new_contents: # -*- coding: utf-8 -*-
  # Copyright 2018 New Vector Ltd
  #
  # 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.
  
  from tests.unittest import HomeserverTestCase
  
  
  class TransactionStoreTestCase(HomeserverTestCase):
      def prepare(self, reactor, clock, homeserver):
          self.store = homeserver.get_datastore()
  
      def test_get_set_transactions(self):
          """Tests that we can successfully get a non-existent entry for
          destination retries, as well as testing tht we can set and get
          correctly.
          """
          d = self.store.get_destination_retry_timings("example.com")
          r = self.get_success(d)
          self.assertIsNone(r)
  
          d = self.store.set_destination_retry_timings("example.com", 50, 100)
          self.get_success(d)
  
          d = self.store.get_destination_retry_timings("example.com")
          r = self.get_success(d)
  
          self.assert_dict({"retry_last_ts": 50, "retry_interval": 100}, r)
  
      def test_initial_set_transactions(self):
          """Tests that we can successfully set the destination retries (there
          was a bug around invalidating the cache that broke this)
          """
          d = self.store.set_destination_retry_timings("example.com", 50, 100)
          self.get_success(d)
  
subject: Add tests