--- a/tests/test-topic.t	Sun Jun 25 06:47:59 2017 +0530
+++ b/tests/test-topic.t	Mon Jun 26 17:47:04 2017 +0200
@@ -577,9 +577,35 @@
   rebasing 10:4073470c35e1 "fran?"
 
 Can add a topic to an existing change
+  $ hg topic
+  $ hg sum
+  parent: 12:18b70b8de1f0 tip
+   fran?
+  branch: default
+  commit: (clean)
+  update: 5 new changesets, 2 branch heads (merge)
+  phases: 2 draft
   $ hg topic --rev 11 wat
   changed topic on 1 changes
   please run hg evolve --rev "topic(wat)" now
+  $ hg log -r .
+  changeset:   12:18b70b8de1f0
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  trouble:     unstable
+  summary:     fran?
+  
+  $ hg sum
+  parent: 12:18b70b8de1f0  (unstable)
+   fran?
+  branch: default
+  commit: (clean)
+  update: 5 new changesets, 2 branch heads (merge)
+  phases: 3 draft
+  unstable: 1 changesets
+  topic:  wat
+  $ hg topic
+   * wat
   $ hg log -Gr 'draft() and not obsolete()'
   o  changeset:   13:686a642006db
   |  tag:         tip