diff --git a/internal/rtmp/bytecounter/reader_test.go b/internal/rtmp/bytecounter/reader_test.go
new file mode 100644
index 00000000..6778f375
--- /dev/null
+++ b/internal/rtmp/bytecounter/reader_test.go
@@ -0,0 +1,21 @@
+package bytecounter
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestReader(t *testing.T) {
+	var buf bytes.Buffer
+	buf.Write(bytes.Repeat([]byte{0x01}, 1024))
+
+	r := NewReader(&buf)
+	buf2 := make([]byte, 64)
+	n, err := r.Read(buf2)
+	require.NoError(t, err)
+	require.Equal(t, 64, n)
+
+	require.Equal(t, uint32(1024), r.Count())
+}
diff --git a/internal/rtmp/bytecounter/writer_test.go b/internal/rtmp/bytecounter/writer_test.go
new file mode 100644
index 00000000..b2ecae4d
--- /dev/null
+++ b/internal/rtmp/bytecounter/writer_test.go
@@ -0,0 +1,15 @@
+package bytecounter
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestWriter(t *testing.T) {
+	var buf bytes.Buffer
+	w := NewWriter(&buf)
+	w.Write(bytes.Repeat([]byte{0x01}, 64))
+	require.Equal(t, uint32(64), w.Count())
+}