@Override
                    public int differenceFound(Difference difference) {
                        String value = difference.getControlNodeDetail().getValue();
                        String tvalue = null;
                        if (difference.getControlNodeDetail().getNode() != null) {
                            tvalue = difference.getControlNodeDetail().getNode().getTextContent();
                        }
                        if ("*".equals(value) || "*".equals(tvalue)) {
                            return RETURN_IGNORE_DIFFERENCE_NODES_IDENTICAL;
                        } else {
                            return RETURN_ACCEPT_DIFFERENCE;
                        }
                    }
The payload is expected to be XML. Parse it and then use XmlUnit to compare the payload
with the expected payload (obviously also XML).

@param restTest
@param response
test/common/src/main/java/io/apiman/test/common/util/TestPlanRunner.java