clone -q . ../fetch
+  $ hg --config extensions.fetch= fetch ../fetch
+  abort: uncommitted changes
+  [255]
   $ hg up -qC
   $ cd ..