code: def setUp(cls) -> None:
      if PROJECT_ENV_NAME in os.environ:
          del os.environ[PROJECT_ENV_NAME]
  
file_path: neptune-client/tests/unit/neptune/management/internal/test_api.py
imports: import os
  import unittest
  from unittest.mock import call
  from mock import patch
  from neptune import ANONYMOUS_API_TOKEN
  from neptune.common.envs import API_TOKEN_ENV_NAME
  from neptune.envs import PROJECT_ENV_NAME
  from neptune.internal.backends.hosted_client import DEFAULT_REQUEST_KWARGS
  from neptune.internal.backends.neptune_backend_mock import NeptuneBackendMock
  from neptune.management import clear_trash, delete_objects_from_trash, trash_objects
label_desc: Use image node_id 2 for calling the TestTrashObjects obj's underlying member method code with example usage: obj.setUp(cls) without return types