diff --git a/pkg/rtmp/chunk_divider_test.go b/pkg/rtmp/chunk_divider_test.go
new file mode 100644
index 0000000..3f4dfff
--- /dev/null
+++ b/pkg/rtmp/chunk_divider_test.go
@@ -0,0 +1,73 @@
+// Copyright 2023, Chef.  All rights reserved.
+// https://github.com/q191201771/lal
+//
+// Use of this source code is governed by a MIT-style license
+// that can be found in the License file.
+//
+// Author: Chef (191201771@qq.com)
+
+package rtmp
+
+import (
+	"github.com/q191201771/lal/pkg/base"
+	"github.com/q191201771/naza/pkg/assert"
+	"github.com/q191201771/naza/pkg/bele"
+	"testing"
+)
+
+func TestMessage2Chunks(t *testing.T) {
+	capa := LocalChunkSize * 10
+	goldBuf := make([]byte, capa)
+	for i := 0; i < capa; i++ {
+		goldBuf[i] = byte(i % 256)
+	}
+
+	var packFn = func(testLen uint32) []byte {
+		h := base.RtmpHeader{
+			Csid:         CsidVideo,
+			MsgLen:       testLen,
+			MsgTypeId:    base.RtmpTypeIdVideo,
+			MsgStreamId:  Msid1,
+			TimestampAbs: 123,
+		}
+		return Message2Chunks(goldBuf[:testLen], &h)
+	}
+
+	// 07    00 00 7b   00 00 01  09      01 00 00 00  00
+	// csid  timestamp  len       typeid  streamid     v
+
+	goldHeaderHex := []byte{7, 0, 0, 0x7b, 0, 0, 1, 9, 1, 0, 0, 0}
+	testLenArray1 := []int{1, 2, 4095, 4096}
+	for _, testLen := range testLenArray1 {
+		m := packFn(uint32(testLen))
+		bele.BePutUint24(goldHeaderHex[4:], uint32(testLen))
+		assert.Equal(t, append(goldHeaderHex, goldBuf[:testLen]...), m)
+	}
+
+	goldHeaderHex21 := []byte{7, 0, 0, 0x7b, 0, 0, 1, 9, 1, 0, 0, 0}
+	goldHeaderHex22 := []byte{0xc7} // c fmt=3, 7 csid
+	testLenArray2 := []int{4097, 4098, 8191, 8192}
+	for _, testLen := range testLenArray2 {
+		m := packFn(uint32(testLen))
+		bele.BePutUint24(goldHeaderHex21[4:], uint32(testLen))
+		exp := append(goldHeaderHex21, goldBuf[:4096]...)
+		exp = append(exp, goldHeaderHex22...)
+		exp = append(exp, goldBuf[4096:testLen]...)
+		assert.Equal(t, exp, m)
+	}
+
+	goldHeaderHex31 := []byte{7, 0, 0, 0x7b, 0, 0, 1, 9, 1, 0, 0, 0}
+	goldHeaderHex32 := []byte{0xc7} // c fmt=3, 7 csid
+	goldHeaderHex33 := []byte{0xc7} // c fmt=3, 7 csid
+	testLenArray3 := []int{8193, 8194, 4096 * 3}
+	for _, testLen := range testLenArray3 {
+		m := packFn(uint32(testLen))
+		bele.BePutUint24(goldHeaderHex31[4:], uint32(testLen))
+		exp := append(goldHeaderHex31, goldBuf[:4096]...)
+		exp = append(exp, goldHeaderHex32...)
+		exp = append(exp, goldBuf[4096:8192]...)
+		exp = append(exp, goldHeaderHex33...)
+		exp = append(exp, goldBuf[8192:testLen]...)
+		assert.Equal(t, exp, m)
+	}
+}