--- a/tests/test-show.t	Fri Apr 07 10:26:13 2017 -0700
+++ b/tests/test-show.t	Fri Apr 07 10:46:32 2017 -0700
@@ -114,4 +114,12 @@
    }
   ]
 
+JSON works with no bookmarks
+
+  $ hg book -d a-longer-bookmark
+  $ hg book -d book1
+  $ hg show bookmarks -T json
+  [
+  ]
+
   $ cd ..