消费者在单元测试MassTransit时没有被调用

Question

我正在尝试使用MassTransit编写单元测试。 在线查看时，我发现访问总线的最佳方法是使用InMemoryTestHarness创建它。 我添加了我的使用者和一个PublishObserver来获得最终的行为。

在下面的示例中，我将TestRequest消息发送到总线，然后我的消费者读取请求并将TestResponse消息放回总线上。 最后，观察者得到了回应。

我不知道问题是否是我缺少的一些配置，或者如果有一些任务我不等待，但请求消息甚至从未到达消费者。

我错过了什么？

考试

[TestMethod]
public void RequestResponseBusTest()
{
    var harness = new InMemoryTestHarness();

    var consumer = new TestConsumer();
    harness.OnConfigureInMemoryBus += c =>
    {
        c.ReceiveEndpoint("testqueue", e =>
            e.Consumer(() => consumer));
    };

    var observer = new TestPublishObserver();
    harness.OnConnectObservers += c =>
    {
        c.ConnectPublishObserver(observer);
    };

    harness.Start().Wait();
    var bus = harness.Bus;

    bus.Publish(new TestRequest() { X = 99 }).Wait();

    Assert.AreEqual(1, consumer.ConsumedMessages.Count, "consumed");
    Assert.AreEqual(1, observer.PublishedRequests.Count, "requests");
    Assert.AreEqual(1, observer.PublishedResponses.Count, "responses");

}

和支持班

[Serializable]
public class TestRequest
{
    public int X { get; set; }
}

[Serializable]
public class TestResponse
{
    public int Y { get; set; }
}

public class TestConsumer : IConsumer<TestRequest>
{
    public List<TestRequest> ConsumedMessages { get; } = new List<TestRequest>();

    public Task Consume(ConsumeContext<TestRequest> context)
    {
        ConsumedMessages.Add(context.Message);
        context.Publish(new TestResponse() { Y = 123 }).Wait();
        return Task.CompletedTask;
    }
}

private class TestPublishObserver : IPublishObserver
{
    public List<TestRequest> PublishedRequests { get; } = new List<TestRequest>();
    public List<TestResponse> PublishedResponses { get; } = new List<TestResponse>();

    public Task PrePublish<T>(PublishContext<T> context) where T : class
    {
        return Task.CompletedTask;
    }

    public Task PostPublish<T>(PublishContext<T> context) where T : class
    {
        var msg = context.Message;

        if (msg is TestRequest)
            PublishedRequests.Add((TestRequest)(object)msg);

        if (msg is TestResponse)
            PublishedResponses.Add((TestResponse)(object)msg);

        return Task.CompletedTask;
    }

    public Task PublishFault<T>(PublishContext<T> context, Exception exception) where T : class
    {
        return Task.CompletedTask;
    }
}

Answer 1

你需要在bus.Publish之后添加Thread.Sleep（2000）（new TestRequest（）{X = 99}）。Wait（）; bus.Publish不保证邮件传递。 当您调用Wait（）方法时，您只需等待它被发送，而不是处理

要么！！！

[TestMethod]
public void RequestResponseBusTest()
{
    var harness = new InMemoryTestHarness();

    var consumer = new TestConsumer();
    harness.OnConfigureInMemoryBus += c =>
    {
        c.ReceiveEndpoint("testqueue", e =>
            e.Consumer(() => consumer));
    };

    var observer = new TestPublishObserver();
    harness.OnConnectObservers += c =>
    {
        c.ConnectPublishObserver(observer);
    };

    harness.Start().Wait();
    var bus = harness.Bus;

    bus.Publish(new TestRequest() { X = 99 }).Wait();

    //add this line
    var receivedMessage = harness.Consumed.Select<TestRequest>().FirstOrDefault();

    Assert.AreEqual(1, consumer.ConsumedMessages.Count, "consumed");
    Assert.AreEqual(1, observer.PublishedRequests.Count, "requests");
    Assert.AreEqual(1, observer.PublishedResponses.Count, "responses");

}