public void Enqueue_CallsEnqueueWithTheDomainEvent_WithTheDomainEventAsParameter()
{
// Arrange
IMessageQueueProducer <IDomainEvent> producer = Substitute.For <IMessageQueueProducer <IDomainEvent> >();
DomainEvent domainEvent = new ConcreteDomainEvent(producer);
// Act
domainEvent.Enqueue();
// Assert
producer.Received(1).Enqueue(Arg.Any <ConcreteDomainEvent>());
}