--- a/tests/test-topic.t	Fri Sep 15 22:48:55 2017 +0530
+++ b/tests/test-topic.t	Fri Sep 15 23:13:05 2017 +0530
@@ -143,6 +143,7 @@
   $ hg stack
   ### topic: narf
   ### branch: default
+  (stack is empty)
 
 Add commits to topic