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diff --git a/js/src/tests/test262/built-ins/Object/defineProperties/15.2.3.7-6-a-120.js b/js/src/tests/test262/built-ins/Object/defineProperties/15.2.3.7-6-a-120.js
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+++ b/js/src/tests/test262/built-ins/Object/defineProperties/15.2.3.7-6-a-120.js
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+// Copyright (c) 2012 Ecma International. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.2.3.7-6-a-120
+description: >
+ Object.defineProperties - 'O' is an Array, 'P' is the length
+ property of 'O', the [[Value]] field of 'desc' is absent, test
+ updating the [[Writable]] attribute of the length property from
+ true to false (15.4.5.1 step 3.a.i)
+includes: [propertyHelper.js]
+---*/
+
+var arr = [];
+
+Object.defineProperties(arr, {
+ length: {
+ writable: false
+ }
+});
+
+verifyEqualTo(arr, "length", 0);
+
+verifyNotWritable(arr, "length");
+
+verifyNotEnumerable(arr, "length");
+
+verifyNotConfigurable(arr, "length");
+
+reportCompare(0, 0);