diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/Array/length-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/Array/length-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,71 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ * Contributor:
+ *   Jeff Walden <jwalden+code@mit.edu>
+ */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 600392;
+var summary =
+  'Object.preventExtensions([]).length = 0 should do nothing, not throw';
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+
+function testEmpty()
+{
+  var a = [];
+  assertEq(a.length, 0);
+  assertEq(Object.preventExtensions(a), a);
+  assertEq(a.length, 0);
+  a.length = 0;
+  assertEq(a.length, 0);
+}
+testEmpty();
+
+function testEmptyStrict()
+{
+  "use strict";
+  var a = [];
+  assertEq(a.length, 0);
+  assertEq(Object.preventExtensions(a), a);
+  assertEq(a.length, 0);
+  a.length = 0;
+  assertEq(a.length, 0);
+}
+testEmptyStrict();
+
+function testNonEmpty()
+{
+  var a = [1, 2, 3];
+  assertEq(a.length, 3);
+  assertEq(Object.preventExtensions(a), a);
+  assertEq(a.length, 3);
+  a.length = 0;
+  assertEq(a.length, 0);
+}
+testNonEmpty();
+
+function testNonEmptyStrict()
+{
+  "use strict";
+  var a = [1, 2, 3];
+  assertEq(a.length, 3);
+  assertEq(Object.preventExtensions(a), a);
+  assertEq(a.length, 3);
+  a.length = 0;
+  assertEq(a.length, 0);
+}
+testNonEmptyStrict();
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("All tests passed!");