'L{TuntapPort.writeSequence} sends a datagram into the tunnel by
concatenating the byte strings in the list passed to it.'

def test_writeSequence(self):

    datagram = ['a', 'b', 'c', 'd']
    self.port.startListening()
    self.port.writeSequence(datagram)
    self.assertEqual(self.system.getTunnel(self.port).writeBuffer, deque([''.join(datagram)]))
