text: #
  # 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.
  import time
  import unittest
  from datetime import timedelta
  
  from airflow.exceptions import AirflowSensorTimeout, AirflowSkipException
  from airflow.models.dag import DAG
  from airflow.sensors.base import BaseSensorOperator
  from airflow.utils import timezone
  from airflow.utils.decorators import apply_defaults
  from airflow.utils.timezone import datetime
  
  DEFAULT_DATE = datetime(2015, 1, 1)
  TEST_DAG_ID = 'unit_test_dag'
  
  
  class TimeoutTestSensor(BaseSensorOperator):
      """
      Sensor that always returns the return_value provided
  
      :param return_value: Set to true to mark the task as SKIPPED on failure
      :type return_value: any
      """
  
      @apply_defaults
      def __init__(self, return_value=False, **kwargs):
          self.return_value = return_value
          super().__init__(**kwargs)
  
      def poke(self, context):
          return self.return_value
  
      def execute(self, context):
          started_at = timezone.utcnow()
          time_jump = self.params.get('time_jump')
          while not self.poke(context):
              if time_jump:
                  started_at -= time_jump
              if (timezone.utcnow() - started_at).total_seconds() > self.timeout:
                  if self.soft_fail:
                      raise AirflowSkipException('Snap. Time is OUT.')
                  else:
                      raise AirflowSensorTimeout('Snap. Time is OUT.')
              time.sleep(self.poke_interval)
          self.log.info("Success criteria met. Exiting.")
  
  
  class TestSensorTimeout(unittest.TestCase):
      def setUp(self):
          args = {'owner': 'airflow', 'start_date': DEFAULT_DATE}
          self.dag = DAG(TEST_DAG_ID, default_args=args)
  
      def test_timeout(self):
          op = TimeoutTestSensor(
              task_id='test_timeout',
              execution_timeout=timedelta(days=2),
              return_value=False,
              poke_interval=5,
              params={'time_jump': timedelta(days=2, seconds=1)},
              dag=self.dag,
          )
          self.assertRaises(
              AirflowSensorTimeout, op.run, start_date=DEFAULT_DATE, end_date=DEFAULT_DATE, ignore_ti_state=True
          )
  