My comment on Ayende's queries v. abstractions

WithAbstractions.cs

   public void Index_should_return_the_best_selling_products(){
      var products = new [new Product()];
      var fakeService = new Mock<IHomeControllerWorkerServices>()
         .Setup(x=>x.GetBestSellingProductCategories())
         .Returns(products);
      // regular work...
      results.ShouldBeSameAs(products);
   }

WithoutAbstractions.cs

   public void Index_should_return_the_best_selling_products(){
      var products = // A BUNCH OF DATABASE SETUP TO REPLICATE THE SITUATION

      // regular work...
      results.ShouldContain(expectedProductA????); 
      results.ShouldContain(expectedProductB????);
      // have fun writing this assert...
   }