public EventConsumerGrainTests() { state.Position = initialPosition; consumerName = eventConsumer.GetType().Name; A.CallTo(() => eventStore.CreateSubscription(A <IEventSubscriber> .Ignored, A <string> .Ignored, A <string> .Ignored)) .Returns(eventSubscription); A.CallTo(() => eventConsumer.Name). Returns(consumerName); A.CallTo(() => stateHolder.State) .ReturnsLazily(() => state); A.CallToSet(() => stateHolder.State) .Invokes(new Action <EventConsumerState>(s => state = s)); A.CallTo(() => formatter.Parse(eventData, true)).Returns(envelope); sut = new MyEventConsumerGrain(formatter, eventStore, log); sutSubscriber = sut; sut.ActivateAsync(stateHolder).Wait(); }