diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Set-surfaces-3.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Set-surfaces-3.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+// Set methods work when arguments are omitted.
+
+var s = new Set;
+assertEq(s.has(), false);
+assertEq(s.delete(), false);
+assertEq(s.has(), false);
+assertEq(s.add(), undefined);
+assertEq(s.has(), true);
+assertEq(s.delete(), true);
+assertEq(s.has(), false);