def test_invertTuple(self):
     
     data = [ [1, 2, 3, 4, 5],
              [6, 7, 8, 9, 10] ]
     
     expected = ( ( 1, 6 ), 
                  ( 2, 7 ), 
                  ( 3, 8 ), 
                  ( 4, 9 ), 
                  ( 5, 10 ) )
     
     self.assertEquals( expected, WriterDocument.invertTuple( data   ) )