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diff --git a/js/src/tests/test262/built-ins/Object/preventExtensions/15.2.3.10-3-19.js b/js/src/tests/test262/built-ins/Object/preventExtensions/15.2.3.10-3-19.js
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+++ b/js/src/tests/test262/built-ins/Object/preventExtensions/15.2.3.10-3-19.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: 15.2.3.10-3-19
+description: >
+ Object.preventExtensions - named properties cannot be added into a
+ RegExp object
+includes: [propertyHelper.js]
+---*/
+
+var obj = new RegExp();
+
+assert(Object.isExtensible(obj));
+Object.preventExtensions(obj);
+assert(!Object.isExtensible(obj));
+
+verifyNotWritable(obj, "exName", "nocheck");
+
+assert(!obj.hasOwnProperty("exName"));
+
+reportCompare(0, 0);