如何使用 Mock 测试事件

Question

我需要测试事件。我在 class 中提出了一个事件，但我没有在我的测试中得到它。是什么原因？ Object_TransferInterruptedEvent1 是较新执行的。这是演示代码。

public class A
{
    public virtual event EventHandler<EventArgs<Tuple<Step, string>>> TransferInterruptedEvent;

    public void Test()
    {
         this.OnEventTransferInterrupted(this.CurrentStep, "Transfer not valid");
    }

    protected void OnEventTransferInterrupted(Step step, string errorMsg)
    {
        if (this.TransferInterruptedEvent != null)
        {
            this.TransferInterruptedEvent(this,new EventArgs<Tuple<object, string>>(new Tuple<object, string>(step, errorMsg)));
        }
    }
}

测试

var mock=new Mock<A>()
EventArgs<Tuple<S3Server.Step, string>>  mess;
mock.Object.TransferInterruptedEvent += Object_TransferInterruptedEvent1;
mock.Object.Test(); 

Assert.IsTrue(mess.Value.Item1 == S3Server.Step.TransferValidation);
Assert.IsTrue(mess.Value.Item2 == "Transfer not valid");

private void Object_TransferInterruptedEvent1(object sender, EventArgs<Tuple<object, string>> e) {
    mess=e;
}

Answer 1

设置模拟以调用基础class。通过设置 mock.CallBase = true; 这将允许模拟框架分配事件订阅。

[TestMethod]
public void _MockEvent() {
    //Arrange
    var mock = new Mock<A>();
    mock.CallBase = true;
    EventArgs<Tuple<Step, string>> mess = null;

    mock.Object.TransferInterruptedEvent += delegate(object sender, EventArgs<Tuple<Step, string>> e) {
        mess = e;
    };

    //Act
    mock.Object.Test();

    //Assert
    Assert.IsNotNull(mess);
    Assert.IsTrue(mess.Value.Item1 == Step.TransferValidation);
    Assert.IsTrue(mess.Value.Item2 == "Transfer not valid");
}

如何使用 Mock 测试事件

How to test event using Mock

c#

unit-testing

moq

mocking