code: def run(self):
      self.dump("test")
  
file_path: gokart/test/test_restore_task_by_id.py
imports: import unittest
  from unittest.mock import patch
  import luigi
  import luigi.mock
  import gokart
label_desc: Use image node_id 2 for calling the _DummyTask obj's underlying member method code with example usage: obj.run() without return types