public void GetAllOrderedByDate_ReturnsItemsInCorrectOrder()
        {
            // Arrange
            var context  = this.ServiceProvider.GetRequiredService <WmipDbContext>();
            var article1 = new Article {
                Id = 1, Title = "ar1", User = new User {
                    UserName = "******"
                }, Ratings = new List <Rating>()
            };
            var article2 = new Article {
                Id = 2, Title = "art2", User = new User {
                    UserName = "******"
                }, Ratings = new List <Rating>()
            };
            var article3 = new Article {
                Id = 3, Title = "art3", User = new User {
                    UserName = "******"
                }, Ratings = new List <Rating>()
            };

            context.Articles.AddRange(article1, article2, article3);
            context.SaveChanges();
            var articlesService = new ArticlesService(context);

            // Act
            var result = articlesService.GetAllOrderedByDate("aaa").ToList();

            //Assert
            Assert.Equal(3, result.Count);
        }