test: more case

tests/echo_server.go

@@ -26,6 +26,24 @@ func StartEchoServer() {
 	}
 }
 
+func StartUdpEchoServer() {
+	l, err := net.ListenUDP("127.0.0.1", 10703)
+	if err != nil {
+		fmt.Printf("udp echo server listen error: %v\n", err)
+		return
+	}
+
+	for {
+		c, err := l.Accept()
+		if err != nil {
+			fmt.Printf("udp echo server accept error: %v\n", err)
+			return
+		}
+
+		go echoWorker(c)
+	}
+}
+
 func echoWorker(c net.Conn) {
 	br := bufio.NewReader(c)
 	for {