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diff --git a/js/src/tests/js1_5/extensions/regress-178722.js b/js/src/tests/js1_5/extensions/regress-178722.js
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+++ b/js/src/tests/js1_5/extensions/regress-178722.js
@@ -0,0 +1,93 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 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:    06 November 2002
+ * SUMMARY: arr.sort() should not output |undefined| when |arr| is empty
+ * See http://bugzilla.mozilla.org/show_bug.cgi?id=178722
+ *
+ * ECMA-262 Ed.3: 15.4.4.11 Array.prototype.sort (comparefn)
+ *
+ * 1. Call the [[Get]] method of this object with argument "length".
+ * 2. Call ToUint32(Result(1)).
+ * 3. Perform an implementation-dependent sequence of calls to the [[Get]],
+ *    [[Put]], and [[Delete]] methods of this object, etc. etc.
+ * 4. Return this object.
+ *
+ *
+ * Note that sort() is done in-place on |arr|. In other words, sort() is a
+ * "destructive" method rather than a "functional" method. The return value
+ * of |arr.sort()| and |arr| are the same object.
+ *
+ * If |arr| is an empty array, the return value of |arr.sort()| should be
+ * an empty array, not the value |undefined| as was occurring in bug 178722.
+ *
+ */
+//-----------------------------------------------------------------------------
+var UBound = 0;
+var BUGNUMBER = 178722;
+var summary = 'arr.sort() should not output |undefined| when |arr| is empty';
+var status = '';
+var statusitems = [];
+var actual = '';
+var actualvalues = [];
+var expect= '';
+var expectedvalues = [];
+var arr;
+
+
+// create empty array or pseudo-array objects in various ways
+function f () {return arguments};
+var arr5 = f();
+arr5.__proto__ = Array.prototype;
+
+
+status = inSection(5);
+arr = arr5.sort();
+actual = arr instanceof Array && arr.length === 0 && arr === arr5;
+expect = true;
+addThis();
+
+
+// now do the same thing, with non-default sorting:
+function g() {return 1;}
+
+status = inSection('5a');
+arr = arr5.sort(g);
+actual = arr instanceof Array && arr.length === 0 && arr === arr5;
+expect = true;
+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');
+}