引发模拟对象的事件并作为用于调用方法的参数对象传递给那里

Question

我有一个接口

IPeakCommunication

和派生类

PeakCommunication

。在派生类中，我有一个方法

Send(RequestData request)

的实现，它可以执行某些操作，并且正如我所期望的那样调用事件

RequestReceived

并传递参数

request

。

我会为一些与

IPeakCommunication

交互的类创建单元测试，并调用

Send(RequestData request)

方法。但我不知道如何创建一个 Mock，它从参数中获取一个对象并使用它来调用

RequestReceived

事件。

public interface IPeakCommunication : IDisposable
{
#region Delegates
delegate void PeakRequestReceivedHandler(RequestData data);
#endregion

#region Events
event PeakRequestReceivedHandler? RequestReceived;
#endregion

#region Methods
void Send(RequestData data);
#endregion
}

我尝试制作的代码：

var mockCommunication = new Mock<IPeakCommunication>();
mockCommunication.Setup(x => x.Send(It.IsAny<RequestData>()))
    .Raises(x => x.RequestReceived += null, new object[] { /*argument from Send()?*/ } );

Answer 1

您可以使用

Callback

：

var mockCommunication = new Mock<IPeakCommunication>();

// Setup with callback which uses Raise
mockCommunication.Setup(x => x.Send(It.IsAny<RequestData>()))
    .Callback((RequestData r) => 
        mockCommunication.Raise(c => c.RequestReceived += null, r));

// Act
var obj = mockCommunication.Object;
// sample subscriber:
obj.RequestReceived += rd => Console.WriteLine(rd.Data);
obj.Send(new RequestData { Data = 42 }); // Prints 42

// sample data object
public class RequestData
{
    public int Data { get; set; }
}

演示@dotnetfiddle.net