asp.net mvc3 UnitOfWork unit test help

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ASP.NET

MVC3

unit-testing

Hi,

I have a unit of work class which is as below:

public class UnitOfWork : IUnitOfWork, IDisposable
    {
        private readonly EFDbContext context;
        private IGenericRepository<Category> _categoryRepository;
        private IGenericRepository<Product> _productRepository;


        #region Contructor
        public UnitOfWork()
        {
            context = new EFDbContext();
        }
        #endregion

        public IGenericRepository<Category> CategoryRepository
        {
            get
            {
                if (_categoryRepository == null)
                {
                  _categoryRepository = new EFGenericRepository<Category>(context);
                }
                return _categoryRepository;
            }
        }

        public IGenericRepository<Product> ProductRepository
        {
            get
            {
                if (_productRepository == null)
                {
                    _productRepository = new EFGenericRepository<Product>(context);
                }
                return _productRepository;
            }
        }

        // Save.. Dispose etc omitted
    }// end of class

I defined a new Interface, IPriceIncreaser. Purpose: Increase prices of all products in Product inventory

public class PriceIncreaser : IPriceIncreaser
    {
        private IUnitOfWork unitOfWork;

        public PriceIncreaser(IUnitOfWork unitOfWorkParam)
        {
            unitOfWork = unitOfWorkParam;
        }

        public void IncreasePrice(decimal increaseAmount)
        {
            foreach (Product p in unitOfWork.ProductRepository.Get())
            {
                p.Price += increaseAmount;
            }
        }
    }

Now, i want to unit test my repo, using Moq as the unit testing framework.

I've written the following unit test:

[TestMethod]
        public void Can_Increase_Prices()
        {
           

            var mockProductRepo = new Mock<IGenericRepository<Product>>();
            mockProductRepo.Object.Insert(new Product { Name = "MP", Description  ="HI", Price = 2500 });
             
            // mock Unit of work here...
           

            decimal initalProductTotalPrice = mockUnitOfWork.Object.ProductRepository.Get().Sum(p => p.Price);

            decimal increaseAmount = 55;

            // Act:
            PriceIncreaser target = new PriceIncreaser(mockUnitOfWork.Object);
            target.IncreasePrice(increaseAmount);

            // Assert
            Assert.AreNotEqual(initalProductTotalPrice, mockUnitOfWork.Object.ProductRepository.Get().Sum(p => p.Price));
        }

But i'm getting an error when i run the test which says:

Cannot override Non-Virtual member ...ProductRepository

I realize from reading other threads that Moq will only mock Interfaces, and abstract methods/fields.

I want to know how i can now write a unit test, which mocks my Product repository, which is of type IGenericRepository<Product> contained within UnitOfWork.ProductRepository and UnitOfWork is-a IUnitOfWork.

Any and all suggestions appreciated.

Thanks.