AsyncMediator.Test.MediatorTests.ExecuteDeferredEvents_WhenCalled_ShouldExecuteEventHandlersForEventsFiredInHandlers C# (CSharp) Method

        public async Task ExecuteDeferredEvents_WhenCalled_ShouldExecuteEventHandlersForEventsFiredInHandlers()
        {
            // Arrange
            var triggerEvent = new FakeEvent { Id = 1 };

            var handlerFactory = new MessageHandlerRegistry();
            var mediator = new Mediator(handlerFactory.MultiInstanceFactory, handlerFactory.SingleInstanceFactory);

            handlerFactory.AddHandlersForEvent(new List<IEventHandler<FakeEvent>>
            {
                new HandlerDeferringMultipleEvents(mediator),
                new HandlerDeferringSingleEvent(mediator),
                new HandlerWithoutAdditionalEvents()
            });

            handlerFactory.AddHandlersForEvent(new List<IEventHandler<FakeEventFromHandler>>
            {
                new DependentEventHandler()
            });

            handlerFactory.AddHandlersForEvent(new List<IEventHandler<FakeEventTwoFromHandler>>
            {
                _autoSubstitute.SubstituteFor<ChainedEventHandler>()
            });

            // Act
            mediator.DeferEvent(triggerEvent);
            await mediator.ExecuteDeferredEvents();

            // Assert
            foreach (var handler in handlerFactory.GetHandlersFor<FakeEventTwoFromHandler>())
            {
                handler.Received(1).Handle(Arg.Any<FakeEventTwoFromHandler>()).FireAndForget();
            }
        }