LayoutTests/ietestcenter/Javascript/TestCases/15.4.4.15-8-b-iii-2.js

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ES5Harness.registerTest({

    id: "15.4.4.15-8-b-iii-2",

    path: "TestCases/chapter15/15.4/15.4.4/15.4.4.15/15.4.4.15-8-b-iii-2.js",

    description: "Array.prototype.lastIndexOf returns without visiting subsequent element once search value is found",

    test: function testcase() {
        var arr = [2, 1, , 1, 2];
        var elementFirstAccessed = false;
        var elementThirdAccessed = false;

        Object.defineProperty(arr, "2", {
            get: function () {
                elementThirdAccessed = true;
                return 2;
            },
            configurable: true
        });
        Object.defineProperty(arr, "0", {
            get: function () {
                elementFirstAccessed = true;
                return 2;
            },
            configurable: true
        });

        arr.lastIndexOf(2);
        return !elementThirdAccessed && !elementFirstAccessed;
    },

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

});