public void IterationSetup()
        {
            _backgroundWorker = new BackgroundWorker(new FakeTransport(), new SentryOptions {
                MaxQueueItems = 1000
            });
            _event    = new SentryEvent();
            _envelope = Envelope.FromEvent(_event);

            // Make sure worker spins once.
            _backgroundWorker.EnqueueEnvelope(_envelope);
            _backgroundWorker.FlushAsync(TimeSpan.FromSeconds(10)).GetAwaiter().GetResult();
            for (var i = 0; i < Items; i++)
            {
                _backgroundWorker.EnqueueEnvelope(_envelope);
            }
        }