def METHOD_NAME(self):
    self._make_tile({
        "title": "Foobar",
        "category": "media",
        "fields": [{
            "name": "foobar",
            "title": "Text",
            "required": False
        }]
    }, template='<div>Hello ${data/foobar}</div>')
    data = {
        'tile_id': 'foobartile',
        'foobar': 'Foobar!'
    }
    result = render_tile(self.request, self.portal,
                         'castle.cms.dynamic', data)
    self.assertIn('Hello Foobar!', result)