C# Akka.Net 单元测试哪个内置断言等待发布的消息是正确的？

Question

我需要一些支持才能理解如何成功等待从 actor Receive 块中发送的预期响应消息。

以下示例与我目前在网上找到的不同，因为我使用了 Akka.Cluster / Akka.Cluster.Tools 发布消息而不是直接将消息发送回“Sender.Tell()”给发件人。

问题：如何在我的单元测试中获取、订阅此 已发布 SomeResponse 消息？

public class SomeRequest { }
public class SomeResponse { }
public class MyDbTestActor : ReceiveActor
{
    private readonly IActorRef _mediator;

    public MyDbTestActor()
    {
        // ...
        _mediator = DistributedPubSub.Get(Context.System).Mediator;
        // ...
        Receive<SomeRequest>(o =>
        {
            // ...
            var response = new SomeResponse();
            _mediator.Tell(new Publish(Global.MYTopic, response)); // <-- ExpectMsg timeout ...
            
            //Sender.Tell(response); // if uncommented ExpectMsg is succeed.
        });
    }
}
class Global
{
    public static string MYTopic =nameof(MYTopic);
}
public class SomeActorTests : TestKit
{
    [Fact]
    public void SomeTest()
    {
        var actor = Sys.ActorOf(Props.Create<MyDbTestActor>());

        actor.Tell(new SomeRequest());
        
        ExpectMsg<SomeResponse>();
    }
}

Answer 1

我想让 TestActor 从 DistributedPubSub 调解员那里订阅该主题：

public class SomeActorTests: TestKit
{
    private IActorRef _mediator;
    private string path;

    // pass in an Akka.Cluster config that performs a self-join, etc
    public SomeActorTests(Config config, ITestOutputHelper output) : base(config, output:output)
    {
        _mediator = DistributedPubSub.Get(Sys).Mediator;
    }

    [Fact]
    public void SomeTest()
    {

        // arrange
        var actor = Sys.ActorOf(Props.Create<MyDbTestActor>());
        _mediator.Tell(new Subscribe(Global.MYTopic, TestActor));
        ExpectMsg<SubscribeAck>(); // subscription confirmed

        // act
        actor.Tell(new SomeRequest());
        
        // assert
        ExpectMsg<SomeResponse>();
    }
}

这将使用 Mediator 将您的演员和 TestActor 连接在一起来关闭电路。

C# Akka.Net 单元测试哪个内置断言等待发布的消息是正确的？

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