c# - Moq - mock.Raise 应该在没有设置的情况下在测试单元中引发事件

Question

我有一个演示器类，它附加了一个注入(inject) View 的事件。现在我想测试演示者对事件的正确 react 。

这是 View 界面IView:

public interface IView 
{
    event EventHandler MyEvent;
    void UpdateView(string test);
}

这是实现 IView 的 View :

public partial class MyView : IView
{
    public event EventHandler MyEvent;

    public MyView()
    {
        this.combo.SelectedIndexChanged += this.OnSelectedIndexChanged;
    }

    public void UpdateView(string test)
    {
        this.textBox.Text = test;
    }

    private OnSelectedIndexChanged(Object sender, EventArgs e)
    {
        if (this.MyEvent != null)
        {
            this.MyEvent(sender, e);
        }
    }
}

这是被测演示者:

public class MyPresenter
{
    private IView _view;
    public MyPresenter(IView view)
    {
        this._view = view;
        this._view.MyEvent += this.OnMyEvent;
    }

    private void OnMyEvent(Object sender, EventArgs e)
    {
        this._view.UpdateView();
    }
}

这是测试夹具测试MyPresenter:

[TestClass]
public class MyPresenterFixture()
{
    private MyPresenter testee;
    private Mock<IView> mockView;

    [TestMethod]
    public void ShouldReactOnMyEvent()
    {
        // arrange
        this.mockView = new Mock<IView>(MockBehavior.Strict);
        this.testee = new MyPresenter(this.mockView.Object);

        // act
        this.mockView.Raise(mock => mock.MyEvent += null); // this does not fire

        // assert and verify
        this.mockView.Verify(mock => mock.UpdateView(It.IsAny<string>());
    }
}

我正在使用 Moq 4。是否可以做我想做的事？

Answer 1

不需要传参吗？你的事件签名是EventHandler，也就是
(object sender, EventArgs e).

this.mockView.Raise(mock => mock.MyEvent += null, new EventArgs());

我从未使用过您在此处指定的重载...不过它似乎不正确。