code: def test_exec(self):
      self.assert_body_anfs_as_expected(
          exec_expected_result, _exec_test_function
      )
  
imports: import textwrap
  import unittest
  import gast
  from nvidia.dali._autograph.pyct import loader
  from nvidia.dali._autograph.pyct import parser
  from nvidia.dali._autograph.pyct import transformer
  from nvidia.dali._autograph.pyct.common_transformers import anf
label_desc: Use image node_id 19 for calling the AnfTransformerTest obj's underlying member method code with example usage: obj.test_exec() without return types