def test_undefined(self):
        """
        It is undefined whether 2 > 0 or 0 > 2, and whether 1 > 3 or 3 > 1.
        """
        assertUndefinedComparison(self, serialNumber2(2), serialNumber2(0))
        assertUndefinedComparison(self, serialNumber2(0), serialNumber2(2))
        assertUndefinedComparison(self, serialNumber2(1), serialNumber2(3))
        assertUndefinedComparison(self, serialNumber2(3), serialNumber2(1))

        It is undefined whether 2 > 0 or 0 > 2, and whether 1 > 3 or 3 > 1.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/names/test/test_rfc1982.py