protocol: add v2 wire protocol with binary framing and capability negotiation (#5294)

server/proxy/proxy_test.go

@@ -0,0 +1,53 @@
+// Copyright 2026 The frp Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package proxy
+
+import (
+	"net"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/fatedier/frp/pkg/msg"
+)
+
+func TestWorkConnStartWritesStartWorkConn(t *testing.T) {
+	client, server := net.Pipe()
+	defer client.Close()
+	defer server.Close()
+
+	serverMsgConn := msg.NewConn(server, msg.NewV2ReadWriter(server))
+	clientMsgConn := msg.NewConn(client, msg.NewV2ReadWriter(client))
+	workConn := NewWorkConn(serverMsgConn)
+
+	in := &msg.StartWorkConn{ProxyName: "tcp", SrcAddr: "127.0.0.1", SrcPort: 1234}
+	type startResult struct {
+		conn net.Conn
+		err  error
+	}
+	resultCh := make(chan startResult, 1)
+	go func() {
+		conn, err := workConn.Start(in)
+		resultCh <- startResult{conn: conn, err: err}
+	}()
+
+	out, err := clientMsgConn.ReadMsg()
+	require.NoError(t, err)
+	require.Equal(t, in, out)
+
+	result := <-resultCh
+	require.NoError(t, result.err)
+	require.Same(t, serverMsgConn, result.conn)
+}