### Question:
FinalMappings implements IFinalMapping { @Override synchronized public final void set(List<Map<Integer, Integer>> list) { this.clear(); mappings.addAll(list); } protected  FinalMappings(); synchronized static FinalMappings getInstance(); @Override synchronized void add(Map<Integer, Integer> mapping); @Override synchronized final void set(List<Map<Integer, Integer>> list); @Override synchronized Iterator<Map<Integer, Integer>> getIterator(); @Override synchronized void clear(); @Override synchronized List<Map<Integer, Integer>> getFinalMapping(); @Override synchronized int getSize();  }### Answer:
@Test public void testSet() { Map<Integer, Integer> mapping1 = new TreeMap<Integer, Integer>(); mapping1.put(1, 1); mapping1.put(2, 2); mapping1.put(3, 3); Map<Integer, Integer> mapping2 = new TreeMap<Integer, Integer>(); mapping2.put(1, 2); mapping2.put(2, 1); mapping2.put(3, 3); List<Map<Integer, Integer>> mappings = new ArrayList<Map<Integer, Integer>>(2); mappings.add(mapping1); mappings.add(mapping2); FinalMappings instance = new FinalMappings(); instance.set(mappings); assertEquals(2, instance.getSize()); }