def METHOD_NAME(self):
    try:
        self.empty_vocab.id_to_char(0)
        raise Exception("Should have raised KeyError")
    except:
        pass
    for k in self.phonemes.vocab:
        v = self.phonemes.char_to_id(k)
        self.assertEqual(self.base_vocab.id_to_char(v), self.phonemes.id_to_char(v))