Loading JForm field programatically

test.php

<?php
// No direct access
defined('_JEXEC') or die;

//Get custom field
JFormHelper::addFieldPath(JPATH_COMPONENT . '/models/fields');
$media_dummy = JFormHelper::loadFieldType('MediaUpload');
$element_init = simplexml_load_string('<field name="dummy" type="mediaupload" mediaType="image" required="true"
			accept="image/*" initCode="true" />');
$media_dummy->setup($element_init, '');

$media = JFormHelper::loadFieldType('MediaUpload');
$element = simplexml_load_string('<field name="image" type="mediaupload" mediaType="image" required="true"
			accept="image/*" />');
$media->setup($element, '');

echo $media_dummy;
echo $media;

This needs to be changed from
echo $media_dummy;
to
echo $media_dummy->getInput();

Also, getInput this needs to be public function in the field file.