public async Task ProcessOutboxMessages_WhenNoMessages_WaitsAccordingToBackoffStrategy()
{
_outboxStorage.When(o => o.Retrieve(_busDisposalCancellationTokenSource.Token, TopMessagesToRetrieve)).Do(
c =>
{
_busDisposalCancellationTokenSource.Cancel();
});
await _processor.Run();
await _backoffStrategy.Received().WaitNoMessageAsync(_busDisposalCancellationTokenSource.Token);
}