public void FirstLast()
{
var range = XElement.Parse(xml);
var cdata = range.DescendantNodes()
.Where(e => e.NodeType == XmlNodeType.CDATA)
.First() as XCData;
var phrase = new Phrase(cdata);
Assert.IsNotNull(phrase);
Assert.IsFalse(phrase.IsEmpty);
Assert.IsTrue(phrase.ContainsMultipleWords);
Assert.IsFalse(phrase.StartsWithSpace);
Assert.IsFalse(phrase.EndsWithSpace);
var word = phrase.ExtractFirstWord();
Assert.IsNotNull(word);
Assert.AreEqual("One ", word);
word = phrase.ExtractFirstWord();
Assert.IsNotNull(word);
Assert.AreEqual("two ", word);
word = phrase.ExtractLastWord();
Assert.IsNotNull(word);
Assert.AreEqual(" four", word);
word = phrase.ExtractLastWord();
Assert.IsNotNull(word);
Assert.AreEqual("three", word);
word = phrase.ExtractLastWord();
Assert.IsNotNull(word);
Assert.AreEqual(string.Empty, word);
}