Fix data race in TestCorrectStreamWakeup

syncapi/notifier/notifier_test.go

@@ -165,9 +165,9 @@ func TestCorrectStreamWakeup(t *testing.T) {
 
 	go func() {
 		select {
-		case <-streamone.signalChannel:
+		case <-streamone.ch():
 			awoken <- "one"
-		case <-streamtwo.signalChannel:
+		case <-streamtwo.ch():
 			awoken <- "two"
 		}
 	}()

syncapi/notifier/userstream.go

@@ -118,6 +118,12 @@ func (s *UserDeviceStream) TimeOfLastNonEmpty() time.Time {
 	return s.timeOfLastChannel
 }
 
+func (s *UserDeviceStream) ch() <-chan struct{} {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+	return s.signalChannel
+}
+
 // GetSyncPosition returns last sync position which the UserStream was
 // notified about
 func (s *UserDeviceStreamListener) GetSyncPosition() types.StreamingToken {