### Question:
ChangeLogSerializerFactory { public static ChangeLogSerializerFactory getInstance() { if (instance == null) { instance = new ChangeLogSerializerFactory(); } return instance; } private  ChangeLogSerializerFactory(); static void reset(); static ChangeLogSerializerFactory getInstance(); Map<String, ChangeLogSerializer> getSerializers(); ChangeLogSerializer getSerializer(String fileNameOrExtension); void register(ChangeLogSerializer changeLogSerializer); void unregister(ChangeLogSerializer changeLogSerializer);  }### Answer:
@Test public void getInstance() { assertNotNull(ChangeLogSerializerFactory.getInstance()); assertTrue(ChangeLogSerializerFactory.getInstance() == ChangeLogSerializerFactory.getInstance()); }