code: def test_start_with_location(self, dataflow_mock):
      init_kwargs = {
          "task_id": TASK_ID,
          "template": TEMPLATE,
          "location": TEST_LOCATION,
          "poll_sleep": POLL_SLEEP,
          "wait_until_finished": True,
          "cancel_timeout": CANCEL_TIMEOUT,
      }
      operator = DataflowTemplatedJobStartOperator(**init_kwargs)
      operator.execute(None)
      assert dataflow_mock.called
      _, kwargs = dataflow_mock.call_args_list[0]
      assert not kwargs["variables"]
      assert kwargs["location"] == TEST_LOCATION
  
imports: from __future__ import annotations
  import copy
  from copy import deepcopy
  from unittest import mock
  import pytest
  import airflow
  from airflow.providers.google.cloud.hooks.dataflow import DataflowJobStatus
  from airflow.providers.google.cloud.operators.dataflow import CheckJobRunning, DataflowCreateJavaJobOperator, DataflowCreatePythonJobOperator, DataflowStartFlexTemplateOperator, DataflowStartSqlJobOperator, DataflowStopJobOperator, DataflowTemplatedJobStartOperator
  from airflow.version import version
label_desc: Use image node_id 7 for calling the TestDataflowTemplatedJobStartOperator obj's underlying member method code with example usage: obj.test_start_with_location(dataflow_mock) without return types