--- a/tests/test-topic-change.t	Thu Oct 05 19:20:20 2017 +0530
+++ b/tests/test-topic-change.t	Thu Oct 05 19:30:22 2017 +0530
@@ -357,3 +357,51 @@
   o  8:86a186070af2 {}
      Added a  ()
   
+Changing topic on secret changesets
+-----------------------------------
+
+  $ hg up 26
+  switching to topic bar
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  (leaving bookmark bookboo)
+
+  $ hg phase -r . -s -f
+  $ hg phase -r .
+  26: secret
+
+  $ hg topic -r . watwat
+  switching to topic watwat
+  changed topic on 1 changes
+
+  $ hg glog
+  @  33:894983f69e69 {watwat}
+  |  Added g  ()
+  |
+  | o  32:1b83d11095b9 {movebook}
+  | |  Added h  (book bookboo)
+  | |
+  | x  26:7c76c271395f {bar}
+  |/   Added g  ()
+  |
+  o  25:7f26084dfaf1 {bar}
+  |  Added f  ()
+  |
+  o  24:b1f05e9ba0b5 {bar}
+  |  Added e  ()
+  |
+  o  23:f9869da2286e {foo}
+  |  Added d  ()
+  |
+  o  22:1b88140feefe {foobar}
+  |  Added c  ()
+  |
+  o  21:c39cabfcbbf7 {foobar}
+  |  Added b  ()
+  |
+  o  8:86a186070af2 {}
+     Added a  ()
+  
+XXX: the phase must be preserved and hence must be secret
+
+  $ hg phase -r .
+  33: draft