public void TestLastElement()
{
var element1 = new HElement("div", "Content");
var element2 = new HElement("div", "Content2");
var elements = new HElement[] { element1, element2, null };
Assert.Same(element2, elements.LastElement().Single());
elements = new HElement[] { null };
Assert.Equal(0, elements.LastElement().Count());
elements = null;
Assert.Equal(0, elements.LastElement().Count());
}