classes which I use for testing ( ArmChair which is hopefully comming soon )

gistfile1.cs

/// <summary>
/// base for all domain object which use this Uow
/// </summary>
public abstract class EntityRoot
{
    public virtual int Id { get; protected set; }
}


public class Book : EntityRoot
{
    private readonly IList<Contributor> _contributors = new List<Contributor>();
    private readonly IList<Edition> _editions = new List<Edition>();

    protected Book()
    {

    }

    public Book(string title, Person author)
    {
        Title = title;
        _contributors.Add(new Contributor(author, ContributorType.Author));
    }

    public virtual void AddContributor(Person contributor, ContributorType contributorType)
    {
        if (_contributors.Any(x=> x.ContributorId == contributor.Id))
            return;

        _contributors.Add(new Contributor(contributor, contributorType));
    }

    public virtual void AddEdition(Edition edition)
    {
        if (_editions.Contains(edition))
        {
            _editions.Remove(edition);
        }
        _editions.Add(edition);
    }


    public virtual string Title { get; private set; }
    public virtual IEnumerable<Contributor> Contributors { get { return _contributors; } }
    public virtual IEnumerable<Edition> Editions { get { return _editions; } }
}

public enum ContributorType
{
    Author,
    CoAuthor,
    Editor
}

public enum EditionType
{
    HardBack,
    Paper,
    Electronic
}


public class Contributor
{
    protected Contributor()
    {
        
    }

    public Contributor(int id, string name, ContributorType contribution)
    {
        ContributorId = id;
        Name = name;
        Contribution = contribution;
    }

    public Contributor(Person person, ContributorType contribution) : this(person.Id, person.Name, contribution)
    {
      
    }

    public virtual string Name { get; private set; }
    public virtual ContributorType Contribution { get; private set; }
    public virtual int ContributorId { get; private set; }
}

public class Edition
{

    public Edition(string name, EditionType editionType)
    {
        Name = name;
        Type = editionType;

    }

    protected Edition()
    {
        
    }

    public virtual DateTime ReleaseDate { get; set; }
    public virtual string Name { get; private set; }
    public virtual EditionType Type { get; private set; }

    public override bool Equals(object obj)
    {
        var other = obj as Edition;
        if (other == null)
        {
            return false;
        }

        return other.GetHashCode() == GetHashCode();
    }

    public override int GetHashCode()
    {
        return Name.GetHashCode() + Type.GetHashCode(); ;
    }
}


public class Person : EntityRoot
{
    public Person(string name)
    {
        Name = name;
    }

    protected Person()
    {
        
    }

    public virtual string Name { get; set; }
}