OpenJPAEntityManagerSPI em = emf.createEntityManager();
em.getTransaction().begin();
PObject pc = new PObject();
pc.setName(useDataCache ? MARKER_DATACACHE : MARKER_CACHE);
em.persist(pc);
em.getTransaction().commit();
Object oid = pc.getId();
StoreCache dataCache = emf.getStoreCache();
assertEquals(useDataCache, dataCache.contains(PObject.class, oid));