text: # coding: utf-8
  #
  # Copyright 2018 The Oppia Authors. All Rights Reserved.
  #
  # Licensed 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.
  
  """Tests for the GAE taskqueue API wrapper."""
  from __future__ import absolute_import  # pylint: disable=import-only-modules
  from __future__ import unicode_literals  # pylint: disable=import-only-modules
  
  import json
  import operator
  
  from core.platform.taskqueue import gae_taskqueue_services as taskqueue_services
  from core.tests import test_utils
  import feconf
  
  from google.appengine.ext import deferred
  
  
  class TaskQueueTests(test_utils.GenericTestBase):
      """Tests for taskqueue-related operations."""
  
      def test_defer(self):
          taskqueue_services.defer(
              operator.add, taskqueue_services.QUEUE_NAME_DEFAULT, 1, 2)
  
          tasks = self.taskqueue_stub.get_filtered_tasks()
          self.assertEqual(len(tasks), 1)
  
          result = deferred.run(tasks[0].payload)
          self.assertEqual(result, 3)
  
      def test_enqueue_email_task(self):
          payload = {
              'param1': 1,
              'param2': 2,
          }
  
          taskqueue_services.enqueue_email_task(
              feconf.TASK_URL_FLAG_EXPLORATION_EMAILS, payload, 0)
          tasks = self.taskqueue_stub.get_filtered_tasks(
              queue_names=taskqueue_services.QUEUE_NAME_EMAILS)
          self.assertEqual(len(tasks), 1)
          self.assertEqual(tasks[0].payload, json.dumps(payload))
  