code: def test_ensure_last_transform_job_none(transformer):
      transformer.latest_transform_job = None
      with pytest.raises(ValueError) as e:
          transformer._ensure_last_transform_job()
  
      assert "No transform job available" in str(e)
  
imports: from __future__ import absolute_import
  import pytest
  from mock import MagicMock, Mock, patch, PropertyMock
  from sagemaker.session_settings import SessionSettings
  from sagemaker.transformer import _TransformJob, Transformer
  from sagemaker.workflow.pipeline_context import PipelineSession, _PipelineConfig
  from sagemaker.inputs import BatchDataCaptureConfig
  from sagemaker.workflow.pipeline_definition_config import PipelineDefinitionConfig
  from tests.integ import test_local_mode
  from tests.unit import SAGEMAKER_CONFIG_TRANSFORM_JOB
label_desc: Use image node_id 22 for calling a global function with example usage: test_ensure_last_transform_job_none(transformer) without return types