mirror of https://github.com/tc39/test262.git
49 lines
1.6 KiB
JavaScript
49 lines
1.6 KiB
JavaScript
// Copyright (c) 2012 Ecma International. All rights reserved.
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// Ecma International makes this code available under the terms and conditions set
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// forth on http://hg.ecmascript.org/tests/test262/raw-file/tip/LICENSE (the
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// "Use Terms"). Any redistribution of this code must retain the above
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// copyright and this notice and otherwise comply with the Use Terms.
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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. Step 7b of [[DefineOwnProperty]] rejects if
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current.[[Enumerable]] and desc.[[Enumerable]] are the boolean negations
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of each other.
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es5id: 15.2.3.6-4-9
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description: >
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Object.defineProperty throws TypeError when changing
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[[Enumerable]] from true to false on non-configurable data
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properties
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includes: [runTestCase.js]
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---*/
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function testcase() {
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var o = {};
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// create a data valued property with [[Enumerable]] explicitly set to true;
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// all other attributes default to false.
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var d1 = { value: 101, enumerable: true, configurable: false };
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Object.defineProperty(o, "foo", d1);
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// now, setting enumerable to false should fail, since [[Configurable]]
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// on the original property will be false.
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var desc = { value: 101, enumerable: false };
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try {
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Object.defineProperty(o, "foo", desc);
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}
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catch (e) {
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if (e instanceof TypeError) {
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// the property should remain unchanged.
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var d2 = Object.getOwnPropertyDescriptor(o, "foo");
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if (d2.value === 101 &&
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d2.enumerable === true &&
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d2.configurable === false) {
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return true;
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}
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}
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}
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}
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runTestCase(testcase);
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