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/// 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.
/**
* Step 4 of defineProperty calls the [[DefineOwnProperty]] internal method
* of O to define the property. For non-configurable properties, step 10.a.ii.1
* of [[DefineOwnProperty]] rejects changing the value of non-writable properties.
*
* @path ch15/15.2/15.2.3/15.2.3.6/15.2.3.6-4-17.js
* @description Object.defineProperty throws TypeError when changing value of non-writable non-configurable data properties
*/
function testcase() {
var o = {};
// create a data valued property; all other attributes default to false.
var d1 = { value: 101 };
Object.defineProperty(o, "foo", d1);
// now, trying to change the value of "foo" should fail, since both
// [[Configurable]] and [[Writable]] on the original property will be false.
var desc = { value: 102 };
try {
Object.defineProperty(o, "foo", desc);
}
catch (e) {
if (e instanceof TypeError) {
// the property should remain unchanged.
var d2 = Object.getOwnPropertyDescriptor(o, "foo");
if (d2.value === 101 &&
d2.writable === false &&
d2.enumerable === false &&
d2.configurable === false) {
return true;
}
}
}
}
runTestCase(testcase);
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