15.2.3.6-4-378.js (1028B)
1 // Copyright (c) 2012 Ecma International. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 4 /*--- 5 es5id: 15.2.3.6-4-378 6 description: > 7 ES5 Attributes - fail to update [[Writable]] attribute of data 8 property ([[Writable]] is false, [[Enumerable]] is false, 9 [[Configurable]] is false) to different value 10 ---*/ 11 12 var obj = {}; 13 14 Object.defineProperty(obj, "prop", { 15 value: 2010, 16 writable: false, 17 enumerable: false, 18 configurable: false 19 }); 20 var propertyDefineCorrect = obj.hasOwnProperty("prop"); 21 var desc1 = Object.getOwnPropertyDescriptor(obj, "prop"); 22 assert.throws(TypeError, function() { 23 Object.defineProperty(obj, "prop", { 24 writable: true 25 }); 26 }); 27 var desc2 = Object.getOwnPropertyDescriptor(obj, "prop"); 28 29 assert(propertyDefineCorrect, 'propertyDefineCorrect !== true'); 30 assert.sameValue(desc1.writable, false, 'desc1.writable'); 31 assert.sameValue(obj.prop, 2010, 'obj.prop'); 32 assert.sameValue(desc2.writable, false, 'desc2.writable'); 33 34 reportCompare(0, 0);