@Test public void testPersistenceDir() throws IOException, DDFException { DDFManager manager = DDFManager.get(DDFManager.EngineType.BASIC); DDF ddf = manager.newDDF(); List<String> namespaces = ddf.getPersistenceHandler().listNamespaces(); Assert.assertNotNull(namespaces); for (String namespace : namespaces) { List<String> ddfs = ddf.getPersistenceHandler().listItems(namespace); Assert.assertNotNull(ddfs); } }