diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/Array/sort-array-with-holes-and-undefined.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/Array/sort-array-with-holes-and-undefined.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,32 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 664528;
+var summary =
+  "Sorting an array containing only holes and |undefined| should move all " +
+  "|undefined| to the start of the array";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+var a = [, , , undefined];
+a.sort();
+
+assertEq(a.hasOwnProperty(0), true);
+assertEq(a[0], undefined);
+assertEq(a.hasOwnProperty(1), false);
+assertEq(a.hasOwnProperty(2), false);
+assertEq(a.hasOwnProperty(3), false);
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");