code: def test_list_append(self):
      def f():
          l = TestList([1])
          l.append(2)
          l.append(3)
          return l
  
      tr = self.transform(f, lists, operator_overload=OperatorList())
  
      tl = tr()
  
      self.assertIsInstance(tl, TestList)
      self.assertEqual(tl, [1, 2, 3])
  
imports: from nvidia.dali._autograph.converters import directives
  from nvidia.dali._autograph.converters import lists
  from nvidia.dali._autograph.core import converter_testing
  from nvidia.dali._autograph.utils import hooks
label_desc: Use image node_id 3 for calling the ListTest obj's underlying member method code with example usage: obj.test_list_append() and returns: l