Javascript Reflection over many JS files

I'm trying to set up a testing library or rather improve on jsUnit - In Javascript the way I've always understood it and used it, you should be able to access any and all objects included via the window object

For example, in Test.js, I have 2 closures but they're labeled:

var objEntityTest = (function()
{
    var objEntity = new Entity();

    objEntity.addObserver(
    {   update:     function()
                    {
                        alert("Entity Test");
                    }
    });

    objEntity.setId(1);
})();

var objItemTest = (function()
{
    var objItem = new Item();

    objItem.addObserver(
    {
        update:     function()
                    {
                        alert("Item Test");
                    }
    });

    objItem.setValue(new ItemValue(5, 3));
})();

The Test.js is loaded in the index.js and given a specific parameter, I can spark a round of testing. Except for some reason it's not being loaded.

<script>
    $(document).ready(function()
    {
        alert(window.length);

        for(obj in window)
            {
            var sName = getVariableName(obj);

            if(sName.contains("Test"))
                alert(sName);
    });
</script>

Now note these are 2 different files. Except window.length returns 0 and the for loop used to return a seemingly infinite alert of 'objTest' but then I changed it to obj and then it never popped up so I added the alert for window.length.

A theory I have is that in Javascript, every file has its own "window" object - If that's true then I'll need to just go back to jsUnit and give it the tests to process.