def test_trivial(self):
        """
        Using no formatting attributes produces no VT102 control sequences in
        the flattened output.
        """
        self.assertEqual(
            text.assembleFormattedText(A.normal['Hello, world.']),
            'Hello, world.')

        Using no formatting attributes produces no VT102 control sequences in
        the flattened output.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/conch/test/test_text.py