def test_tuple(self):
        """
        Tuple elements are displayed on separate lines.
        """
        s = ('a', 'b')
        m = text.stringyString(s)
        self.assertEqual(m, '(a,\n b,)\n')

        Tuple elements are displayed on separate lines.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_text.py