Unit Testing a Repository services and form services using Mock

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MVC4

unit-testing

below is my repository service

public class ProductService : IProductService {

   private IProductRepository _productRepository;

   // Some initlization stuff

   public Product GetProduct(int id) {
      try {
         return _productRepository.GetProduct(id);
      } catch (Exception e) {
         // log, wrap then throw
      }
   }
}

and also i have a user defined form interface service as below:

 public interface IFormService
{
        Form GetFormById(int formId);
        Form GetFormByName(string formName);
        bool AddElement(FormElement form);
        bool AddForm(Form form);
}

now the constructor to the controller passes values as below:

public ProductController(IProductService productService , IFormService fwrepository)
        {
            this.productService = productService;
            this.fwrepository = fwrepository;
         }

how can i mock the two attributes while unit testing??
Please help