我正在对MVC应用程序进行单元测试。测试之一是验证我的控制器是否正确返回了提供的ID的数据。

要对其进行单元测试，我想将[TestMethod]中的数据添加到Context.DBSet中，然后调用我的Controller方法并验证其输出。

但是，我添加的记录未反映在Context.DBSet对象内。

下面是我当前拥有的代码。

    ///for purpose of unit testing,there is no underlying database
    public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
    {
        public ApplicationDbContext()
        {
            Database.SetInitializer(new ApplicationDbContextInitializer());
        }

        public static ApplicationDbContext Create()
        {
            return new ApplicationDbContext();
        }
        public DbSet<Book> Books { get; set; }
        public DbSet<Customer> Customers { get; set; }
    }

    public class ApplicationDbContextInitializer : CreateDatabaseIfNotExists<ApplicationDbContext>
    {
        protected override void Seed(ApplicationDbContext context)
        {
            InitializeBooks(context);
            InitializeCustomers(context);
            base.Seed(context);
        }
    }
    //for brevity,i haven't posted the InitializeBooks & InitializeCustomers()
    //these methods create Book and Customer objects
    //and do context.Book.Add(objBook) and context.Customer.Add(objCustomer)

我的Controller类具有DbContext对象，我可以在MS Test中使用它

    public class CustomersController : Controller
    {
        public ApplicationDbContext db = new ApplicationDbContext();

        ///other methods exist too
    }

最后我的MSTest

[TestMethod]
public void TestCustomerIDReplacedCorrectly()
{
    var objCtrl = new CustomersController();
    Customer objCust = new Customer()
    {
        Name = "Foo Bar",Address = "Hello World",};

    Console.WriteLine(objCtrl.db.Customers.Count()) //returns 4 correctly
    objCtrl.db.Customers.Add(objCust);
    Console.WriteLine(objCtrl.db.Customers.Count()) //still returns 4!? it should return 5

    ///calls are given to controller method
    ///to fetch ViewResult and ViewBag
    ///to validate if it is processing the
    ///instance put inside the objCtrl.db.Customers
}

我看到添加的客户没有被Customer的DbContext对象反映在内部，因此，即使我应该验证的实际控制器方法也无法反映我想要的行为。如何确保将我的objCust添加到objCtrl.db.Customers.Add

这是InitializeCustomers（）代码，它被称为种子输入

        private void InitializeCustomers(ApplicationDbContext context)
        {
            Customer cust1 = new Customer()
            {
                Name = "James Butt",Address = "6649 N Blue Gum St",Contact = "50-621 8927",NationalID = "12312312312"
            };

            Customer cust2 = new Customer()
            {
                Name = "Josephine Darakjy",Address = "Chanay,Jeffrey A Esq",Contact = "81-292 9840",NationalID = "123123124"
            };

            Customer cust3 = new Customer()
            {
                Name = "Art Venere",Address = "Chemel,James L Cpa",Contact = "85-636 8749",NationalID = "123123456"
            };


            Customer cust4 = new Customer()
            {
                Name = "Lenna Paprocki",Address = "Feltz Printing Service",Contact = "90-385 4412",NationalID = "32165498712"
            };

            context.Customers.Add(cust1);
            context.Customers.Add(cust2);
            context.Customers.Add(cust3);
            context.Customers.Add(cust4);

        }