diff --git a/testing/scenarios/dokodemo_test.go b/testing/scenarios/dokodemo_test.go
index 74082b440..97b08e85b 100644
--- a/testing/scenarios/dokodemo_test.go
+++ b/testing/scenarios/dokodemo_test.go
@@ -16,6 +16,7 @@ import (
 	"v2ray.com/core/proxy/vmess/outbound"
 	"v2ray.com/core/testing/assert"
 	"v2ray.com/core/testing/servers/tcp"
+	"v2ray.com/core/testing/servers/udp"
 )
 
 func TestDokodemoTCP(t *testing.T) {
@@ -98,6 +99,104 @@ func TestDokodemoTCP(t *testing.T) {
 			IP:   []byte{127, 0, 0, 1},
 			Port: int(port),
 		})
+		assert.Error(err).IsNil()
+
+		payload := "dokodemo request."
+		nBytes, err := conn.Write([]byte(payload))
+		assert.Error(err).IsNil()
+		assert.Int(nBytes).Equals(len(payload))
+
+		response := make([]byte, 1024)
+		nBytes, err = conn.Read(response)
+		assert.Error(err).IsNil()
+		assert.Bytes(response[:nBytes]).Equals(xor([]byte(payload)))
+		assert.Error(conn.Close()).IsNil()
+	}
+
+	CloseAllServers()
+}
+
+func TestDokodemoUDP(t *testing.T) {
+	assert := assert.On(t)
+
+	udpServer := udp.Server{
+		MsgProcessor: xor,
+	}
+	dest, err := udpServer.Start()
+	assert.Error(err).IsNil()
+	defer udpServer.Close()
+
+	userID := protocol.NewID(uuid.New())
+	serverPort := pickPort()
+	serverConfig := &core.Config{
+		Inbound: []*core.InboundConnectionConfig{
+			{
+				PortRange: v2net.SinglePortRange(serverPort),
+				ListenOn:  v2net.NewIPOrDomain(v2net.LocalHostIP),
+				Settings: serial.ToTypedMessage(&inbound.Config{
+					User: []*protocol.User{
+						{
+							Account: serial.ToTypedMessage(&vmess.Account{
+								Id: userID.String(),
+							}),
+						},
+					},
+				}),
+			},
+		},
+		Outbound: []*core.OutboundConnectionConfig{
+			{
+				Settings: serial.ToTypedMessage(&freedom.Config{}),
+			},
+		},
+	}
+
+	clientPort := uint32(pickPort())
+	clientPortRange := uint32(5)
+	clientConfig := &core.Config{
+		Inbound: []*core.InboundConnectionConfig{
+			{
+				PortRange: &v2net.PortRange{From: clientPort, To: clientPort + clientPortRange},
+				ListenOn:  v2net.NewIPOrDomain(v2net.LocalHostIP),
+				Settings: serial.ToTypedMessage(&dokodemo.Config{
+					Address: v2net.NewIPOrDomain(dest.Address),
+					Port:    uint32(dest.Port),
+					NetworkList: &v2net.NetworkList{
+						Network: []v2net.Network{v2net.Network_UDP},
+					},
+				}),
+			},
+		},
+		Outbound: []*core.OutboundConnectionConfig{
+			{
+				Settings: serial.ToTypedMessage(&outbound.Config{
+					Receiver: []*protocol.ServerEndpoint{
+						{
+							Address: v2net.NewIPOrDomain(v2net.LocalHostIP),
+							Port:    uint32(serverPort),
+							User: []*protocol.User{
+								{
+									Account: serial.ToTypedMessage(&vmess.Account{
+										Id: userID.String(),
+									}),
+								},
+							},
+						},
+					},
+				}),
+			},
+		},
+	}
+
+	assert.Error(InitializeServerConfig(serverConfig)).IsNil()
+	assert.Error(InitializeServerConfig(clientConfig)).IsNil()
+
+	for port := clientPort; port <= clientPort+clientPortRange; port++ {
+		conn, err := net.DialUDP("udp", nil, &net.UDPAddr{
+			IP:   []byte{127, 0, 0, 1},
+			Port: int(port),
+		})
+		assert.Error(err).IsNil()
 
 		payload := "dokodemo request."
 		nBytes, err := conn.Write([]byte(payload))