Moq – mock.Raise应该在没有安装程序的情况下在测试单元中引发事件

我有一个演示者类，它附加了注入视图的事件。 现在我想测试演示者对事件的正确反应。

这是视图界面IView：

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

这是实现IView的视图

 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); } } } 

这是受测试的主持人：

 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MyPresenter的测试夹具：

 [TestClass] public class MyPresenterFixture() { private MyPresenter testee; private Mock mockView; [TestMethod] public void ShouldReactOnMyEvent() { // arrange this.mockView = new Mock(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()); } } 

我正在使用Moq 4.我可以做我想做的事吗？

最好的问候Yannik

Answer 1

你不需要通过论证吗？ 您的事件签名是EvenHandler，即
(object sender, EventArgs e) 。

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

我从来没有使用过你在这里指定的超载……但它似乎并不正确。

Answer 2

您已将UpdateView（）声明为接受字符串，但您的演示者调用没有字符串参数（或默认值）：

调用：

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

宣言：

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

validation：

 mockView.Verify(mock => mock.UpdateView(It.IsAny()); 

FWIW，我认为您认为该事件有点麻烦，一个简单的改变是：

 public interface IView { void UpdateText(string test); } public class MyPresenter { private readonly IView _view; public MyPresenter(IView view) { _view = view; } private void SelectItem(string item) { _view.UpdateText(item); } } public partial class MyView : IView { private readonly MyPresenter _presenter; public MyView() { _presenter = new MyPresenter(this); combo.SelectedIndexChanged += OnSelectedIndexChanged; } public void UpdateText(string test) { textBox.Text = test; } private OnSelectedIndexChanged(Object sender, EventArgs e) { _presenter.SelectItem(combo.SelectedItem); } } 

然后，您可以只validation与视图的交互，而无需处理其他事件：

  presenter.SelectItem("Burrito!"); mockView.Verify(mock => mock.UpdateView("Burrito!");