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

pkg/msg/conn_test.go

@@ -0,0 +1,56 @@
+// 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 msg
+
+import (
+	"net"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/fatedier/frp/pkg/proto/wire"
+)
+
+func TestConnReadWriteMsg(t *testing.T) {
+	tests := []struct {
+		name     string
+		protocol string
+	}{
+		{name: "v1", protocol: wire.ProtocolV1},
+		{name: "v2", protocol: wire.ProtocolV2},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			client, server := net.Pipe()
+			defer client.Close()
+			defer server.Close()
+
+			clientConn := NewConn(client, NewReadWriter(client, tt.protocol))
+			serverConn := NewConn(server, NewReadWriter(server, tt.protocol))
+
+			in := &Ping{PrivilegeKey: "key", Timestamp: 123}
+			errCh := make(chan error, 1)
+			go func() {
+				errCh <- clientConn.WriteMsg(in)
+			}()
+
+			out, err := serverConn.ReadMsg()
+			require.NoError(t, err)
+			require.Equal(t, in, out)
+			require.NoError(t, <-errCh)
+		})
+	}
+}