def test_Y2106Problem(self):
        """
        L{SerialNumber} wraps unix timestamps in the year 2106.
        """
        self.assertEqual(
            SerialNumber(-1).toRFC4034DateString(),
            '21060207062815'
        )

        L{SerialNumber} wraps unix timestamps in the year 2106.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/names/test/test_rfc1982.py