code: def run(self):
      self.dump("DONE")
  
imports: import unittest
  from unittest.mock import patch
  import luigi
  import luigi.mock
  from luigi.mock import MockFileSystem, MockTarget
  import gokart
  from gokart.tree.task_info import dump_task_info_table, dump_task_info_tree, make_task_info_as_tree_str, make_task_info_tree
label_desc: Use image node_id 2 for calling the _TaskInfoExampleTaskC obj's underlying member method code with example usage: obj.run() without return types