LayoutTests/ietestcenter/Javascript/TestCases/15.4.4.15-8-a-11.js

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ES5Harness.registerTest({

    id: "15.4.4.15-8-a-11",

    path: "TestCases/chapter15/15.4/15.4.4/15.4.4.15/15.4.4.15-8-a-11.js",

    description: "Array.prototype.lastIndexOf - test that deleting own property causes it not to be visited on an Array-like object",

    test: function testcase() {

        var arr = { length: 200 };

        Object.defineProperty(arr, "1", {
            get: function () {
                return 6.99;
            },
            configurable: true
        });

        Object.defineProperty(arr, "100", {
            get: function () {
                delete arr[1];
                return 0;
            },
            configurable: true
        });

        return -1 === Array.prototype.lastIndexOf.call(arr, 6.99);
    },

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

});