卡利EventAggregator MOQ验证PublishOnUIThreadAsync异步方法
问题描述:
我有一个事件如下卡利EventAggregator MOQ验证PublishOnUIThreadAsync异步方法
namespace MyProject
{
public class MyEvent
{
public MyEvent(int favoriteNumber)
{
this.FavoriteNumber = favoriteNumber;
}
public int FavoriteNumber { get; private set; }
}
}
我具有引发此事件的方法。
using Caliburn.Micro;
//please assume the rest like initializing etc.
namespace MyProject
{
private IEventAggregator eventAggregator;
public void Navigate()
{
eventAggregator.PublishOnUIThreadAsync(new MyEvent(5));
}
}
如果我只使用PublishOnUIThread,下面的代码(在一个单元测试)工作正常。
eventAggregatorMock.Verify(item => item.Publish(It.IsAny<MyEvent>(), Execute.OnUIThread), Times.Once);
但是我该如何检查异步版本?
eventAggregatorMock.Verify(item => item.Publish(It.IsAny<MyEvent>(), Execute.OnUIThreadAsync), Times.Once);
面临验证异步方法的麻烦。假设private Mock<IEventAggregator> eventAggregatorMock;
。部分Execute.OnUIThreadAsync
给出错误'Task Execute.OnUIThreadAsync' has the wrong return type
。
我也试过
eventAggregatorMock.Verify(item => item.Publish(It.IsAny<MyEvent>(), action => Execute.OnUIThreadAsync(action)), Times.Once);
,但是他说,System.NotSupportedException: Unsupported expression: action => action.OnUIThreadAsync()
在此先感谢。
答
IEvenAggregator.Publish
被定义为
void Publish(object message, Action<System.Action> marshal);
因此,你需要提供正确的表达式匹配的定义。
eventAggregatorMock.Verify(_ => _.Publish(It.IsAny<MyEvent>(),
It.IsAny<Action<System.Action>>()), Times.Once);
而且PublishOnUIThreadAsync
扩展方法返回一个任务
/// <summary>
/// Publishes a message on the UI thread asynchrone.
/// </summary>
/// <param name="eventAggregator">The event aggregator.</param>
/// <param name="message">The message instance.</param>
public static Task PublishOnUIThreadAsync(this IEventAggregator eventAggregator, object message) {
Task task = null;
eventAggregator.Publish(message, action => task = action.OnUIThreadAsync());
return task;
}
所以应该等待
public async Task Navigate() {
await eventAggregator.PublishOnUIThreadAsync(new MyEvent(5));
}
仅供参考,它的工作,而无需修改方法为你规定。如果我试图“等待”它,我得到'System.NullReferenceException:对象引用未设置为对象的实例。' –
@HussainMir这是因为没有设置将返回任务,因此它是空的。 https://github.com/Caliburn-Micro/Caliburn.Micro/blob/master/src/Caliburn.Micro/Execute.cs#L30 – Nkosi
嗨,我试过这个'MyEvent navigateEvent = null; eventAggregatorMock.Setup(x => x.Publish(It.IsAny(),It.IsAny >()))。回调