diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_3/Number/15.7.4.7-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_3/Number/15.7.4.7-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,39 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = "411893";
+var summary = "num.toPrecision(undefined) should equal num.toString()";
+var actual, expect;
+
+printBugNumber(BUGNUMBER);
+printStatus(summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+var failed = false;
+
+try
+{
+  var prec = 3.3.toPrecision(undefined);
+  var str  = 3.3.toString();
+  if (prec !== str)
+  {
+    throw "not equal!  " +
+          "3.3.toPrecision(undefined) === '" + prec + "', " +
+          "3.3.toString() === '" + str + "'";
+  }
+}
+catch (e)
+{
+  failed = e;
+}
+
+expect = false;
+actual = failed;
+
+reportCompare(expect, actual, summary);