def test_unknownTypeRepr(self):
        """
        Test the repr of an empty sentence of unknown type.
        """
        sentence = self.sentenceClass({})
        expectedRepr = self._expectedRepr()
        self.assertEqual(repr(sentence), expectedRepr)

        Test the repr of an empty sentence of unknown type.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/positioning/test/test_sentence.py