code: def test_create_with_invalid_user_define_classes(self):
      sf = self.sf.head()
      old_stdout = sys.stdout
      result_out = StringIO()
      sys.stdout = result_out
      model = tc.object_detector.create(
          sf,
          feature=self.feature,
          annotations=self.annotations,
          classes=["invalid"],
          max_iterations=1,
      )
      sys.stdout = old_stdout
      self.assertTrue("Warning" in result_out.getvalue())
  
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
  from six import StringIO
label_desc: Use image node_id 9 for calling the ObjectDetectorTest obj's underlying member method code with example usage: obj.test_create_with_invalid_user_define_classes() without return types