--- a/tests/test-topic.t	Wed Jun 10 17:13:15 2015 -0500
+++ b/tests/test-topic.t	Wed Jun 10 17:40:50 2015 -0500
@@ -20,6 +20,15 @@
   (some details hidden, use --verbose to show complete help)
   $ hg topics
 
+Test topics interaction with evolution:
+
+  $ hg topics --config experimental.evolution=
+  $ hg topics --config experimental.evolution= --change . bob
+  abort: must have obsolete enabled to use --change
+  [255]
+
+Create some changes:
+
   $ for x in alpha beta gamma delta ; do
   >   echo file $x >> $x
   >   hg addremove