def testNoTrainingCFormat(self):
        tmpf = get_tmpfile('gensim_word2vec.tst')
        model = word2vec.Word2Vec(sentences, min_count=1)
        model.wv.save_word2vec_format(tmpf, binary=True)
        kv = keyedvectors.KeyedVectors.load_word2vec_format(tmpf, binary=True)
        binary_model = word2vec.Word2Vec()
        binary_model.wv = kv
        self.assertRaises(ValueError, binary_model.train, sentences)