diff --git a/utils/util/util_test.go b/utils/util/util_test.go
index 8210c61..17d7754 100644
--- a/utils/util/util_test.go
+++ b/utils/util/util_test.go
@@ -20,3 +20,67 @@ func TestGetAuthKey(t *testing.T) {
 	t.Log(key)
 	assert.Equal("6df41a43725f0c770fd56379e12acf8c", key)
 }
+
+func TestGetPortRanges(t *testing.T) {
+	assert := assert.New(t)
+
+	rangesStr := "2000-3000,3001,4000-50000"
+	expect := [][2]int64{
+		[2]int64{2000, 3000},
+		[2]int64{3001, 3001},
+		[2]int64{4000, 50000},
+	}
+	actual, err := GetPortRanges(rangesStr)
+	assert.Nil(err)
+	t.Log(actual)
+	assert.Equal(expect, actual)
+}
+
+func TestContainsPort(t *testing.T) {
+	assert := assert.New(t)
+
+	rangesStr := "2000-3000,3001,4000-50000"
+	portRanges, err := GetPortRanges(rangesStr)
+	assert.Nil(err)
+
+	type Case struct {
+		Port   int64
+		Answer bool
+	}
+	cases := []Case{
+		Case{
+			Port:   3001,
+			Answer: true,
+		},
+		Case{
+			Port:   3002,
+			Answer: false,
+		},
+		Case{
+			Port:   44444,
+			Answer: true,
+		},
+	}
+	for _, elem := range cases {
+		ok := ContainsPort(portRanges, elem.Port)
+		assert.Equal(elem.Answer, ok)
+	}
+}
+
+func TestPortRangesCut(t *testing.T) {
+	assert := assert.New(t)
+
+	rangesStr := "2000-3000,3001,4000-50000"
+	portRanges, err := GetPortRanges(rangesStr)
+	assert.Nil(err)
+
+	expect := [][2]int64{
+		[2]int64{2000, 3000},
+		[2]int64{3001, 3001},
+		[2]int64{4000, 44443},
+		[2]int64{44445, 50000},
+	}
+	actual := PortRangesCut(portRanges, 44444)
+	t.Log(actual)
+	assert.Equal(expect, actual)
+}