'L{_ChunkedTransferDecoder.dataReceived} passes any bytes which come
after the terminating zero-length chunk to the completion callback.'

def test_extra(self):

    finished = []
    p = http._ChunkedTransferDecoder(None, finished.append)
    p.dataReceived('0\r\n\r\nhello')
    self.assertEqual(finished, ['hello'])
