public async Task TestCloseWhenQueueFull() { TimeSpan neverFlushInterval = TimeSpan.FromHours(1); _reporter = new RemoteReporter(_sender, neverFlushInterval, MaxQueueSize, _metrics, _loggerFactory); SetupTracer(); // change sender to blocking mode _sender.BlockAppend(); // fill the queue for (int i = 0; i < MaxQueueSize + 10; i++) { _reporter.Report(NewSpan()); } var closeTimeout = new CancellationTokenSource(_closeTimeout).Token; await _reporter.CloseAsync(closeTimeout).ConfigureAwait(false); // expect no exception thrown }