map.put("A", null);
map.put("B", null);
map.put("C", null);
source.setStandardMap(map);
MapToMapPrime destination = newInstance(MapToMapPrime.class);
HashMap<String, Serializable> map2 = newInstance(HashMap.class);
destination.setStandardMap(map2);
mapper.map(source, destination);
Map<?, ?> resultingMap = destination.getStandardMap();
assertNotNull(resultingMap);
assertEquals(3, resultingMap.size());
assertNull(resultingMap.get("A"));
assertNull(resultingMap.get("B"));