code: def test_ensure_last_transform_job_exists(
      transformer, sagemaker_session
  ):
      transformer.latest_transform_job = _TransformJob(
          sagemaker_session, "some-transform-job"
      )
      transformer._ensure_last_transform_job()
  
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 21 for calling a global function with example usage: test_ensure_last_transform_job_exists(transformer, sagemaker_session) without return types