diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_3/Expressions/11.9.6-1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_3/Expressions/11.9.6-1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,179 @@
+/* -*- 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/. */
+
+/*
+ *
+ * Date:    20 Feb 2002
+ * SUMMARY: Testing the comparison |undefined === null|
+ * See http://bugzilla.mozilla.org/show_bug.cgi?id=126722
+ *
+ */
+//-----------------------------------------------------------------------------
+var UBound = 0;
+var BUGNUMBER = 126722;
+var summary = 'Testing the comparison |undefined === null|';
+var status = '';
+var statusitems = [];
+var actual = '';
+var actualvalues = [];
+var expect= '';
+var expectedvalues = [];
+
+
+status = inSection(1);
+if (undefined === null)
+  actual = true;
+else
+  actual = false;
+expect = false;
+addThis();
+
+
+
+status = inSection(2);
+switch(true)
+{
+case (undefined === null) :
+  actual = true;
+  break;
+
+default:
+  actual = false;
+}
+expect = false;
+addThis();
+
+
+
+status = inSection(3);
+function f3(x)
+{
+  var res = false;
+
+  switch(true)
+  {
+  case (x === null) :
+    res = true;
+    break;
+
+  default:
+    // do nothing
+  }
+
+  return res;
+}
+
+actual = f3(undefined);
+expect = false;
+addThis();
+
+
+
+status = inSection(4);
+function f4(arr)
+{
+  var elt = '';
+  var res = false;
+
+  for (i=0; i<arr.length; i++)
+  {
+    elt = arr[i];
+
+    switch(true)
+    {
+    case (elt === null) :
+      res = true;
+      break;
+
+    default:
+      // do nothing
+    }
+  }
+
+  return res;
+}
+
+var arr = Array('a', undefined);
+actual = f4(arr);
+expect = false;
+addThis();
+
+
+
+status = inSection(5);
+function f5(arr)
+{
+  var len = arr.length;
+
+  for(var i=0; (arr[i]===undefined) && (i<len); i++)
+    ; //do nothing
+ 
+  return i;
+}
+
+/*
+ * An array of 5 undefined elements. Note:
+ *
+ * The return value of eval(a STATEMENT) is undefined.
+ * A non-existent PROPERTY is undefined, not a ReferenceError.
+ * No undefined element exists AFTER trailing comma at end.
+ *
+ */
+var arrUndef = [ , undefined, eval('var x = 0'), this.NOT_A_PROPERTY, , ];
+actual = f5(arrUndef);
+expect = 5;
+addThis();
+
+
+
+status = inSection(6);
+function f6(arr)
+{
+  var len = arr.length;
+
+  for(var i=0; (arr[i]===null) && (i<len); i++)
+    ; //do nothing
+
+  return i;
+}
+
+/*
+ * Use same array as above. This time we're comparing to |null|, so we expect 0
+ */
+actual = f6(arrUndef);
+expect = 0;
+addThis();
+
+
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+
+
+function addThis()
+{
+  statusitems[UBound] = status;
+  actualvalues[UBound] = actual;
+  expectedvalues[UBound] = expect;
+  UBound++;
+}
+
+
+function test()
+{
+  enterFunc('test');
+  printBugNumber(BUGNUMBER);
+  printStatus(summary);
+
+  for (var i=0; i<UBound; i++)
+  {
+    reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
+  }
+
+  exitFunc ('test');
+}