public void RoundTripXml()
{
const string XmlFormat = "<xml>{0}</xml>";
string original = string.Format(XmlFormat, Guid.NewGuid());
Guid id = source.InsertXml(original);
Assert.AreNotEqual <Guid>(Guid.Empty, id);
var returned = source.SelectXml(id);
Assert.IsNotNull(returned);
Assert.AreEqual <string>(original, returned, "Data Mismatch");
string update = string.Format(XmlFormat, Guid.NewGuid());
source.UpdateXml(id, update);
var finalData = source.SelectXml(id);
Assert.IsNotNull(finalData);
Assert.AreEqual <string>(update, finalData, "Data Mismatch");
}