diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Set-surfaces-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Set-surfaces-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,29 @@
+// Set methods throw when passed a this-value that isn't a Set.
+
+load(libdir + "asserts.js");
+
+function testcase(obj, fn) {
+    assertEq(typeof fn, "function");
+    var args = Array.slice(arguments, 2);
+    assertThrowsInstanceOf(function () { fn.apply(obj, args); }, TypeError);
+}
+
+var Set_size_getter = Object.getOwnPropertyDescriptor(Set.prototype, "size").get;
+
+function test(obj) {
+    testcase(obj, Set.prototype.has, 12);
+    testcase(obj, Set.prototype.add, 12);
+    testcase(obj, Set.prototype.delete, 12);
+    testcase(obj, Set.prototype.clear);
+    testcase(obj, Set.prototype.keys);
+    testcase(obj, Set.prototype.values);
+    testcase(obj, Set.prototype.entries);
+    testcase(obj, Set_size_getter);
+}
+
+test(Set.prototype);
+test(Object.create(new Set));
+test(new Map());
+test({});
+test(null);
+test(undefined);