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 unittest
  from unittest import mock
  
  from airflow.executors.sequential_executor import SequentialExecutor
  
  
  class TestSequentialExecutor(unittest.TestCase):
  
      @mock.patch('airflow.executors.sequential_executor.SequentialExecutor.sync')
      @mock.patch('airflow.executors.base_executor.BaseExecutor.trigger_tasks')
      @mock.patch('airflow.executors.base_executor.Stats.gauge')
      def test_gauge_executor_metrics(self, mock_stats_gauge, mock_trigger_tasks, mock_sync):
          executor = SequentialExecutor()
          executor.heartbeat()
          calls = [mock.call('executor.open_slots', mock.ANY),
                   mock.call('executor.queued_tasks', mock.ANY),
                   mock.call('executor.running_tasks', mock.ANY)]
          mock_stats_gauge.assert_has_calls(calls)
  
  
  if __name__ == '__main__':
      unittest.main()
  