LayoutTests/ietestcenter/Javascript/TestCases/15.4.4.14-9-b-5.js

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ES5Harness.registerTest({

    id: "15.4.4.14-9-b-5",

    path: "TestCases/chapter15/15.4/15.4.4/15.4.4.14/15.4.4.14-9-b-5.js",

    description: "Array.prototype.indexOf - Deleting own property with prototype property causes it to be visited",

    test: function testcase() {

        var arr = [0, 1, 2];
        Object.defineProperty(arr, "0", {
            get: function () {
                delete arr[1];
                return 0;
            },
            configurable: true
        });

        try {
            Array.prototype[1] = 1;
            return 1 === arr.indexOf(1);
        } finally {
            delete Array.prototype[1];
        }
    },

    precondition: function prereq() {
        return fnExists(Array.prototype.indexOf) && fnExists(Object.defineProperty);
    }

});