LayoutTests/js/script-tests/array-sort-sparse.js

description(
"This tests that arrays and array like objects containing holes are sorted correctly."
);

function testSort(x)
{
    [].sort.call(x)
    return x[0] < x[1] && x[2] === undefined && !(3 in x) && x.length == 4;
}

shouldBeTrue("testSort([,undefined,0,1])");
shouldBeTrue("testSort({length:4,1:undefined,2:0,3:1})");