public void ExampleSentenceFinder_SingleIdenticalForm_FindsIt()
        {
            string ancestor =
                @"<?xml version='1.0' encoding='utf-8'?>
            <sense id='123'>
             <example>
            <form lang='chorus'>
              <text>This is my example sentence.</text>
            </form>
              </example>
            </sense>";

            var dom = new XmlDocument();
            dom.LoadXml(ancestor);
            var parent = dom.SelectSingleNode("//sense");
            var guyToMatch = dom.SelectSingleNode("//example");
            var finder = new ExampleSentenceFinder();
            var match = finder.GetNodeToMerge(guyToMatch, parent, SetFromChildren.Get(parent));
            Assert.AreEqual(guyToMatch.OuterXml, match.OuterXml);
        }