Question

class A
{
    event EventHandler Event1;
}
var mock = new Mock<A>();

如何验证Event1被解雇？（不使用手动事件处理程序/触发标志）

Answer 1

var mock = new Mock<IInterfaceWithEvent>;
mock.Raise(e => e.MyEvent += null, EventArgs.Empty);
mock.VerifyAll();

或者如果您想确保该行为引发事件，您的设置应如下所示：

mock.Setup(foo => foo.Submit()).Raises(f => f.Sent += null, EventArgs.Empty);
// ...
mock.VerifyAll();

Answer 2

我不确定我真的明白你为什么这么问。如果您有一个Mock<A>，那么您可以控制模拟，以便验证它是否已经完成了您控制的操作？

那就是说，虽然我确实使用了Moq的加注/加注，但我仍然经常使用带有lambda的标志，我觉得相当干净：

bool eventWasDispatched = false; // yeah, it's the default
var a = new A();
a.Event1 += () => eventWasDispatched = true;
a.DoSomethingToFireEvent();
Assert.IsTrue(eventWasDispatched);

Answer 3

这样的事情怎么样？

public class MyClass : INotifyPropertyChanged
{
    private string _name;
    public string Name
    {
        get => _name;

        set
        {
            _name = value;
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Name)));
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;
}

在您的测试中：

// This interface contains signatures which match your event delegates
public interface IPropertyChangedEventHandler
{
    void PropertyChangedHandler(object sender, PropertyChangedEventArgs e);
}

public void WhenSettingNameNotifyPropertyChangedShouldBeTriggered()
{
    // Arrange
    var sut = new Mock<MyClass>();

    var handler = new Mock<IPropertyChangedEventHandler>();
    handler.Setup(o => o.PropertyChangedHandler(sut, new PropertyChangedEventArgs(nameof(MyClass.Name))));

    sut.PropertyChanged += handlerMock.Object.PropertyChangedHandler;

    // Act
    sut.Name = "Guy Smiley";

    // Assert
    handler.Verify();
}

Moq验证事件已触发

3 个答案: