c# - 升级到 Moq 上的接口(interface)不起作用

Question

我正在使用 moq为了我的测试。我将对象上传到它的接口(interface)并发现了一个问题。

下面是显示问题的测试。

• 对象

  public interface IVehicle { string Model { get; } }
  public interface ICar : IVehicle { }
  public class Golf : ICar
  {
      public Golf(string model)
      {
          this.Model = model;
      }
  
      public string Model { get; private set; }
  }
  

• 测试失败

  [TestMethod]
  public void InheritanceInterface_Test_WithMoq()
  {
      string golfmodel = "gti";
      var gti = new Moq.Mock<Golf>(golfmodel).Object;
      var safeVehicle = gti as IVehicle;
      var vehicle = (IVehicle)gti;
      var safeCar = gti as ICar;
      var car = (ICar)gti;
  
      Assert.AreEqual(golfmodel, gti.Model, string.Format(" Model:{0} | Golf Model:{1}", golfmodel, gti.Model));
      Assert.AreEqual(gti.Model, safeVehicle.Model, string.Format("Golf Model:{0} | Vehicle Model:{1}", gti.Model, safeVehicle.Model));
      Assert.AreEqual(gti.Model, vehicle.Model, string.Format("Golf Model:{0} | Vehicle Model:{1}", gti.Model, vehicle.Model));
      Assert.AreEqual(gti.Model, safeCar.Model, string.Format("Golf Model:{0} | Carro Model:{1}", gti.Model, safeCar.Model));
      Assert.AreEqual(gti.Model, car.Model, string.Format("Golf Model:{0} | Carro Model:{1}", gti.Model, car.Model));
  }
  

• 测试通过

  [TestMethod]
  public void InheritanceInterface_Test()
  {
      string golfmodel = "gti";
      var gti = new Golf(golfmodel);
      var vehicle = (IVehicle)gti;
      var car = (ICar)gti;
  
      Assert.AreEqual(golfmodel, gti.Model, string.Format(" Model:{0} | Golf Model:{1}", golfmodel, gti.Model));
      Assert.AreEqual(gti.Model, vehicle.Model, string.Format("Golf Model:{0} | Vehicle Model:{1}", gti.Model, vehicle.Model));
      Assert.AreEqual(gti.Model, car.Model, string.Format("Golf Model:{0} | Carro Model:{1}", gti.Model, car.Model));
  }
  

我如何更改它以便在我施放 Mock<Golf>.Object 时到它的接口(interface)之一，我仍然可以访问 Model属性(property)？

Answer 1

默认情况下，当您 Mock 一个具体类型时，Moq 不会向下调用虚拟方法或实现接口(interface)。只有当您告诉它它可以调用基本实现时它才会这样做，否则它会假定您将在需要调用它们时设置这些方法。如果您将测试更改为以下内容，它将起作用:

[TestMethod]
public void InheritanceInterface_Test_WithMoq()
{
    string golfmodel = "gti";
    var golfMock = new Moq.Mock<Golf>(golfmodel);

    golfMock.CallBase = true;  // Tell the mock to call base methods

    var gti = golfMock.Object;
    var safeVehicle = gti as IVehicle;
    var vehicle = (IVehicle)gti;
    var safeCar = gti as ICar;
    var car = (ICar)gti;

    Assert.AreEqual(golfmodel, gti.Model, string.Format(" Model:{0} | Golf Model:{1}", golfmodel, gti.Model));
    Assert.AreEqual(gti.Model, safeVehicle.Model, string.Format("Golf Model:{0} | Vehicle Model:{1}", gti.Model, safeVehicle.Model));
    Assert.AreEqual(gti.Model, vehicle.Model, string.Format("Golf Model:{0} | Vehicle Model:{1}", gti.Model, vehicle.Model));
    Assert.AreEqual(gti.Model, safeCar.Model, string.Format("Golf Model:{0} | Carro Model:{1}", gti.Model, safeCar.Model));
    Assert.AreEqual(gti.Model, car.Model, string.Format("Golf Model:{0} | Carro Model:{1}", gti.Model, car.Model));
}