code: def test_render_template(self):
      dag_run = DagRun(
          dag_id=self.mock_operator.dag_id,
          execution_date=DEFAULT_DATE,
          run_id="test",
      )
      ti = TaskInstance(task=self.mock_operator)
      ti.dag_run = dag_run
      ti.render_templates()
  
      expected_rendered_template = {"$lt": "2017-01-01T00:00:00+00:00Z"}
  
      assert expected_rendered_template == getattr(
          self.mock_operator, "mongo_query"
      )
  
file_path: airflow/tests/providers/amazon/aws/transfers/test_mongo_to_s3.py
imports: from __future__ import annotations
  from unittest import mock
  import pytest
  from airflow.models import DAG, DagRun, TaskInstance
  from airflow.providers.amazon.aws.transfers.mongo_to_s3 import MongoToS3Operator
  from airflow.utils import timezone
label_desc: Use image node_id 4 for calling the TestMongoToS3Operator obj's underlying member method code with example usage: obj.test_render_template() without return types