Question

我是MassTransit和消息传递的新手。我正在尝试为IBus.Publish编写一个单元测试，但结果不能成功。

我正在观察RabbitMQ的错误，我的观察者看起来像这样：

public class FaultObserver : IReceiveObserver
{
    public FaultObserver(IRequestUpdater statusUpdater,Lazy<IBus> bus)
    {
        this.statusUpdater = statusUpdater;
        this.bus = bus;
    }

    public async Task ConsumeFault<T>(ConsumeContext<T> context, TimeSpan                                    duration, string consumerType, Exception exception) where T : class
    {
    }
 }

我的测试看起来像下面的代码

var bus = fixture.Freeze<Mock<IBus>>();

bus.Setup(bu => bu.Publish<ReportFailedEvent>(It.IsAny<ReportFailedEvent>(),It.IsAny<CancellationToken>())).Verifiable();

var sut = fixture.Create<ReportRequestedFaultObserver>();
// Act
await sut.ConsumeFault(context.Object,new TimeSpan(0,0,1),string.Empty,exception);

// Assert
//bus.Verify(b => b.Publish<ReportFailedEvent>(It.IsAny<ReportFailedEvent>(), It.IsAny<CancellationToken>()), Times.Exactly(1));
bus.Verify(b =>b.Publish<ReportFailedEvent>(new ReportFailedEvent(request,exception.Message),It.IsAny<CancellationToken>()),Times.Once());

我的设置看起来像

[SetUp]
public void SetUp()
{
    fixture.Customize(new AutoMoqCustomization());
    var inMemoryTransportCache = new InMemoryTransportCache(Environment.ProcessorCount);

    bus = Bus.Factory.CreateUsingInMemory(configure =>
    {
        configure.SetTransportProvider(inMemoryTransportCache);
        configure.ReceiveEndpoint("input_queue", configurator => 
        { 
            configurator.Handler<(cc => 
            {
            });
        }); 

    });

    bus.Start().Ready.Wait();
}

我无法模仿我的Publish方法。有谁知道我做错了什么？

Answer 1

您的公交模拟车是错误的。应该是：

bus.Setup(bu => bu.Publish<ReportFailedEvent>(
    It.IsAny<object>(), It.IsAny<CancellationToken>()));

按照MassTransit中的接口定义，发布采用object和CancellationToken：

Task Publish(object message, CancellationToken cancellationToken = default(CancellationToken));

此外，如果要检查邮件的内容，可以使用Moq Callback扩展名：

ReportFailedEvent message = null;
bus
  .Setup(bu => bu.Publish<ReportFailedEvent>(It.IsAny<object>(), It.IsAny<CancellationToken>()))
  .Callback<object, CancellationToken>((a, b) => { message = a as ReportFailedEvent; });

//.. your system under test code....

Assert.That(message.Property, Is.EqualTo(expectation));

如果要设置优先级，MassTransit界面如下所示：

public static Task Publish<T>(
      this IPublishEndpoint endpoint,
      T message,
      Action<PublishContext<T>> callback,
      CancellationToken cancellationToken = default(CancellationToken))
      where T : class;

一个例子是：

bus.Publish<ReportFailedEvent>(message, context =>
{
    context.SetPriority(messagePriority.Priority);
});

随附的起订量为：

ReportFailedEvent message = null;
bus
  .Setup(bu => bu.Publish<ReportFailedEvent>(It.IsAny<object>(), It.IaAny<Action<PublishContext<ReportFailedEvent>>>(), It.IsAny<CancellationToken>()))
  .Callback<object, Action<PublishContext<ReportFailedEvent>>, CancellationToken>((a, b, c) => { message = a as ReportFailedEvent; });

请注意，理想情况下，您应该发布接口而不是类，所以用IReportFailedEvent而不是ReportFailedEvent。

使用内存总线对公共交通中的发布方法进行单元测试

1 个答案: