ReferenceChangeTracker { public String get(String oldUUID) { return uuidMap.get(oldUUID); }  String get(String oldUUID); void put(String oldUUID, String newUUID); void clear(); void processedReference(Object refProp); Iterator<Object> getProcessedReferences(); boolean removeReferences(List<Object> processedReferences);  }
@Test public void testGet() { assertNull(rct.get("old")); rct.put("old", "new"); assertEquals("new", rct.get("old")); }