public void GetHashCode_should_be_the_state_hashcode()
{
var id = ParentEntityId.Generate();
var state = new ParentState().Apply(new ParentCreated(id, "test parent", DateTime.UtcNow));
var parent = new ParentEntity(Enumerable.Empty <IEvent>(), state);
parent.GetHashCode().Should().Be(parent.StateModel.GetHashCode());
}