public async Task AppendToToPublisher()
        {
            var appender = new MemoryAppendStoreAsync();
            var es = new EventStoreAsync(appender);
            ITableReaderWriter<Saying> table = new MemoryHashTableWriter<Saying>();

            var publisher = new EventStoreAsyncPublisher(es, new AsyncProjectFromImplementation(new SayingHistoryProjection(table)));
            var dispatcher = new Sample.CommandServices.SaySomething(publisher);

            await
                dispatcher.GetExecutor(new SayCommand()
                {
                    PersonId = new PersonId(1),
                    Say = "I have something to say",
                    Timestamp = DateTime.UtcNow
                }).Execute();

            Assert.Equal(1, (await es.ReplayAll()).Events.Count);
            Assert.Equal(1, (await table.GetAll()).Count);
        }
        public async Task AppendToToPublisher()
        {
            var appender = new MemoryAppendStoreAsync();
            var es       = new EventStoreAsync(appender);
            ITableReaderWriter <Saying> table = new MemoryHashTableWriter <Saying>();

            var publisher  = new EventStoreAsyncPublisher(es, new AsyncProjectFromImplementation(new SayingHistoryProjection(table)));
            var dispatcher = new Sample.CommandServices.SaySomething(publisher);

            await
            dispatcher.GetExecutor(new SayCommand()
            {
                PersonId  = new PersonId(1),
                Say       = "I have something to say",
                Timestamp = DateTime.UtcNow
            }).Execute();

            Assert.Equal(1, (await es.ReplayAll()).Events.Count);
            Assert.Equal(1, (await table.GetAll()).Count);
        }