code: def _get_env(self):
      self.run_s3_test = (
          ("FILE_UTIL_TEST_S3_BUCKET" in os.environ)
          and "AWS_ACCESS_KEY_ID" in os.environ
          and "AWS_SECRET_ACCESS_KEY" in os.environ
      )
  
      if self.run_s3_test:
          self.s3_test_path = os.environ["FILE_UTIL_TEST_S3_BUCKET"]
      else:
          self.s3_test_path = None
  
file_path: turicreate/src/python/turicreate/test/test_file_util.py
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import os
  import unittest
  from ..util import _file_util
  import pytest
label_desc: Use image node_id 2 for calling the FileUtilTests obj's underlying member method code with example usage: obj._get_env() without return types