Unit testing with ASP.NET MVC model binders

[AcceptVerbs(HttpVerbs.Get)]
public ActionResult AddProduct(Product product)
{
}

public void Catalog_AddProduct()
{
    CatalogController controller = new CatalogController();
    // some mocking for controller context, setting form values etc...
    controller.AddProduct(// ?);
}

[TestMethod()]
public void AddProductTest()
{
    CatalogController target = new CatalogController(/*testing variables*/);
    target.AddProduct(new Product { /* product details for testing */ });

    // Test the results
}