synapse/tests/util/test_lrucache.py

# -*- coding: utf-8 -*-
# Copyright 2015, 2016 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.lrucache import LruCache

class LruCacheTestCase(unittest.TestCase):

    def test_get_set(self):
        cache = LruCache(1, 1)
        cache[("key",)] = "value"
        self.assertEquals(cache.get(("key",)), "value")
        self.assertEquals(cache[("key",)], "value")

    def test_eviction(self):
        cache = LruCache(2, 1)
        cache[(1,)] = 1
        cache[(2,)] = 2

        self.assertEquals(cache.get((1,)), 1)
        self.assertEquals(cache.get((2,)), 2)

        cache[(3,)] = 3

        self.assertEquals(cache.get((1,)), None)
        self.assertEquals(cache.get((2,)), 2)
        self.assertEquals(cache.get((3,)), 3)

    def test_setdefault(self):
        cache = LruCache(1, 1)
        self.assertEquals(cache.setdefault(("key",), 1), 1)
        self.assertEquals(cache.get(("key",)), 1)
        self.assertEquals(cache.setdefault(("key",), 2), 1)
        self.assertEquals(cache.get(("key",)), 1)

    def test_pop(self):
        cache = LruCache(1, 1)
        cache[("key",)] = 1
        self.assertEquals(cache.pop(("key",)), 1)
        self.assertEquals(cache.pop(("key",)), None)