public async Task SendBufferedDataNull()
        {
            var m = NamespaceManager.CreateFromConnectionString(connection);
            var client = Substitute.For<IBusQueueClient>();

            var q = new BusQueueSender(Guid.NewGuid().ToString(), m, client);
            await q.SendBuffered(null, DateTime.UtcNow);
        }
        public async Task SendBuffered()
        {
            var m = NamespaceManager.CreateFromConnectionString(connection);
            var client = Substitute.For<IBusQueueClient>();
            client.Send(Arg.Any<BrokeredMessage>());

            var q = new BusQueueSender(Guid.NewGuid().ToString(), m, client);
            await q.SendBuffered(new object(), DateTime.UtcNow);

            client.Received().Send(Arg.Any<BrokeredMessage>());
        }