def test_basic_send_recv(self):
        """
        Test basic send/recv methods between TCPFrameClient and a sample server
        socket.
        """

        # Create a listening server socket:
        s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
        # Reuse address:
        s.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
        s.bind(('',LOCAL_PORT))
        s.listen(5)

        # Connect FrameClient to server:
        tfc = TCPFrameClient(('127.0.0.1',LOCAL_PORT))

        # Accept connection on the server side:
        sock,addr = s.accept()

        # Send a frame from the TCPFrameClient to the server socket:
        frame = 'hello'
        tfc.send_frame(frame)
        # Read 4 bytes first:
        length = sock.recv(4)
        length_int = struct.unpack('I',length)[0]
        self.assertEquals(length_int,len(frame))
        # Receive the rest of the frame:
        r_frame = sock.recv(length_int)

        self.assertEquals(r_frame,frame)

        # Send a frame from the server socket to the TCPFrameClient:
        frame = 'How are you doing?'
        data = len_prefix_pack(frame)
        sock.send(data)
        r_frame = tfc.recv_frame()
        self.assertEquals(r_frame,frame)

        # Close server socket:
        sock.close()

        # We expect to get a None frame on the TCPFrameClient side:
        frame = tfc.recv_frame()
        self.assertEquals(frame,None)

        # Close listening socket:
        s.close()

        # Close TCPFrameClient:
        tfc.close()
    def test_len_prefix_pack(self):
        """
        Test len_prefix_{pack,unpack} functions.
        """
        # Simple packing and unpacking:
        msg = 'Example msg'
        data = len_prefix_pack(msg)
        self.assertEqual(len(data),len(msg) + 4)
        msg1,data1 = len_prefix_unpack(data)

        self.assertEqual(msg1,msg)
        self.assertEqual(len(data1),0)

        # Dealing with extra data:
        extra_data = 'some extra'
        longer_data = data + extra_data
        msg2,data2 = len_prefix_unpack(longer_data)
        self.assertEqual(msg2,msg)
        self.assertEqual(data2,extra_data)