상속: IDomainEventSubscriber
		public void Subscribe_DomainEventSubscriber_Adds_DomainEventSubscriber()
		{
			//arrange
			var publisher = new DomainEventPublisher();
			Action<DomainEvent> handle = domainEvent => { };
			var domainEventSubscriber = new DomainEventSubscriber(handle, typeof(DomainEvent));

			//act
			publisher.Subscribe(domainEventSubscriber);
			
			//assert
		}
        public void Subscribe <TEvent>(Action <DomainEvent> handle) where TEvent : DomainEvent
        {
            var subscriber = new DomainEventSubscriber(handle, typeof(TEvent));

            Subscribe(subscriber);
        }