public void apply_event()
{
_stream.Setup(x => x.Add(Moq.It.IsAny <IEvent>(), Moq.It.IsAny <IDictionary <string, string> >()));
_entity.ApplyEvent();
_stream.Verify(x => x.Add(Moq.It.IsAny <IEvent>(), Moq.It.IsAny <IDictionary <string, string> >()), Moq.Times.Once);
}
