code: def test_mx_missing_environment_variables(
      sagemaker_session,
      mxnet_training_version,
      mxnet_training_py_version,
  ):
      mx = MXNet(
          entry_point=SCRIPT_PATH,
          framework_version=mxnet_training_version,
          py_version=mxnet_training_py_version,
          role=ROLE,
          sagemaker_session=sagemaker_session,
          instance_count=INSTANCE_COUNT,
          instance_type=INSTANCE_TYPE,
          environment=None,
      )
      assert not mx.environment
  
imports: from __future__ import absolute_import
  import logging
  import json
  import os
  import pytest
  from mock import MagicMock, Mock, ANY
  from mock import patch
  from pkg_resources import parse_version
  from sagemaker.fw_utils import UploadedCode
  from sagemaker.drift_check_baselines import DriftCheckBaselines
  from sagemaker.metadata_properties import MetadataProperties
  from sagemaker.model_metrics import FileSource, MetricsSource, ModelMetrics
  from sagemaker.mxnet import defaults
  from sagemaker.mxnet import MXNet
  from sagemaker.mxnet import MXNetPredictor, MXNetModel
  from sagemaker.session_settings import SessionSettings
label_desc: Use image node_id 31 for calling a global function with example usage: test_mx_missing_environment_variables(sagemaker_session, mxnet_training_version, mxnet_training_py_version) without return types