为什么 MOQ 框架会覆盖所有虚拟方法 - c#

Question

我是 C# 的 MOQ 新手。 这是我的代码：

   public class CustomerBase
    {
        private List<Customer> customers = new List<Customer>();
        public const int MAX_CUSTOMERS = 100;

        public int CustomerCount()
        {
            return customers.Count();
        }

        public void AddCustomer(string name, string email)
        {
            if (CustomerCount() >= MAX_CUSTOMERS)
            {
                return;
            }
            Customer cus = new Customer(name);
            customers.Add(cus);
            SendEmail(email);
        }

        public virtual void SendEmail(string email)
        {
            throw new NotImplementedException();
        }
    }

    [TestClass]
    public class UnitTest1
    {
        [TestMethod]
        public void TestAddUser()
        {
            Mock<CustomerBase> m = new Mock<CustomerBase>();
            m.Setup(x => x.SendEmail("k")).Verifiable(); // bypass send email because email is server is not setup
            m.Object.AddCustomer("max", "k@g");
            Assert.AreEqual(1, m.Object.CustomerCount());
        }
  }

测试通过。一旦我将 CustomerCount 设为虚拟，测试就会失败，因为该方法开始返回零。 有谁知道为什么以及如何防止这种行为？

---

更新代码 - 使用内部程序集失败：

   [assembly: InternalsVisibleTo("UnitTestProject1")] // make the test assembly internal
namespace MoqSmple1
{
    public class CustomerBase
    {
        private List<Customer> customers = new List<Customer>();
        public const int MAX_CUSTOMERS = 100;

        internal virtual int CustomerCount()
        {
            return customers.Count();
        }

        public void AddCustomer(string name, string email)
        {
            if (CustomerCount() >= MAX_CUSTOMERS)
            {
                return;
            }
            Customer cus = new Customer(name);
            customers.Add(cus);
            SendEmail(email);
        }

        internal virtual void SendEmail(string email)
        {
            throw new NotImplementedException();
        }
    }
}

namespace UnitTestProject1
{
    [TestClass]
    public class UnitTest1
    {
        [TestMethod]
        public void TestAddUser()
        {
            Mock<CustomerBase> m = new Mock<CustomerBase>();
            m.Setup(x => x.SendEmail("k")).Verifiable(); // bypass send email because email is server is not setup
            m.Object.AddCustomer("max", "k@g");
            m.CallBase = true;// keep the default behaviour of virtual methods except the ones skipped
            Assert.AreEqual(1, m.Object.CustomerCount());
        }
    }
}

更新 我想通了：

• 我需要一个公钥
• 我需要将方法设为内部受保护虚拟

Answer 1

你想设置<YourMock>.CallBase = true。 Here is a good article on CallBase

简而言之，Moq 默认会为所有虚拟方法创建一个代理，并且将 CallBase 设置为 true 会保留默认实现，除非您明确要求代理。