diff --git a/server_test.go b/server_test.go
index b5d8f77..55cc01d 100644
--- a/server_test.go
+++ b/server_test.go
@@ -1,10 +1,10 @@
 package main
 
 import (
-	"bytes"
 	"io/ioutil"
 	"net"
 	"net/http"
+	"net/url"
 	"testing"
 	"time"
 
@@ -13,127 +13,125 @@ import (
 	"gopkg.in/yaml.v2"
 )
 
-func TestServer(t *testing.T) {
-	cfgfile := "config.example.yaml"
-	data, err := ioutil.ReadFile(cfgfile)
-	if err != nil {
-		log.Fatal(err)
-	}
-	var cfg conf
-	if err := yaml.Unmarshal(data, &cfg); err != nil {
-		log.Fatal(err)
-	}
-	makeServers(cfg)
-	l1, err := net.Listen("tcp", "127.0.0.1:2903")
+func echoServer(addr string) {
+	l1, err := net.Listen("tcp", addr)
 	if err != nil {
-		t.Fatal(err)
+		log.Errorln(err)
+		return
 	}
-	go func() {
-		defer l1.Close()
-		for {
-
-			c1, err := l1.Accept()
-			if err != nil {
-				log.Errorln(err)
-				return
-			}
-			go func(c net.Conn) {
-				defer c.Close()
-				data := make([]byte, 1024)
-				for {
-					n, err := c.Read(data)
-					if err != nil {
-						log.Errorln(err)
-						break
-					}
-					c.Write(data[:n])
-					log.Infof("2903 receive: %s", string(data[:n]))
-				}
-			}(c1)
+	defer l1.Close()
+
+	for {
+		c1, err := l1.Accept()
+		if err != nil {
+			log.Errorln(err)
+			return
 		}
-	}()
-	l2, err := net.Listen("tcp", "127.0.0.1:2904")
-	if err != nil {
-		t.Fatal(err)
-	}
-	go func() {
-		defer l2.Close()
-		for {
-			c1, err := l2.Accept()
-			if err != nil {
-				log.Errorln(err)
-			}
-			go func(c net.Conn) {
-				defer c.Close()
-				data := make([]byte, 1024)
-				for {
-					n, err := c.Read(data)
-					if err != nil {
-						log.Errorln(err)
-						break
-					}
-					c.Write(data[:n])
-					log.Infof("2904 receive: %s", string(data[:n]))
+		go func(c net.Conn) {
+			defer c.Close()
+			data := make([]byte, 1024)
+			for {
+				n, err := c.Read(data)
+				if err != nil {
+					log.Errorln(err)
+					break
 				}
-			}(c1)
-		}
-	}()
+				c.Write(data[:n])
+				log.Infof("%s receive: %s", addr, data[:n])
+			}
+		}(c1)
+	}
+}
 
-	time.Sleep(time.Second)
-	c1, resp, err := dialer.Dial("ws://127.0.0.1:2901/p1", nil)
-	if err != nil {
-		t.Fatal(err)
+func sendAndRecv(addr string, msg string) string {
+	u, _ := url.Parse(addr)
+	if u.Scheme == "ws" || u.Scheme == "wss" {
+		return _sendAndRecvWS(addr, msg)
 	}
-	if resp.StatusCode != http.StatusSwitchingProtocols {
-		t.Fatalf("dial ws code %d", resp.StatusCode)
+	if u.Scheme == "tcp" {
+		return _sendAndRecvTCP(addr, msg)
 	}
-	err = c1.WriteMessage(websocket.BinaryMessage, []byte("p1"))
+	return ""
+}
+
+func _sendAndRecvTCP(addr string, msg string) string {
+	u, _ := url.Parse(addr)
+	c, err := net.Dial("tcp", u.Host)
 	if err != nil {
-		t.Fatal(err)
+		log.Errorln(err)
+		return ""
 	}
-	_, d, err := c1.ReadMessage()
+
+	_, err = c.Write([]byte(msg))
 	if err != nil {
-		t.Fatal(err)
-	}
-	if !bytes.Equal([]byte("p1"), d) {
-		t.Errorf("failed msg not equal, expect p1, got %s", d)
+		log.Errorln(err)
+		return ""
 	}
-	c2, resp, err := dialer.Dial("ws://127.0.0.1:2901/p2", nil)
+
+	data := make([]byte, 100)
+	n, err := c.Read(data)
 	if err != nil {
-		t.Fatal(err)
+		log.Errorln(err)
+		return ""
 	}
+	return string(data[:n])
+}
+
+func _sendAndRecvWS(addr string, msg string) string {
+	c1, resp, err := dialer.Dial(addr, nil)
 	if err != nil {
-		t.Fatal(err)
+		log.Errorln(err)
+		return ""
 	}
 	if resp.StatusCode != http.StatusSwitchingProtocols {
-		t.Fatalf("dial ws code %d", resp.StatusCode)
+		log.Errorf("dial ws code %d", resp.StatusCode)
 	}
-	err = c2.WriteMessage(websocket.BinaryMessage, []byte("p2"))
+	err = c1.WriteMessage(websocket.BinaryMessage, []byte(msg))
 	if err != nil {
-		t.Fatal(err)
+		log.Errorln(err)
+		return ""
 	}
-	_, d, err = c2.ReadMessage()
+	_, d, err := c1.ReadMessage()
 	if err != nil {
-		t.Fatal(err)
-	}
-	if !bytes.Equal([]byte("p2"), d) {
-		t.Errorf("failed msg not equal, expect p2, got %s", d)
+		log.Errorln(err)
+		return ""
 	}
+	return string(d)
+}
 
-	c3, err := net.Dial("tcp", "127.0.0.1:2905")
-	if err != nil {
-		t.Fatal(err)
-	}
-	_, err = c3.Write([]byte("c3"))
+func TestServer(t *testing.T) {
+	cfgfile := "config.example.yaml"
+
+	log.Default.Level = log.DEBUG
+
+	data, err := ioutil.ReadFile(cfgfile)
 	if err != nil {
-		t.Fatal(err)
+		log.Fatal(err)
 	}
-	d2 := make([]byte, 20)
-	n, err := c3.Read(d2)
-	if err != nil {
-		t.Fatal(err)
+	var cfg conf
+	if err := yaml.Unmarshal(data, &cfg); err != nil {
+		log.Fatal(err)
 	}
-	if !bytes.Equal([]byte("c3"), d2[:n]) {
-		t.Errorf("failed msg not equal, expect c3, got %s", d2[:n])
+
+	makeServers(cfg)
+
+	go echoServer("127.0.0.1:2903")
+	go echoServer("127.0.0.1:2904")
+
+	time.Sleep(time.Second)
+
+	testdata := []struct {
+		addr string
+		msg  string
+	}{
+		{"ws://127.0.0.1:2901/p1", "p1"},
+		{"ws://127.0.0.1:2901/p2", "p2"},
+		{"tcp://127.0.0.1:2905", "c3"},
+	}
+	for _, tt := range testdata {
+		_m := sendAndRecv(tt.addr, tt.msg)
+		if _m != tt.msg {
+			t.Errorf("expected %s, got %s", tt.msg, _m)
+		}
 	}
 }