public void Serializes_Pdu()
        {
            var expectedResult = new byte[] {
                0x00, 0x00, 0x00, 0x10, // length
                0x80, 0x00, 0x00, 0x06, // command
                0x00, 0x00, 0x00, 0x00, // status
                0x00, 0x00, 0x00, 0x20, // sequence
            };
            var pdu = new UnbindResponse(
                SmppStatus.Ok,
                32);
            var serializer = new UnbindResponseSerializer();

            var result = serializer.Serialize(pdu);

            CollectionAssert.AreEqual(expectedResult, result);
        }