unit-testing - MassTransit 服务总线配置和单元测试

Question

对于 MassTransit，在设置新服务总线时必须声明端点/类型；但是，我正在尝试删除该依赖项，以便在对消费者进行测试时，我可以利用环回端点，但一旦投入生产，它将使用实际的 msmq 端点。

下面是一个新服务总线的示例设置:

public class ConsumerService
{
    IServiceBus _bus;

    public void Start()
    {
        // Initalize Service Bus
        _bus = ServiceBusFactory.New(x =>
        {
            //x.UseMsmq();
            x.ReceiveFrom("loopback://localhost/MyQueue");
            x.SetConcurrentConsumerLimit(1);
        });
        _bus.SubscribeConsumer(() => new MyConsumer());
    }

    public void Stop()
    {
        _bus.Dispose();
    }
}

Answer 1

使用构造函数注入(inject):

public class ConsumerService
{
    private readonly IBusInitializer initializer;

    public ConsumerService(IBusInitializer initializer)
    {
        this.initializer = initializer;
    }

    IServiceBus _bus;

    public void Start()
    {
        // Initalize Service Bus
        _bus = ServiceBusFactory.New(x =>
        {
            this.initializer.initialize(x);
            x.SetConcurrentConsumerLimit(1);
        });
        _bus.SubscribeConsumer(() => new MyConsumer());
    }

    public void Stop()
    {
        _bus.Dispose();
    }
}

其中 IInitializer 是一个正确定义的接口(interface)，实现可以是:

public class LoopbackInitializer : IBusInitializer
{
    public void Initialize(WhateverXIs x)
    {
        x.ReceiveFrom("loopback://localhost/MyQueue");
    }
}

public class MsmqInitializer : IBusInitializer
{
    public void Initialize(WhateverXIs x)
    {
        x.UseMsmq();
    }
}

在您的测试或 Composition Root 中注入(inject)所需的实现.