public async Task EditByIdShouldChangeTheCategoryName() { var options = new DbContextOptionsBuilder <ApplicationDbContext>() .UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString()).Options; AutoMapperConfig.RegisterMappings(Assembly.Load("CookingBook.Web.ViewModels")); var dbContext = new ApplicationDbContext(options); dbContext.Add(new Category { Id = 1, Title = "firstCategory", Image = "firstImage" }); dbContext.Add(new Category { Id = 2, Title = "secondCategory", Image = "secondImage" }); dbContext.Add(new Category { Id = 3, Title = "thirdCategory", Image = "thirdImage" }); await dbContext.SaveChangesAsync(); var repository = new EfDeletableEntityRepository <Category>(dbContext); var service = new CategoriesService(repository); await service.EditById(2, "secondCategoryNew"); Assert.Equal("secondCategoryNew", dbContext.Categories.FirstOrDefaultAsync(x => x.Id == 2).Result.Title); Assert.DoesNotContain(new Category { Id = 2, Title = "secondCategory", Image = "secondImage" }, dbContext.Categories); await Assert.ThrowsAnyAsync <Exception>(() => service.EditById(222, "asdf")); }