new_contents: # -*- coding: utf-8 -*-
  # Copyright 2017 OpenMarket 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 .. import unittest
  
  from synapse.util.caches.expiringcache import ExpiringCache
  
  from tests.utils import MockClock
  
  
  class ExpiringCacheTestCase(unittest.TestCase):
  
      def test_get_set(self):
          clock = MockClock()
          cache = ExpiringCache("test", clock, max_len=1)
  
          cache["key"] = "value"
          self.assertEquals(cache.get("key"), "value")
          self.assertEquals(cache["key"], "value")
  
      def test_eviction(self):
          clock = MockClock()
          cache = ExpiringCache("test", clock, max_len=2)
  
          cache["key"] = "value"
          cache["key2"] = "value2"
          self.assertEquals(cache.get("key"), "value")
          self.assertEquals(cache.get("key2"), "value2")
  
          cache["key3"] = "value3"
          self.assertEquals(cache.get("key"), None)
          self.assertEquals(cache.get("key2"), "value2")
          self.assertEquals(cache.get("key3"), "value3")
  
      def test_iterable_eviction(self):
          clock = MockClock()
          cache = ExpiringCache("test", clock, max_len=5, iterable=True)
  
          cache["key"] = [1]
          cache["key2"] = [2, 3]
          cache["key3"] = [4, 5]
  
          self.assertEquals(cache.get("key"), [1])
          self.assertEquals(cache.get("key2"), [2, 3])
          self.assertEquals(cache.get("key3"), [4, 5])
  
          cache["key4"] = [6, 7]
          self.assertEquals(cache.get("key"), None)
          self.assertEquals(cache.get("key2"), None)
          self.assertEquals(cache.get("key3"), [4, 5])
          self.assertEquals(cache.get("key4"), [6, 7])
  
      def test_time_eviction(self):
          clock = MockClock()
          cache = ExpiringCache("test", clock, expiry_ms=1000)
          cache.start()
  
          cache["key"] = 1
          clock.advance_time(0.5)
          cache["key2"] = 2
  
          self.assertEquals(cache.get("key"), 1)
          self.assertEquals(cache.get("key2"), 2)
  
          clock.advance_time(0.9)
          self.assertEquals(cache.get("key"), None)
          self.assertEquals(cache.get("key2"), 2)
  
          clock.advance_time(1)
          self.assertEquals(cache.get("key"), None)
          self.assertEquals(cache.get("key2"), None)
  
subject: Add ExpiringCache tests