code:     public void testExceptionTransformer() {
          assertNotNull(TransformerUtils.exceptionTransformer());
          assertSame(TransformerUtils.exceptionTransformer(), TransformerUtils.exceptionTransformer());
          try {
              TransformerUtils.exceptionTransformer().transform(null);
          } catch (final FunctorException ex) {
              try {
                  TransformerUtils.exceptionTransformer().transform(cString);
              } catch (final FunctorException ex2) {
                  return;
              }
          }
          fail();
      }
  
      // nullTransformer
      //------------------------------------------------------------------
  
      @Test
  