Function TestDeviceStartStop

wgengine/magicsock/magicsock_test.go:605–635

TestDeviceStartStop exercises the startup and shutdown logic of wireguard-go, which is intimately intertwined with magicsock's own lifecycle. We seem to be good at generating deadlocks here, so if this test fails you should suspect a deadlock somewhere in startup or shutdown. It may be an infrequent

(t *testing.T)

// or shutdown. It may be an infrequent flake, so run with
// -count=10000 to be sure.
func TestDeviceStartStop(t *testing.T) {
	tstest.PanicOnLog()
	tstest.ResourceCheck(t)

	bus := eventbus.New()
	t.Cleanup(bus.Close)

	netMon, err := netmon.New(bus, logger.WithPrefix(t.Logf, "... netmon: "))
	if err != nil {
		t.Fatalf("netmon.New: %v", err)
	}
	defer netMon.Close()

	conn, err := NewConn(Options{
		EndpointsFunc: func(eps []tailcfg.Endpoint) {},
		Logf:          t.Logf,
		NetMon:        netMon,
		EventBus:      bus,
		Metrics:       new(usermetric.Registry),
	})
	if err != nil {
		t.Fatal(err)
	}
	defer conn.Close()

	tun := tuntest.NewChannelTUN()
	wgLogger := wglog.NewLogger(t.Logf)
	dev := wgcfg.NewDevice(tun.TUN(), conn.Bind(), wgLogger.DeviceLogger)
	dev.Up()
	dev.Close()
}

// Exercise a code path in sendDiscoMessage if the connection has been closed.
func TestConnClosed(t *testing.T) {