public function testAddCustomItemFieldWithRoutedItemInterface()
{
$feed = $this->manager->get('article');
$feed->add(new FakeRoutedItemInterfaceEntity());
$feed->addItemField(new ItemField('fake_custom', 'getFeedItemCustom'));
$output = $feed->render('rss');
$this->assertContains('<fake_custom>My custom field</fake_custom>', $output);
}