test: update

tests/echo_server.go

@@ -0,0 +1,43 @@
+package tests
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+
+	"github.com/fatedier/frp/utils/net"
+)
+
+func StartEchoServer() {
+	l, err := net.ListenTcp("127.0.0.1", 10701)
+	if err != nil {
+		fmt.Printf("echo server listen error: %v\n", err)
+		return
+	}
+
+	for {
+		c, err := l.Accept()
+		if err != nil {
+			fmt.Printf("echo server accept error: %v\n", err)
+			return
+		}
+
+		go echoWorker(c)
+	}
+}
+
+func echoWorker(c net.Conn) {
+	br := bufio.NewReader(c)
+	for {
+		buf, err := br.ReadString('\n')
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			fmt.Printf("echo server read error: %v\n", err)
+			return
+		}
+
+		c.Write([]byte(buf + "\n"))
+	}
+}