package connection import ( "strconv" "sync" "testing" "time" "github.com/stretchr/testify/assert" ) func TestRegisterServerLocation(t *testing.T) { m := newTunnelMetrics() tunnels := 20 var wg sync.WaitGroup wg.Add(tunnels) for i := 0; i < tunnels; i++ { go func(i int) { id := strconv.Itoa(i) m.registerServerLocation(id, "LHR") wg.Done() }(i) } wg.Wait() for i := 0; i < tunnels; i++ { id := strconv.Itoa(i) assert.Equal(t, "LHR", m.oldServerLocations[id]) } wg.Add(tunnels) for i := 0; i < tunnels; i++ { go func(i int) { id := strconv.Itoa(i) m.registerServerLocation(id, "AUS") wg.Done() }(i) } wg.Wait() for i := 0; i < tunnels; i++ { id := strconv.Itoa(i) assert.Equal(t, "AUS", m.oldServerLocations[id]) } } func TestObserverEventsDontBlock(t *testing.T) { observer := NewObserver(&log, false) var mu sync.Mutex observer.RegisterSink(EventSinkFunc(func(_ Event) { // callback will block if lock is already held mu.Lock() mu.Unlock() })) timeout := time.AfterFunc(5*time.Second, func() { mu.Unlock() // release the callback on timer expiration t.Fatal("observer is blocked") }) mu.Lock() // block the callback for i := 0; i < 2 * observerChannelBufferSize; i++ { observer.sendRegisteringEvent() } if pending := timeout.Stop(); pending { // release the callback if timer hasn't expired yet mu.Unlock() } }