public void Add_new_attribute()
{
var h = new HtmlAttributes(href => "http://url/");
h.Attr("data-value", "val");
Assert.That(h.ToHtmlString(), Is.EqualTo(" data-value=\"val\" href=\"http://url/\""));
}
public void Replace_existing_attribute()
{
var h = new HtmlAttributes(href => "http://url/");
h.Attr("href", "newhref");
Assert.That(h.ToHtmlString(), Is.EqualTo(" href=\"newhref\""));
}