Cannot find Class with PHP Namespace

Question

I posted some questions previously regarding the use of Namespaces in PHP and from what I got, this example code I have below should be working.

However I am getting

Answer 1

try

registry = new Registry;
    }
    function show()
    {
        echo $this->registry;
        echo '
Registry was ran inside testcontroller.php
';
    }
}
?>

and