public void write_value()
        {
            var xmlInput = new XmlFormatterModel()
            {
                FirstName = "Jeremy",
                LastName  = "Miller"
            };

            theFormatter.Write(xmlInput, "text/xml");

            streamingData.CopyOutputToInputForTesting(writer.OutputStream());

            var xmlOutput = theFormatter.Read <XmlFormatterModel>();

            xmlOutput.ShouldNotBeTheSameAs(xmlInput);

            xmlOutput.FirstName.ShouldEqual(xmlInput.FirstName);
            xmlOutput.LastName.ShouldEqual(xmlInput.LastName);
        }