code: def setup_class(self):
      # provide mountable tmp directory for docker
      tempfile.tempdir = (
          "/tmp" if not platform.system() == "Windows" else None
      )
      test_datmo_dir = os.environ.get(
          "TEST_DATMO_DIR", tempfile.gettempdir()
      )
      self.temp_dir = tempfile.mkdtemp(dir=test_datmo_dir)
      self.storage_file = os.path.join(self.temp_dir, "testing.json")
  
file_path: datmo/datmo/core/util/tests/test_json_store.py
imports: from __future__ import division
  from __future__ import print_function
  from __future__ import unicode_literals
  import tempfile
  import platform
  import os
  from io import open
  from datmo.core.util.json_store import JSONStore
  from datmo.core.util.exceptions import FileIOError
label_desc: Use image node_id 1 for calling the TestJSONStore obj's underlying member method code with example usage: obj.setup_class() without return types