code: def test_trigger_dag(self):
      url_template = "/api/experimental/dags/{}/dag_runs"
      run_id = "my_run" + utcnow().isoformat()
  
      # Test error for nonexistent dag
      response = self.client.post(
          url_template.format("does_not_exist_dag"),
          data=json.dumps({}),
          content_type="application/json",
      )
      assert 404 == response.status_code
  
      # Test error for bad conf data
      response = self.client.post(
          url_template.format("example_bash_operator"),
          data=json.dumps({"conf": "This is a string not a dict"}),
          content_type="application/json",
      )
      assert 400 == response.status_code
  
      # Test OK case
      response = self.client.post(
          url_template.format("example_bash_operator"),
          data=json.dumps(
              {"run_id": run_id, "conf": {"param": "value"}}
          ),
          content_type="application/json",
      )
      self.assert_deprecated(response)
  
      assert 200 == response.status_code
      response_execution_date = parse_datetime(
          json.loads(response.data.decode("utf-8"))["execution_date"]
      )
      assert 0 == response_execution_date.microsecond
  
      # Check execution_date is correct
      response = json.loads(response.data.decode("utf-8"))
      dagbag = DagBag()
      dag = dagbag.get_dag("example_bash_operator")
      dag_run = dag.get_dagrun(response_execution_date)
      dag_run_id = dag_run.run_id
      assert run_id == dag_run_id
      assert dag_run_id == response["run_id"]
  
imports: from __future__ import annotations
  import json
  import os
  import re
  from datetime import timedelta
  from unittest import mock
  from urllib.parse import quote_plus
  import pytest
  from airflow import settings
  from airflow.api.common.experimental.trigger_dag import trigger_dag
  from airflow.models import DagBag, DagRun, Pool, TaskInstance
  from airflow.models.serialized_dag import SerializedDagModel
  from airflow.settings import Session
  from airflow.utils.timezone import datetime, parse, utcnow
  from airflow.version import version
  from tests.test_utils.db import clear_db_pools
label_desc: Use image node_id 7 for calling the TestApiExperimental obj's underlying member method code with example usage: obj.test_trigger_dag() without return types