mirror of https://github.com/tc39/test262.git
38 lines
1.2 KiB
JavaScript
38 lines
1.2 KiB
JavaScript
// 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. For non-configurable properties, step 10.a.i
|
|
of [[DefineOwnProperty]] rejects if relaxing the [[Writable]] attribute.
|
|
es5id: 15.2.3.6-4-16
|
|
description: >
|
|
Object.defineProperty throws TypeError when relaxing [[Writable]]
|
|
on non-configurable data properties
|
|
---*/
|
|
|
|
var o = {};
|
|
|
|
// create a data valued property; all other attributes default to false.
|
|
var d1 = {
|
|
value: 101
|
|
};
|
|
Object.defineProperty(o, "foo", d1);
|
|
|
|
// now, relaxing [[Writable]] on "foo" should fail, since both
|
|
// [[Configurable]] and [[Writable]] on the original property will be false.
|
|
var desc = {
|
|
value: 101,
|
|
writable: true
|
|
};
|
|
assert.throws(TypeError, function() {
|
|
Object.defineProperty(o, "foo", desc);
|
|
});
|
|
// the property should remain unchanged.
|
|
var d2 = Object.getOwnPropertyDescriptor(o, "foo");
|
|
assert.sameValue(d2.value, 101, 'd2.value');
|
|
assert.sameValue(d2.writable, false, 'd2.writable');
|
|
assert.sameValue(d2.enumerable, false, 'd2.enumerable');
|
|
assert.sameValue(d2.configurable, false, 'd2.configurable');
|