public void classes()
{
Document doc = NSoup.NSoupClient.Parse("<div><p class='mellow yellow'></p><p class='red green'></p>");
Elements els = doc.Select("p");
Assert.IsTrue(els.HasClass("red"));
Assert.IsFalse(els.HasClass("blue"));
els.AddClass("blue");
els.RemoveClass("yellow");
els.ToggleClass("mellow");
Assert.AreEqual("blue", els[0].ClassName());
Assert.AreEqual("red green blue mellow", els[1].ClassName());
}