src/third_party/mozjs-45/js/src/jit-test/tests/basic/testInvalidCharCodeAt.js

function doTestInvalidCharCodeAt(input)
{
    var q = "";
    for (var i = 0; i < 10; i++)
       q += input.charCodeAt(i);
    return q;
}
function testInvalidCharCodeAt()
{
    return doTestInvalidCharCodeAt("");
}
assertEq(testInvalidCharCodeAt(), "NaNNaNNaNNaNNaNNaNNaNNaNNaNNaN");