DatasetGraphAccessor updater = getDatasetUpdater() ;
//updater.httpDelete(n1) ;
Graph graph = updater.httpGet(n1) ;
assertNullOrEmpty(graph) ;
updater.httpPut(graph2) ;
updater.httpPut(n1, graph1) ;
updater.httpDelete() ;
graph = updater.httpGet() ;
assertTrue(graph.isEmpty()) ;