protocol: add AEAD encryption negotiation to v2 wire control channel (#5304)

server/service_test.go

@@ -0,0 +1,63 @@
+// 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 server
+
+import (
+	"errors"
+	"net"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestWriteWithDeadlineTimesOutAndClearsDeadline(t *testing.T) {
+	serverConn, clientConn := net.Pipe()
+	defer serverConn.Close()
+	defer clientConn.Close()
+
+	err := writeWithDeadline(serverConn, 50*time.Millisecond, func() error {
+		_, writeErr := serverConn.Write([]byte("x"))
+		return writeErr
+	})
+	require.Error(t, err)
+
+	var netErr net.Error
+	require.True(t, errors.As(err, &netErr))
+	require.True(t, netErr.Timeout())
+
+	readCh := make(chan byte, 1)
+	errCh := make(chan error, 1)
+	go func() {
+		buf := make([]byte, 1)
+		if _, readErr := clientConn.Read(buf); readErr != nil {
+			errCh <- readErr
+			return
+		}
+		readCh <- buf[0]
+	}()
+
+	_, err = serverConn.Write([]byte("y"))
+	require.NoError(t, err)
+
+	select {
+	case b := <-readCh:
+		require.Equal(t, byte('y'), b)
+	case err := <-errCh:
+		require.NoError(t, err)
+	case <-time.After(time.Second):
+		t.Fatal("timed out waiting for write after deadline reset")
+	}
+}