diff --git a/proto/snpb/log_io_test.go b/proto/snpb/log_io_test.go
new file mode 100644
index 000000000..caf060a8c
--- /dev/null
+++ b/proto/snpb/log_io_test.go
@@ -0,0 +1,73 @@
+package snpb_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/kakao/varlog/pkg/types"
+	"github.com/kakao/varlog/proto/snpb"
+)
+
+func TestValidateTopicLogStream(t *testing.T) {
+	type testMessage interface {
+		GetTopicID() types.TopicID
+		GetLogStreamID() types.LogStreamID
+	}
+	tcs := []struct {
+		msg   testMessage
+		isErr bool
+	}{
+		{
+			msg: &snpb.AppendRequest{
+				TopicID:     types.TopicID(1),
+				LogStreamID: types.LogStreamID(2),
+			},
+			isErr: false,
+		},
+		{
+			msg: &snpb.AppendRequest{
+				TopicID:     types.TopicID(0),
+				LogStreamID: types.LogStreamID(2),
+			},
+			isErr: true,
+		},
+		{
+			msg: &snpb.AppendRequest{
+				TopicID:     types.TopicID(-1),
+				LogStreamID: types.LogStreamID(2),
+			},
+			isErr: true,
+		},
+		{
+			msg: &snpb.AppendRequest{
+				TopicID:     types.TopicID(1),
+				LogStreamID: types.LogStreamID(0),
+			},
+			isErr: true,
+		},
+		{
+			msg: &snpb.AppendRequest{
+				TopicID:     types.TopicID(1),
+				LogStreamID: types.LogStreamID(-1),
+			},
+			isErr: true,
+		},
+	}
+
+	for _, tc := range tcs {
+		name := "unknown"
+		if s, ok := tc.msg.(fmt.Stringer); ok {
+			name = s.String()
+		}
+		t.Run(name, func(t *testing.T) {
+			err := snpb.ValidateTopicLogStream(tc.msg)
+			if tc.isErr {
+				require.Error(t, err)
+				return
+			}
+			require.NoError(t, err)
+		})
+	}
+}