--- a/tests/test-topic-stack.t	Tue Mar 15 17:26:57 2016 +0000
+++ b/tests/test-topic-stack.t	Mon Mar 14 18:39:19 2016 +0000
@@ -69,12 +69,23 @@
   abort: no active topic to list
   [255]
 
+Test "t#" reference
+-------------------
+
+
+  $ hg up t1
+  abort: cannot resolve "t1": no active topic
+  [255]
+  $ hg topic foo
+  $ hg up t42
+  abort: cannot resolve "t42": topic "foo" has only 4 changesets
+  [255]
+  $ hg up t1
+  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
+
 Case with some of the topic unstable
 ------------------------------------
 
-  $ hg up 'desc(c_d)'
-  switching to topic foo
-  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
   $ echo bbb > ddd
   $ hg commit --amend
   $ hg log -G