src/policy_manager/devicepolicy/dbus_notify_test.go

// Copyright 2021 Google LLC
//
// 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 devicepolicy

import (
	"os"
	"testing"
	"time"

	"github.com/godbus/dbus"
)

func dialDbus(address string) (conn *dbus.Conn, err error) {
	conn, err = dbus.Dial(address)
	if err != nil {
		return
	}
	if err = conn.Auth(nil); err != nil {
		conn.Close()
		return
	}
	if err = conn.Hello(); err != nil {
		conn.Close()
		return
	}

	return
}

func TestSignalPropertyChange(t *testing.T) {
	// Replace system bus with the session bus for this test.
	oldSystemBus := os.Getenv("DBUS_SYSTEM_BUS_ADDRESS")
	address := os.Getenv("DBUS_SESSION_BUS_ADDRESS")
	if address == "" {
		t.Skip("no session dbus")
		return
	}
	os.Setenv("DBUS_SYSTEM_BUS_ADDRESS", address)
	defer os.Setenv("DBUS_SYSTEM_BUS_ADDRESS", oldSystemBus)

	conn, err := dialDbus(address)
	if err != nil {
		t.Fatal(err)
	}
	defer conn.Close()

	// Subscribe to signals from SessionManager.
	conn.BusObject().Call("org.freedesktop.DBus.AddMatch", 0,
		"type='signal',path='/org/chromium/SessionManager',"+
			"interface='org.chromium.SessionManagerInterface',"+
			"sender='org.chromium.SessionManager'")
	c := make(chan *dbus.Signal, 1)
	conn.Signal(c)

	err = signalPropertyChange()
	if err != nil {
		t.Fatal(err)
	}

	select {
	case signal := <-c:
		if signal.Name != "org.chromium.SessionManagerInterface.PropertyChangeComplete" {
			t.Errorf("Wrong signal: %s", signal.Name)
		}
	case <-time.After(time.Second * 1):
		t.Error("Timeout waiting for signal")
	}
}