public void Can_use_delegate_to_subscribe_to_message()
        {
            var         eventAggregator = new EventAggregator();
            SomeMessage messageTrapped  = null;

            eventAggregator.AddListenerAction <SomeMessage>(msg => { messageTrapped = msg; });
            eventAggregator.SendMessage <SomeMessage>();

            messageTrapped.ShouldNotBeNull();
        }