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

        public async Task RemovingDocumentShouldDeleteReducedIndex()
        {
            _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())
            {
                Assert.Equal(10, await session.QueryAsync().For<Article>().Count());
                Assert.Equal(4, await session.QueryIndexAsync<ArticlesByDay>().Count());
            }

            // delete a document
            using (var session = _store.CreateSession())
            {
                var article = await session.QueryAsync<Article, ArticlesByDay>().Where(b => b.DayOfYear == new DateTime(2011, 11, 4).DayOfYear).FirstOrDefault();
                Assert.NotNull(article);
                session.Delete(article);
            }

            // there should be only 3 indexes left
            using (var session = _store.CreateSession())
            {
                // document was deleted
                Assert.Equal(9, await session.QueryAsync().For<Article>().Count());
                // index was deleted
                Assert.Equal(3, await session.QueryIndexAsync<ArticlesByDay>().Count());
            }
        }