public void WSpinButton()
        {
            var hh = new FakeHtmlHelper<Foo>();
            hh.ViewData.Model = new Foo
            {
                Price = 10
            };

            var html = hh.WSpinButton("Nome");
            Assert.AreEqual("<input class=\"wspinbutton\" id=\"Nome\" name=\"Nome\" type=\"text\" value=\"\" />", html.ToHtmlString());

            html = hh.WSpinButton("Nome", "Valor");
            Assert.AreEqual("<input class=\"wspinbutton\" id=\"Nome\" name=\"Nome\" type=\"text\" value=\"Valor\" />", html.ToHtmlString());

            html = hh.WSpinButtonFor(m => m.Price);
            Assert.AreEqual("<input class=\"wspinbutton\" id=\"Price\" name=\"Price\" type=\"text\" value=\"10\" />", html.ToHtmlString());

            html = hh.WSpinButtonFor(m => m.Price, new { @class = "testClass1 testClass2" });
            Assert.AreEqual("<input class=\"testClass1 testClass2 wspinbutton\" id=\"Price\" name=\"Price\" type=\"text\" value=\"10\" />", html.ToHtmlString());
        }