--- a/tests/test-evolve-obshistory.t	Fri Apr 27 16:19:45 2018 +0800
+++ b/tests/test-evolve-obshistory.t	Fri Apr 27 16:28:34 2018 +0800
@@ -29,6 +29,9 @@
   $ hg obslog -ap null
   @  000000000000 (-1)
   
+  $ hg obslog 'wdir()'
+  abort: working directory revision cannot be specified
+  [255]
 
 Test output on amended commit
 =============================