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.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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info: |
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Step 4 of defineProperty calls the [[DefineOwnProperty]] internal method
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of O to define the property. For non-configurable properties, step 10.a.ii.1
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of [[DefineOwnProperty]] rejects changing the value of non-writable properties.
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es5id: 15.2.3.6-4-17
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description: >
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Object.defineProperty throws TypeError when changing value of
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non-writable non-configurable data properties
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---*/
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var o = {};
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// create a data valued property; all other attributes default to false.
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var d1 = {
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value: 101
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};
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Object.defineProperty(o, "foo", d1);
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// now, trying to change the value of "foo" should fail, since both
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// [[Configurable]] and [[Writable]] on the original property will be false.
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var desc = {
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value: 102
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};
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assert.throws(TypeError, function() {
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Object.defineProperty(o, "foo", desc);
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});
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// the property should remain unchanged.
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var d2 = Object.getOwnPropertyDescriptor(o, "foo");
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assert.sameValue(d2.value, 101, 'd2.value');
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assert.sameValue(d2.writable, false, 'd2.writable');
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assert.sameValue(d2.enumerable, false, 'd2.enumerable');
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assert.sameValue(d2.configurable, false, 'd2.configurable');
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