public void GetAllCategoriesMethodTest() { Category category1 = new Category { Id = "1111111", Name = "Category 1" }; Category category2 = new Category { Id = "2222222", Name = "Category 2" }; Category category3 = new Category { Id = "3333333", Name = "Category 3" }; using (var bc = new BusinessContext()) { bc.AddNewCategory(category1); bc.AddNewCategory(category2); bc.AddNewCategory(category3); ICollection <Category> categories = (ICollection <Category>)bc.GetAllCategories(); Assert.IsTrue(categories.Contains(category1)); Assert.IsTrue(categories.Contains(category2)); Assert.IsTrue(categories.Contains(category3)); } }