--- a/tests/test-branches.t	Thu Aug 18 15:55:07 2016 +0900
+++ b/tests/test-branches.t	Thu Aug 18 16:29:22 2016 +0900
@@ -516,6 +516,8 @@
    }
   ]
 
+  $ hg branches --closed -T '{if(closed, "{branch}\n")}'
+  c
 
 Tests of revision branch name caching