code:     public void testSingletonPatternInSerialization() {
          final Object[] singletones = new Object[] {
                  CloneTransformer.INSTANCE,
                  ExceptionTransformer.INSTANCE,
                  NOPTransformer.INSTANCE,
                  StringValueTransformer.stringValueTransformer(),
          };
  
          for (final Object original : singletones) {
              TestUtils.assertSameAfterSerialization("Singleton pattern broken for " + original.getClass(), original);
          }
      }
  
  