diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/Object/15.2.3.4-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/Object/15.2.3.4-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ * Contributor:
+ *   Jeff Walden <jwalden+code@mit.edu>
+ */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 518663;
+var summary =
+  'Object.getOwnPropertyNames should play nicely with enumerator caching';
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+for (var p in JSON);
+var names = Object.getOwnPropertyNames(JSON);
+assertEq(names.length >= 2, true,
+         "wrong number of property names?  [" + names + "]");
+assertEq(names.indexOf("parse") >= 0, true);
+assertEq(names.indexOf("stringify") >= 0, true);
+
+/******************************************************************************/
+
+reportCompare(true, true);
+
+print("All tests passed!");