/// Copyright (c) 2012 Ecma International. All rights reserved. /// Ecma International makes this code available under the terms and conditions set /// forth on http://hg.ecmascript.org/tests/test262/raw-file/tip/LICENSE (the /// "Use Terms"). Any redistribution of this code must retain the above /// copyright and this notice and otherwise comply with the Use Terms. /** * Refer 11.1.5; * The production * PropertyNameAndValueList : PropertyAssignment * 3.Call the [[DefineOwnProperty]] internal method of obj with arguments propId.name, propId.descriptor, and false. * * @path ch11/11.1/11.1.5/11.1.5_3-3-1.js * @description Object initialization using PropertyNameAndValueList (PropertyAssignment) when property (read-only) exists in Object.prototype (step 3) */ function testcase() { try { Object.defineProperty(Object.prototype, "prop", { value: 100, writable: false, configurable: true }); var obj = { prop: 12 }; return obj.hasOwnProperty("prop") && obj.prop === 12; } finally { delete Object.prototype.prop; } } runTestCase(testcase);