Akka.net 尽管有 ActorInitializationException 异常,但 Testkit 不会将测试用例标记为失败

Akka.net Testkit does not mark test case failed despite ActorInitializationException exception

以下是演员,我已经定义(试图让我的头脑围绕坚持不懈的演员!!)

public class Country : ReceivePersistentActor
{
    public override string PersistenceId => GetType().Name + state.Id;

    private CountryState state;

    public Country()
    {
        Command<CreateCountry>(CreateCountry);
    }

    private bool CreateCountry(CreateCountry cmd)
    {
        Persist(new CountryCeated
        {
            Id = cmd.Id,
            Code = cmd.Code,
            Description = cmd.Description,
            Active = cmd.Active
        }, evt =>
        {
            state = new CountryState
            {
                Id = evt.Id,
                Code = evt.Code,
                Description = evt.Description,
                Active = evt.Active
            };
        });

        return true;
    }
}

以下是我定义的单元测试用例:

[TestClass]
public class CountrySpec : TestKit
{
    [TestMethod]
    public void CountryActor_Should_Create_A_Country()
    {
        var country = Sys.ActorOf(Props.Create(() => new Country()), "Country");
        country.Tell(new CreateCountry(Guid.NewGuid(), "UK", "United Kingdom", true));
        ExpectNoMsg();
    }
}

当我运行测试用例时,我可以在测试用例window的输出中看到一个异常

[ERROR][25/08/2016 08:25:07][Thread 0007][akka://test/user/Country] Object reference not set to an instance of an object.
Cause: [akka://test/user/Country#552449332]: Akka.Actor.ActorInitializationException: Exception during creation ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at Domain.Country.get_PersistenceId() in Y:\Spikes\StatefulActors\Domain\Country.cs:line 9
   at Akka.Persistence.Eventsourced.StartRecovery(Recovery recovery)
   at Akka.Persistence.Eventsourced.AroundPreStart()
   at Akka.Actor.ActorCell.<>c__DisplayClass154_0.<Create>b__0()
   at Akka.Actor.ActorCell.UseThreadContext(Action action)
   at Akka.Actor.ActorCell.Create(Exception failure)
   --- End of inner exception stack trace ---
   at Akka.Actor.ActorCell.Create(Exception failure)
   at Akka.Actor.ActorCell.SysMsgInvokeAll(EarliestFirstSystemMessageList messages, Int32 currentState)

但是测试用例被标记为成功

TestKit中有没有way/settings,可以设置任何异常,标记测试用例失败?

默认情况下,actors 内部的任何异常都被封装了——这意味着它们不会冒泡,从而破坏系统的其余部分。

演员进入系统,可以通过观察他们相互交流的方式来测试。通常它会提供输入并断言演员系统的输出 - 在您的案例中测试已通过,因为您尚未验证任何输出。从你测试的角度来看,这个演员可能已经死了,这不会有什么不同。

验证输出(通过 actor 本身内部的断言或即使用自定义测试日志)是使用测试的最佳方式。

如果出于某种原因您仍然需要捕获参与者内部的异常,您可以创建绑定到 TestActor 的监督策略,其中可以转发所有异常:

public class TestingStrategy : OneForOneStrategy
{
    protected TestingStrategy(IActorRef probe) : base(exception =>
    {
        probe.Tell(exception);
        return DefaultDecider.Decide(exception);
    }) { }
}