GuidedDTGraphXMLPersistence { public static GuidedDTGraphXMLPersistence getInstance() { return INSTANCE; } private  GuidedDTGraphXMLPersistence(); static GuidedDTGraphXMLPersistence getInstance(); String marshal( final GuidedDecisionTableEditorGraphModel content ); GuidedDecisionTableEditorGraphModel unmarshal( final String xml );  }
@Test public void checkInstanceIdentity() { final GuidedDTGraphXMLPersistence s1 = GuidedDTGraphXMLPersistence.getInstance(); final GuidedDTGraphXMLPersistence s2 = GuidedDTGraphXMLPersistence.getInstance(); assertEquals( s1, s2 ); }