code: def test__list_fields(self):
      model = self.model
      fields = model._list_fields()
      self.assertEqual(set(fields), set(self.fields_ans))
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  import pytest
  from .None import util
  import turicreate
  import tempfile
  import numpy
  import platform
  import pytest
  import sys
  import os
  from turicreate.toolkits._main import ToolkitError
  from turicreate.toolkits._internal_utils import _raise_error_if_not_sarray, _mac_ver
label_desc: Use image node_id 14 for calling the OneObjectDetectorSmokeTest obj's underlying member method code with example usage: obj.test__list_fields() without return types