// Copyright (c) 2012 Ecma International. All rights reserved. // This code is governed by the BSD license found in the LICENSE file. /*--- info: | Step 4 of defineProperty calls the [[DefineOwnProperty]] internal method of O to define the property. Step 7b of [[DefineOwnProperty]] rejects if current.[[Enumerable]] and desc.[[Enumerable]] are the boolean negations of each other. es5id: 15.2.3.6-4-10 description: > Object.defineProperty throws TypeError when changing [[Enumerable]] from false to true on non-configurable accessor properties ---*/ var o = {}; // create an accessor property; all other attributes default to false. // dummy getter var getter = function() { return 1; } var d1 = { get: getter, enumerable: false, configurable: false }; Object.defineProperty(o, "foo", d1); // now, setting enumerable to true should fail, since [[Configurable]] // on the original property will be false. var desc = { get: getter, enumerable: true }; assert.throws(TypeError, function() { Object.defineProperty(o, "foo", desc); }); // the property should remain unchanged. var d2 = Object.getOwnPropertyDescriptor(o, "foo"); assert.sameValue(d2.get, getter, 'd2.get'); assert.sameValue(d2.enumerable, false, 'd2.enumerable'); assert.sameValue(d2.configurable, false, 'd2.configurable'); reportCompare(0, 0);