--- a/tests/test-revset2.t	Mon Jun 11 19:24:01 2018 +0200
+++ b/tests/test-revset2.t	Mon Jun 11 11:37:21 2018 -0700
@@ -584,6 +584,9 @@
   hg: parse error: empty string is not a valid revision
   [255]
 
+test empty revset
+  $ hg log 'none()'
+
 we can use patterns when searching for tags
 
   $ log 'tag("1..*")'