public void Make_readonly()
        {
            var h = new HtmlAttributes(@class => "class1");

            h.Readonly();

            Assert.That(h.ToHtmlString(), Is.EqualTo(" class=\"class1\" readonly=\"readonly\""));
        }
        public void Not_make_readonly_when_guard_is_false()
        {
            var h = new HtmlAttributes(@class => "class1");

            h.Readonly(false);

            Assert.That(h.ToHtmlString(), Is.EqualTo(" class=\"class1\""));
        }