public void UpdateProductCategory() { NorthwindDataStore northwindDataStore = new NorthwindDataStore(); List <CategoryInfo> categoryInfos = northwindDataStore.GetCategoriesInfo(); List <Product> productsToChange = categoryInfos.FirstOrDefault().Products.Skip(2).ToList(); Category newCategory = categoryInfos.Last().Category; CategoryInfo categoryInfo = northwindDataStore.GetCategoryInfo(newCategory); northwindDataStore.UpdateProductsCategory(productsToChange, newCategory); Assert.AreNotEqual(categoryInfo.Products.Count, northwindDataStore.GetCategoryInfo(newCategory).Products.Count); }