Tests Product Service
ProductXMLClient client = new ProductXMLClient();
Element product = client.getProduct("A358185");
DOM2Writer domWriter = new DOM2Writer();
String xml = domWriter.nodeToString(product);
assertEquals ("<product sku=\"A358185\"><name>Red Hat Linux</name>"+
"<description>Red Hat Linux Operating System</description><price>54.99</price></product>",
xml);