public void PlusOneButton_Method()
        {
            Assert.Throws <ArgumentNullException>(() => IGoogleHtmlHelperExtensions.PlusOneButton(null, widget => { }));
            Assert.Throws <ArgumentNullException>(() => new GoogleHtmlHelper().PlusOneButton(null));

            Assert.Equal(new GoogleHtmlHelper().PlusOneButton().ToHtmlString(), new GoogleHtmlHelper().PlusOneButton(x => { }));
            Assert.Equal(new GoogleHtmlHelper().PlusOneButton().Url("url").ToHtmlString(), new GoogleHtmlHelper().PlusOneButton(x => x.Url("url")));
        }
        public void Analytics_Method()
        {
            Assert.Throws <ArgumentNullException>(() => IGoogleHtmlHelperExtensions.Analytics(null, widget => { }));
            Assert.Throws <ArgumentNullException>(() => new GoogleHtmlHelper().Analytics(null));

            Assert.Equal(new GoogleHtmlHelper().Analytics().ToHtmlString(), new GoogleHtmlHelper().Analytics(x => { }));
            Assert.Equal(new GoogleHtmlHelper().Analytics().Account("account").Domain("domain").ToHtmlString(), new GoogleHtmlHelper().Analytics(x => x.Account("account").Domain("domain")));
        }