YesSql.Tests.CoreTests.ShouldReduceAndMergeWithDatabase C# (CSharp) Method

        public async Task ShouldReduceAndMergeWithDatabase()
        {
            _store.RegisterIndexes<ArticleIndexProvider>();

            using (var session = _store.CreateSession())
            {
                var dates = new[]
                {
                    new DateTime(2011, 11, 1),
                    new DateTime(2011, 11, 2),
                    new DateTime(2011, 11, 3),
                    new DateTime(2011, 11, 4),
                    new DateTime(2011, 11, 1),
                    new DateTime(2011, 11, 2),
                    new DateTime(2011, 11, 3),
                    new DateTime(2011, 11, 1),
                    new DateTime(2011, 11, 2),
                    new DateTime(2011, 11, 1)
                };

                var articles = dates.Select(x => new Article
                {
                    PublishedUtc = x
                });

                foreach (var article in articles)
                {
                    session.Save(article);
                }
            }

            using (var session = _store.CreateSession())
            {
                session.Save(new Article { PublishedUtc = new DateTime(2011, 11, 1) });
            }

            using (var session = _store.CreateSession())
            {
                Assert.Equal(4, await session.QueryIndexAsync<ArticlesByDay>().Count());

                Assert.Equal(1, await session.QueryIndexAsync<ArticlesByDay>(x => x.DayOfYear == new DateTime(2011, 11, 1).DayOfYear).Count());
                Assert.Equal(1, await session.QueryIndexAsync<ArticlesByDay>(x => x.DayOfYear == new DateTime(2011, 11, 2).DayOfYear).Count());
                Assert.Equal(1, await session.QueryIndexAsync<ArticlesByDay>(x => x.DayOfYear == new DateTime(2011, 11, 3).DayOfYear).Count());
                Assert.Equal(1, await session.QueryIndexAsync<ArticlesByDay>(x => x.DayOfYear == new DateTime(2011, 11, 4).DayOfYear).Count());

                Assert.Equal(5, await session.QueryAsync<Article, ArticlesByDay>(x => x.DayOfYear == new DateTime(2011, 11, 1).DayOfYear).Count());
                Assert.Equal(3, await session.QueryAsync<Article, ArticlesByDay>(x => x.DayOfYear == new DateTime(2011, 11, 2).DayOfYear).Count());
                Assert.Equal(2, await session.QueryAsync<Article, ArticlesByDay>(x => x.DayOfYear == new DateTime(2011, 11, 3).DayOfYear).Count());
                Assert.Equal(1, await session.QueryAsync<Article, ArticlesByDay>(x => x.DayOfYear == new DateTime(2011, 11, 4).DayOfYear).Count());
            }
        }