'L{send1msg} treats an empty ancillary data list the same way it treats
receiving no argument for the ancillary parameter at all.'

def test_roundtripEmptyAncillary(self):

    send1msg(self.input.fileno(), 'hello,    world!', 0, [])
    result = recv1msg(fd=self.output.fileno())
    self.assertEqual(result, ('hello,    world!', 0, []))
