Question

I have the following interfaces. I’m not sure how I can use Moq to mock up an IRepository due to the fact that T is generic. I’m sure there’s a way, but I haven’t found anything through searching through here or google. Does anybody know how I can achieve this?

I’m fairly new to Moq, but can see the benefit of taking the time to learn it.

    /// <summary>
    /// This is a marker interface that indicates that an 
    /// Entity is an Aggregate Root.
    /// </summary>
    public interface IAggregateRoot
    {
    } 


/// <summary>
    /// Contract for Repositories. Entities that have repositories
    /// must be of type IAggregateRoot as only aggregate roots
    /// should have a repository in DDD.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public interface IRepository<T> where T : IAggregateRoot
    {
        T FindBy(int id);
        IList<T> FindAll();
        void Add(T item);
        void Remove(T item);
        void Remove(int id);
        void Update(T item);
        void Commit();
        void RollbackAllChanges();
    }

Answer 1

Shouldn’t be a problem at all:

public interface IAggregateRoot { }

class Test : IAggregateRoot { }

public interface IRepository<T> where T : IAggregateRoot
{
    // ...
    IList<T> FindAll();
    void Add(T item);
    // ...
 }

class Program
{
    static void Main(string[] args)
    {
        // create Mock
        var m = new Moq.Mock<IRepository<Test>>();

        // some examples
        m.Setup(r => r.Add(Moq.It.IsAny<Test>()));
        m.Setup(r => r.FindAll()).Returns(new List<Test>());
        m.VerifyAll();
    }
}