--- a/tests/test-fold.t	Mon Jul 24 01:04:40 2017 +0200
+++ b/tests/test-fold.t	Mon Jul 24 02:06:14 2017 +0200
@@ -74,6 +74,7 @@
   $ hg phase --public 0
   $ hg fold --from -r 0
   abort: cannot fold public changesets
+  (see 'hg help phases' for details)
   [255]
 
 Test actual folding