old_contents: # -*- coding: utf-8 -*-
  #
  # Licensed to the Apache Software Foundation (ASF) under one
  # or more contributor license agreements.  See the NOTICE file
  # distributed with this work for additional information
  # regarding copyright ownership.  The ASF licenses this file
  # to you under the Apache License, Version 2.0 (the
  # "License"); you may not use this file except in compliance
  # with the License.  You may obtain a copy of the License at
  #
  #   http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing,
  # software distributed under the License is distributed on an
  # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  # KIND, either express or implied.  See the License for the
  # specific language governing permissions and limitations
  # under the License.
  from datetime import datetime
  
  from airflow.models import DAG
  from airflow.operators.bash_operator import BashOperator
  
  DEFAULT_DATE = datetime(2016, 1, 1)
  
  args = {
      'owner': 'airflow',
      'start_date': DEFAULT_DATE,
  }
  
  dag = DAG(dag_id='test_mark_success', default_args=args)
  task = BashOperator(
      task_id='task1',
      bash_command='sleep 600',
      dag=dag)
  
new_contents: # -*- coding: utf-8 -*-
  #
  # Licensed to the Apache Software Foundation (ASF) under one
  # or more contributor license agreements.  See the NOTICE file
  # distributed with this work for additional information
  # regarding copyright ownership.  The ASF licenses this file
  # to you under the Apache License, Version 2.0 (the
  # "License"); you may not use this file except in compliance
  # with the License.  You may obtain a copy of the License at
  #
  #   http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing,
  # software distributed under the License is distributed on an
  # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  # KIND, either express or implied.  See the License for the
  # specific language governing permissions and limitations
  # under the License.
  from datetime import datetime
  from time import sleep
  
  from airflow.models import DAG
  from airflow.operators.python_operator import PythonOperator
  
  DEFAULT_DATE = datetime(2016, 1, 1)
  
  args = {
      'owner': 'airflow',
      'start_date': DEFAULT_DATE,
  }
  
  
  dag = DAG(dag_id='test_mark_success', default_args=args)
  task = PythonOperator(
      task_id='task1',
      python_callable=lambda x: sleep(x),  # pylint: disable=W0108
      op_args=[600],
      dag=dag)
  
subject: improve flakey test test_mark_success_no_kill (#6959)