如何在使用Moq的测试中引发事件? [英] How to raise an event in a test that uses Moq?

问题描述

这是父类中代码实现的一部分:

Here is part of code implementation in parent class:

handler.FooUpdateDelegate += FooUpdate(OnFooUpdate);
protected abstract void OnFooUpdate(ref IBoo boo, string s);

我在测试方法中有模拟处理程序:

I have in test method mocked handler:

Mock<IHandler> mHandler = mockFactory.Create<IHandler>();

这个...

mHandler.Raise(x => x.FooUpdateDelegate += null, boo, s);

...不起作用.它说:

...is not working. It says:

System.ArgumentException:无法找到附加或分离方法Void set_FooUpdateDelegate(FooUpdate)的事件.

System.ArgumentException : Could not locate event for attach or detach method Void set_FooUpdateDelegate(FooUpdate).

我想提高OnFooUpdate，以便触发要在子类中测试的代码.

I want to raise OnFooUpdate so it triggers the code to be tested in child class.

问题:如何使用Moq引发委托(不是公共事件处理程序)?

Question: How can I raise delegate (not common event handler) with Moq?

如果我完全错过了重点，请让我合格.

If I missed the point completely, please enligten me.

推荐答案

您似乎正在尝试引发一个委托而不是一个事件.是这样吗?

It looks like you are trying to raise a delegate rather than an event. Is this so?

您的代码是否与此相符?

Is your code along the lines of this?

public delegate void FooUpdateDelegate(ref int first, string second);

public class MyClass {
    public FooUpdateDelegate FooUpdateDelegate { get; set; }
}

public class MyWrapperClass {

    public MyWrapperClass(MyClass myclass) {
        myclass.FooUpdateDelegate += HandleFooUpdate;
    }

    public string Output { get; private set; }

    private void HandleFooUpdate(ref int i, string s) {
            Output = s;
    }

}

如果是这样，那么您可以像这样直接调用myClass FooUpdateDelegate

If so, then you can directly invoke the myClass FooUpdateDelegate like so

[TestMethod]
public void MockingNonStandardDelegate() {

    var mockMyClass = new Mock<MyClass>();
    var wrapper = new MyWrapperClass(mockMyClass.Object);

    int z = 19;
    mockMyClass.Object.FooUpdateDelegate(ref z, "ABC");

    Assert.AreEqual("ABC", wrapper.Output);

}

使用界面添加版本

public interface IMyClass
{
    FooUpdateDelegate FooUpdateDelegate { get; set; }
}    

public class MyClass : IMyClass {
    public FooUpdateDelegate FooUpdateDelegate { get; set; }
}

public class MyWrapperClass {

    public MyWrapperClass(IMyClass myclass) {
        myclass.FooUpdateDelegate += HandleFooUpdate;
    }

    public string Output { get; private set; }

    private void HandleFooUpdate(ref int i, string s) {
            Output = s;
    }

}


[TestMethod]
public void MockingNonStandardDelegate()
{

   var mockMyClass = new Mock<IMyClass>();
   // Test fails with a Null Reference exception if we do not set up
   //  the delegate property. 
   // Can also use 
   //  mockMyClass.SetupProperty(m => m.FooUpdateDelegate);

   mockMyClass.SetupAllProperties();

   var wrapper = new MyWrapperClass(mockMyClass.Object);

   int z = 19;
   mockMyClass.Object.FooUpdateDelegate(ref z, "ABC");

   Assert.AreEqual("ABC", wrapper.Output);

}

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