js/src/tests/test262/ch11/11.13/11.13.2/11.13.2-27-s.js


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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.
/**
 * @path ch11/11.13/11.13.2/11.13.2-27-s.js
 * @description Strict Mode - TypeError is thrown if The LeftHandSide of a Compound Assignment operator(-=) is a reference to a data property with the attribute value {[[Writable]]:false}
 * @onlyStrict
 */


function testcase() {
        "use strict";
        var obj = {};
        Object.defineProperty(obj, "prop", {
            value: 10,
            writable: false,
            enumerable: true,
            configurable: true
        });

        try {
            obj.prop -= 20;
            return false;
        } catch (e) {
            return e instanceof TypeError && obj.prop === 10;
        }
    }
runTestCase(testcase);