code: def test_task_without_dag():
      """
      Test that if a task doesn't have a DAG when it's being set as the relative of another task which
      has a DAG, the task should be added to the root TaskGroup of the other task's DAG.
      """
      dag = DAG(
          dag_id="test_task_without_dag",
          start_date=pendulum.parse("20200101"),
      )
      op1 = EmptyOperator(task_id="op1", dag=dag)
      op2 = EmptyOperator(task_id="op2")
      op3 = EmptyOperator(task_id="op3")
      op1 >> op2
      op3 >> op2
  
      assert op1.dag == op2.dag == op3.dag
      assert dag.task_group.children.keys() == {"op1", "op2", "op3"}
      assert dag.task_group.children.keys() == dag.task_dict.keys()
  
imports: from __future__ import annotations
  from datetime import timedelta
  import pendulum
  import pytest
  from airflow.decorators import dag, setup, task, task_group, teardown
  from airflow.exceptions import TaskAlreadyInTaskGroup
  from airflow.models.baseoperator import BaseOperator
  from airflow.models.dag import DAG
  from airflow.models.xcom_arg import XComArg
  from airflow.operators.bash import BashOperator
  from airflow.operators.empty import EmptyOperator
  from airflow.operators.python import PythonOperator
  from airflow.utils.dag_edges import dag_edges
  from airflow.utils.task_group import TaskGroup, task_group_to_dict
  from tests.models import DEFAULT_DATE
label_desc: Use image node_id 12 for calling a global function with example usage: test_task_without_dag() without return types