public void TestRemoveClassAll()
{
var elements = new HElement[] {
new HElement("p", "First paragraph."),
null,
new HElement("p", new HAttribute("class", "selected class3"), "Second paragraph is selected.")
};
elements.RemoveClass();
Assert.Null(elements[0].Attribute("class"));
Assert.Null(elements[2].Attribute("class"));
}