How to get feedback from saga handler using NServiceBus Acceptance Testing

Question

Background

I have written a test that makes sure that the command that should start my saga effectively creates the saga and that it's handler code can be executed:

[Fact]
public async Task Can_Start_Saga_And_Execute_Handler()
{
    var result = await Scenario
        .Define<Context>()
        .WithEndpoint<Endpoint>(b => b.When(session =>
            {
                return session.SendLocal(new SagaStarter());
            })
        )
        .Done(context => context.IsRequested)
        .Run(Testing.MaxRunTime);

    result.IsRequested.ShouldBeTrue();
}

Where Context is:

class Context : ScenarioContext
{
    public bool IsRequested { get; set; }
}

So

If I have a handler in my saga definition like so:

public async Task Handle(SagaStarter message, IMessageHandlerContext context)
{
    await StuffToDo();
}

How can I ensure that the IsRequested property, defined in Context, is set to true from within the saga?

Answer 1

I've found a solution, adding an extra message handler in the test like so:

public class TestHandler : IHandleMessages<SagaStarter>
{
    private Context _testContext;

    public TestHandler(Context testContext)
    {
        _testContext = testContext;
    }

    public Task Handle(SagaStarter message, IMessageHandlerContext context)
    {
        _testContext.IsRequested= true;
        return Task.CompletedTask;
    }
}

The Context parameter is inserted through Dependency Injection.