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"""This dag only runs some simple tasks to test Airflow's task execution."""
from datetime import datetime, timedelta

from airflow.models.dag import DAG
from airflow.operators.dummy import DummyOperator
from airflow.utils.dates import days_ago

now = datetime.now()
now_to_the_hour = (now - timedelta(0, 0, 0, 0, 0, 3)).replace(minute=0, second=0, microsecond=0)
START_DATE = now_to_the_hour
DAG_NAME = 'test_dag_v1'

default_args = {'owner': 'airflow', 'depends_on_past': True, 'start_date': days_ago(2)}
dag = DAG(DAG_NAME, schedule_interval='*/10 * * * *', default_args=default_args)

run_this_1 = DummyOperator(task_id='run_this_1', dag=dag)
run_this_2 = DummyOperator(task_id='run_this_2', dag=dag)
run_this_2.set_upstream(run_this_1)
run_this_3 = DummyOperator(task_id='run_this_3', dag=dag)
run_this_3.set_upstream(run_this_2)