In response to questions from this blog post: https://blog.robseder.com/2016/01/29/new-github-and-nuget-package-division42-data-repository-entityframework/#comments

Customer.cs

public class Customer
{
    [Key]
    public Guid CustomerId { get; set; }

    public String FirstName { get; set; }
    public String LastName { get; set; }
}

CustomerController.cs

public class CustomerController : ApiController
{
    /// <summary>
    /// Creates a new instance of this type. (Production use)
    /// </summary>
    public CustomerController() : this(new CustomerRepository())
    {
    }

    /// <summary>
    /// Creates a new instance of this type. (Unit testing use)
    /// </summary>
    /// <param name="repository"></param>
    public CustomerController(IRepository<Customer> repository)
    {
        Repository = repository;
        if (repository == null)
            throw new ArgumentNullException("repository");
    }

    public IRepository<Customer> Repository { get; private set; }

    public IHttpActionResult Get()
    {
        try
        {
            // I have NO IDEA if this is a real database repository
            // or an in-memory one from unit testing.
            IEnumerable<Customer> model = Repository.GetAll();

            return Ok(model);
        }
        catch (Exception exception)
        {
            return InternalServerError(exception);
        }
    }
}

CustomerRepository.cs

// using Division42.Data.Repository.EntityFramework;
public class CustomerRepository :
    EntityFrameworkRepositoryBase<Customer>
{
    /// <summary>
    /// Creates a new instance of this type. (Production use)
    /// </summary>
    public CustomerRepository() : this(new PointOfSaleContext())
    {
    }

    /// <summary>
    /// Creates a new instance of this type. (Unit testing use)
    /// </summary>
    /// <param name="context"></param>
    public CustomerRepository(DbContext context) : base(context)
    {
    }

    public override Customer GetById(Guid id, params string[] entityIncludes)
    {
        // using System.Data.Entity.Infrastructure;
        DbQuery<Customer> query = this.Entities;
        if (entityIncludes != null)
        {
            foreach (String entityInclude in entityIncludes)
            {
                query = query.Include(entityInclude);
            }
        }

        return query.FirstOrDefault(item => item.CustomerId == id);
    }
}