public function testHandlerLoaderWithInvalidHandlers()
{
$dummyClosure = function () {
// Empty function
};
$options = array('handlers' => array('test_handler_1', 'test_handler_2'));
$formatters = array();
$processors = array();
$handlers = array('test_handler_1' => $dummyClosure, 'test_handlerXYZ' => $dummyClosure);
$loader = new HandlerLoader($options, $formatters, $processors, $handlers);
}