C#、Moq、单元测试：如何创建从另一个类继承的对象？

Question

我的类/接口设置如下：

Room.cs

//import statements

namespace namespace1
{
   internal class Room: Apartment
   {
      // constructor
      public Room(Furniture furniture) : base(furniture)
      {
      }
   }
}

公寓.cs

// import statements

namespace namespace2
{
   public abstract class Apartment: Building
   {
      private int numChairs = 0;

      // constructor
      protected Apartment(IFurniture furniture) : base(IFurniture furniture)
      {
         this.numChairs = furniture.chairs.Length;
      }
   }
}

建筑.cs

// import statements

namespace namespace3
{
   public abstract class Building
   {
      // constructor
      protected Building(IFurniture furniture)
      {
      }
   }
}

我想创建一个 Room 对象，并带有一个模拟的 Furniture 对象。这是我所做的：

[Test]
public void fun()
{
   var mockedFurniture = new Mock<IFurniture>();
   var room = new Room(mockedFurniture.Object);
}   

问题：因为

Room

的构造函数调用

base(furniture)

，所以

Apartment

的构造函数尝试访问

furniture.chairs

，即

null

。我怎么能嘲笑这个呢？

编辑

问题出在

Apartment.cs

。它尝试访问 Furniture.chairs，即

null

。这是 IFurniture.cs：

public interface IFurniture
{
   IChairs Chairs { get; }
}

Answer 1

根据你的例子，你也需要模拟

IChairs

。

var mockedChairs = new Mock<IChairs>();
var mockedFurniture = new Mock<IFurniture>();
mockedFurniture.Setup(q=>q.Chairs).Returns(mockedChairs.Object);
var room = new Room(mockedFurniture.Object);