ShoppingCart.Spec.cs

public class when_adding_a_cart_item 
{
    Because customer_service_and_our_customer_journey_tracker_needs_trace_info 
                = () => shoppingCart.AddCartItem(cartItem);

    It sends_the_correct_message_to_the_event_aggregator 
                = () => MessageHandler.Messages.ShouldContain(message => 
                            message.type == CustomerActiom.CartItemAddedToCart);
}