--- a/tests/test-revset.t	Wed Jan 04 19:17:44 2017 -0800
+++ b/tests/test-revset.t	Sat May 23 11:04:11 2015 +0900
@@ -881,6 +881,13 @@
   $ log 'children(ancestor(4,5))'
   2
   3
+
+  $ log 'children(4)'
+  6
+  8
+  $ log 'children(null)'
+  0
+
   $ log 'closed()'
   $ log 'contains(a)'
   0