code: def setUp(self) -> None:
      self.patcher = patch.dict(
          os.environ,
          {
              "RAYCI_CHECKOUT_DIR": "/ray",
              "RAYCI_BUILD_ID": "123",
              "RAYCI_WORK_REPO": "rayproject/citemp",
              "BUILDKITE_COMMIT": "123456",
              "BUILDKITE_BRANCH": "master",
              "BUILDKITE_PIPELINE_ID": "123456",
          },
      )
      self.patcher.start()
  
file_path: ray/ci/ray_ci/test_base.py
imports: import os
  import unittest
  from unittest.mock import patch
  from ci.ray_ci.builder_container import PYTHON_VERSIONS
  from ci.ray_ci.builder import DEFAULT_PYTHON_VERSION
label_desc: Use image node_id 1 for calling the RayCITestBase obj's underlying member method code with example usage: obj.setUp() without return types