code: def setUp(self):
      luigi.configuration.LuigiConfigParser._instance = None
      luigi.mock.MockFileSystem().clear()
      os.environ.clear()
  
file_path: gokart/test/test_cache_unique_id.py
imports: import os
  import unittest
  import luigi
  import luigi.mock
  import gokart
label_desc: Use image node_id 1 for calling the CacheUniqueIDTest obj's underlying member method code with example usage: obj.setUp() without return types