LayoutTests/ietestcenter/Javascript/TestCases/15.4.4.15-8-a-6.js

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ES5Harness.registerTest({

    id: "15.4.4.15-8-a-6",

    path: "TestCases/chapter15/15.4/15.4.4/15.4.4.15/15.4.4.15-8-a-6.js",

    description: "Array.prototype.lastIndexOf - test that deleted properties of step 5 are visible here on an Array",

    test: function testcase() {

        var arr = [];
        arr[10] = "10";
        arr.length = 20;

        var fromIndex = {
            valueOf: function () {
                delete arr[10];
                return 11;
            }
        };

        return -1 === arr.lastIndexOf("10", fromIndex);
    },

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

});