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diff --git a/js/src/tests/non262/Array/length-truncate-nonconfigurable-sparse.js b/js/src/tests/non262/Array/length-truncate-nonconfigurable-sparse.js
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+++ b/js/src/tests/non262/Array/length-truncate-nonconfigurable-sparse.js
@@ -0,0 +1,110 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ * Contributor:
+ * Jeff Walden <jwalden+code@mit.edu>
+ */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 858381;
+var summary =
+ "Array length redefinition behavior with non-configurable elements";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+function addDataProperty(obj, prop, value, enumerable, configurable, writable)
+{
+ var desc =
+ { enumerable: enumerable,
+ configurable: configurable,
+ writable: writable,
+ value: value };
+ Object.defineProperty(obj, prop, desc);
+}
+
+function nonstrict()
+{
+ var arr = [0, , 2, , , 5];
+
+ addDataProperty(arr, 31415926, "foo", true, true, true);
+ addDataProperty(arr, 123456789, "bar", true, true, false);
+ addDataProperty(arr, 8675309, "qux", false, true, true);
+ addDataProperty(arr, 1735039, "eit", false, true, false);
+ addDataProperty(arr, 987654321, "fun", false, true, false);
+
+ // non-array indexes to spice things up
+ addDataProperty(arr, "foopy", "sdfsd", false, false, false);
+ addDataProperty(arr, 4294967296, "psych", true, false, false);
+ addDataProperty(arr, 4294967295, "psych", true, false, false);
+
+ addDataProperty(arr, 27182818, "eep", false, false, false);
+
+ // Truncate...but only as far as possible.
+ arr.length = 1;
+
+ assertEq(arr.length, 27182819);
+
+ var props = Object.getOwnPropertyNames(arr).sort();
+ var expected =
+ ["0", "2", "5", "1735039", "8675309", "27182818",
+ "foopy", "4294967296", "4294967295", "length"].sort();
+
+ assertEq(props.length, expected.length);
+ for (var i = 0; i < props.length; i++)
+ assertEq(props[i], expected[i], "unexpected property: " + props[i]);
+}
+nonstrict();
+
+function strict()
+{
+ "use strict";
+
+ var arr = [0, , 2, , , 5];
+
+ addDataProperty(arr, 31415926, "foo", true, true, true);
+ addDataProperty(arr, 123456789, "bar", true, true, false);
+ addDataProperty(arr, 8675309, "qux", false, true, true);
+ addDataProperty(arr, 1735039, "eit", false, true, false);
+ addDataProperty(arr, 987654321, "fun", false, true, false);
+
+ // non-array indexes to spice things up
+ addDataProperty(arr, "foopy", "sdfsd", false, false, false);
+ addDataProperty(arr, 4294967296, "psych", true, false, false);
+ addDataProperty(arr, 4294967295, "psych", true, false, false);
+
+ addDataProperty(arr, 27182818, "eep", false, false, false);
+
+ try
+ {
+ arr.length = 1;
+ throw new Error("didn't throw?!");
+ }
+ catch (e)
+ {
+ assertEq(e instanceof TypeError, true,
+ "non-configurable property should trigger TypeError, got " + e);
+ }
+
+ assertEq(arr.length, 27182819);
+
+ var props = Object.getOwnPropertyNames(arr).sort();
+ var expected =
+ ["0", "2", "5", "1735039", "8675309", "27182818",
+ "foopy", "4294967296", "4294967295", "length"].sort();
+
+ assertEq(props.length, expected.length);
+ for (var i = 0; i < props.length; i++)
+ assertEq(props[i], expected[i], "unexpected property: " + props[i]);
+}
+strict();
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+ reportCompare(true, true);
+
+print("Tests complete");