diff --git a/common/net/port_test.go b/common/net/port_test.go
new file mode 100644
index 000000000..d1570a4d6
--- /dev/null
+++ b/common/net/port_test.go
@@ -0,0 +1,19 @@
+package net_test
+
+import (
+	"testing"
+
+	. "github.com/v2ray/v2ray-core/common/net"
+	v2testing "github.com/v2ray/v2ray-core/testing"
+	"github.com/v2ray/v2ray-core/testing/assert"
+)
+
+func TestPortRangeContains(t *testing.T) {
+	v2testing.Current(t)
+
+	portRange := &PortRange{
+		From: Port(53),
+		To:   Port(53),
+	}
+	assert.Bool(portRange.Contains(Port(53))).IsTrue()
+}