diff --git a/util/util_test.go b/util/util_test.go
new file mode 100644
index 0000000..3cfed48
--- /dev/null
+++ b/util/util_test.go
@@ -0,0 +1,55 @@
+// Copyright (c) 2023, donnie <donnie4w@gmail.com>
+// All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+//
+// github.com/donnie4w/tim
+//
+
+package util
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/donnie4w/simplelog/logging"
+)
+
+func TestMarkId(t *testing.T) {
+	var i int64 = 1 << 18
+	id := MaskId(i)
+	id2 := MaskId(id)
+	logging.Debug(i)
+	logging.Debug(id)
+	logging.Debug(id2)
+}
+
+func TestMark(t *testing.T) {
+	bs := []byte("hello world")
+	bs1 := Mask(bs)
+	bs2 := Mask(bs1)
+	logging.Debug(string(bs1))
+	logging.Debug(string(bs2))
+}
+
+func BenchmarkNodeName(b *testing.B) {
+	domain := "tt"
+	u := CreateUUID("aiaeinf22ienfefne1f", &domain)
+	fmt.Println(u)
+	fmt.Println(CheckUUID(2790553438565061983))
+}
+
+func BenchmarkUUIDByNode(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		domain := "tt"
+		CreateUUID("aiaeinfienfefne1f", &domain)
+	}
+}
+
+func BenchmarkSearchString(b *testing.B) {
+	fmt.Println(ContainStrings([]string{"ab", "b", "c"}, "ab"))
+}
+
+func BenchmarkSearchInt(b *testing.B) {
+	fmt.Println(ContainInt([]int{11, 22, 33, 44}, 33))
+}