def test_xml_ratings_empty(self):
        ratings = dict()
        xmldata = self.api._xml_ratings(ratings)
        self.assertEqual(
            xmldata,
            '<?xml version="1.0" encoding="UTF-8"?>'
            '<metadata xmlns="http://musicbrainz.org/ns/mmd-2.0#">'
            '<recording-list></recording-list>'
            '</metadata>'
        )