func TestBasic(t *testing.T) {
  p := &Packet{}
  if err := p.Unmarshal([]byte{}); err == nil {
    t.Fatal("Unmarshal did not error on zero length packet")
  }
  rawPkt := []byte{
    0x90, 0xe0, 0x69, 0x8f, 0xd9, 0xc2, 0x93, 0xda, 0x1c, 0x64,
    0x27, 0x82, 0x00, 0x01, 0x00, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0x98, 0x36, 0xbe, 0x88, 0x9e,
  }
  parsedPacket := &Packet{
        // 固定頭部
    Header: Header{
      Marker:           true,
      Extension:        true,
      ExtensionProfile: 1,
      Extensions: []Extension{
        {0, []byte{
          0xFF, 0xFF, 0xFF, 0xFF,
        }},
      },
      Version:        2,
      PayloadOffset:  20,
      PayloadType:    96,
      SequenceNumber: 27023,
      Timestamp:      3653407706,
      SSRC:           476325762,
      CSRC:           []uint32{},
    },
        // 有效負載
    Payload: rawPkt[20:],
    Raw:     rawPkt,
  }
  // Unmarshal to the used Packet should work as well.
  for i := 0; i < 2; i++ {
    t.Run(fmt.Sprintf("Run%d", i+1), func(t *testing.T) {
      if err := p.Unmarshal(rawPkt); err != nil {
        t.Error(err)
      } else if !reflect.DeepEqual(p, parsedPacket) {
        t.Errorf("TestBasic unmarshal: got %#v, want %#v", p, parsedPacket)
      }
      if parsedPacket.Header.MarshalSize() != 20 {
        t.Errorf("wrong computed header marshal size")
      } else if parsedPacket.MarshalSize() != len(rawPkt) {
        t.Errorf("wrong computed marshal size")
      }
      if p.PayloadOffset != 20 {
        t.Errorf("wrong payload offset: %d != %d", p.PayloadOffset, 20)
      }
      raw, err := p.Marshal()
      if err != nil {
        t.Error(err)
      } else if !reflect.DeepEqual(raw, rawPkt) {
        t.Errorf("TestBasic marshal: got %#v, want %#v", raw, rawPkt)
      }
      if p.PayloadOffset != 20 {
        t.Errorf("wrong payload offset: %d != %d", p.PayloadOffset, 20)
      }
    })
  }
}

h.SequenceNumber = binary.BigEndian.Uint16(rawPacket[seqNumOffset : seqNumOffset+seqNumLength])
h.Timestamp = binary.BigEndian.Uint32(rawPacket[timestampOffset : timestampOffset+timestampLength])
h.SSRC = binary.BigEndian.Uint32(rawPacket[ssrcOffset : ssrcOffset+ssrcLength])

m := copy(buf[n:], p.Payload)
p.Raw = buf[:n+m]

func TestVP8PartitionHeadChecker_IsPartitionHead(t *testing.T) {
    checker := &VP8PartitionHeadChecker{}
    t.Run("SmallPacket", func(t *testing.T) {
        if checker.IsPartitionHead([]byte{0x00}) {
            t.Fatal("Small packet should not be the head of a new partition")
        }
    })
    t.Run("SFlagON", func(t *testing.T) {
        if !checker.IsPartitionHead([]byte{0x10, 0x00, 0x00, 0x00}) {
            t.Fatal("Packet with S flag should be the head of a new partition")
        }
    })
    t.Run("SFlagOFF", func(t *testing.T) {
        if checker.IsPartitionHead([]byte{0x00, 0x00, 0x00, 0x00}) {
            t.Fatal("Packet without S flag should not be the head of a new partition")
        }
    })
}