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

def test_roundtripEmptyAncillary(self):

    sendmsg(self.input, 'hello,    world!', [], 0)
    result = recvmsg(self.output)
    self.assertEqual(result, ('hello,    world!', [], 0))
