tests/system/core/example_external_task_child_deferrable.py

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from __future__ import annotations

from datetime import datetime

from airflow import DAG
from airflow.operators.bash import BashOperator

with DAG(
    dag_id="child_dag",
    start_date=datetime(2022, 1, 1),
    schedule="@once",
    catchup=False,
    tags=["example", "async", "core"],
) as dag:
    BashOperator(
        task_id="child_task",
        bash_command="echo 1; sleep 1; echo 2; sleep 2; echo 3; sleep 3",
    )


from tests.system.utils import get_test_run

# Needed to run the example DAG with pytest (see: tests/system/README.md#run_via_pytest)
test_run = get_test_run(dag)