code: def setUp(self) -> None:
      luigi.mock.MockFileSystem().clear()
  
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 1 for calling the RestoreTaskByIDTest obj's underlying member method code with example usage: obj.setUp() without return types