code:     public void testExceptionFactory() {
          assertNotNull(FactoryUtils.exceptionFactory());
          assertSame(FactoryUtils.exceptionFactory(), FactoryUtils.exceptionFactory());
          try {
              FactoryUtils.exceptionFactory().create();
          } catch (final FunctorException ex) {
              try {
                  FactoryUtils.exceptionFactory().create();
              } catch (final FunctorException ex2) {
                  return;
              }
          }
          fail();
      }
  
      // nullFactory
      //------------------------------------------------------------------
  
      @Test
  