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Caliburn EventAggregator moq verify PublishOnUIThreadAsync异步方法

caliburn.micro moq asynchronous unit-testing .net

Hussain Mir · 技术社区 · 7 年前

namespace MyProject
{
    public class MyEvent
    {
        public MyEvent(int favoriteNumber)
        {
            this.FavoriteNumber = favoriteNumber;
        }

        public int FavoriteNumber { get; private set; }
    }
}

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(在单元测试中)运行良好。

eventAggregatorMock.Verify(item => item.Publish(It.IsAny<MyEvent>(), Execute.OnUIThread), Times.Once);

但我如何检查相同的异步版本?

eventAggregatorMock.Verify(item => item.Publish(It.IsAny<MyEvent>(), Execute.OnUIThreadAsync), Times.Once);

验证异步方法时遇到问题。假定 private Mock<IEventAggregator> eventAggregatorMock; . 角色 Execute.OnUIThreadAsync 给出错误 'Task Execute.OnUIThreadAsync' has the wrong return type .

eventAggregatorMock.Verify(item => item.Publish(It.IsAny<MyEvent>(), action => Execute.OnUIThreadAsync(action)), Times.Once);

但是说, System.NotSupportedException: Unsupported expression: action => action.OnUIThreadAsync()

提前谢谢。

1 回复 | 直到 7 年前

Nkosi 7 年前

IEvenAggregator.Publish 定义为

void Publish(object message, Action<System.Action> marshal);

因此,您需要提供一个合适的表达式来匹配该定义。

eventAggregatorMock.Verify(_ => _.Publish(It.IsAny<MyEvent>(), 
                                It.IsAny<Action<System.Action>>()), Times.Once);

PublishOnUIThreadAsync 扩展方法返回任务

/// <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));
}

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