如何在单元测试中比较视图模型和依赖项

下面是我的方法的代码：-

   [HttpPost]
   public ActionResult Index(productViewModel model)
   {
       if (model != null)
       {             
           return PartialView("_ProductGrid", GetProduct(model));
       }
       else
       {
           return RedirectToAction("Index", "Product");
       }
   }

下面是单元测试方法的代码（在C#，MVC中）：-

    [TestMethod]
    public void Index_WithModel_PostTest()
    {
        //Arrange
        ProductController controller = new ProductController();
        var model = new productViewModel()
        {
            Name="product1",
            Description="desc"
        };

        //Act
        PartialViewResult actual = controller.Index(model) as PartialViewResult;                       
        if (actual != null)
        {
            var viewmodel = (productViewModel)((ViewResultBase)(actual)).Model;
            int matches = _productService.GetDeals("", model.Description).Count +
                          _productService.GetInsurance("", model.Description).Count +
                          _productService.GetCategory("", model.Description).Count;

            //Assert
            Assert.IsNotNull(actual);
            Assert.IsInstanceOfType(actual, typeof(PartialViewResult));
            Assert.IsInstanceOfType(viewmodel, typeof(productViewModel));
            Assert.AreEqual("_ProductGrid", actual.ViewName);
            Assert.AreEqual(matches, viewmodel.Products.Count());
        }
    }

您可以在该方法的以下部分看到，我正在从所有 3 种方法中获取Products。但是所有这 3 种方法都是ProductService依赖关系。我想知道我应该mock这种情况吗？或者我可以用其他方式做？我想Assert匹配变量和actual.Product.Count的count。