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import unittest
from cachetools import LFUCache
from . import CacheTestMixin
class LFUCacheTest(unittest.TestCase, CacheTestMixin):
def cache(self, maxsize, missing=None, getsizeof=None):
return LFUCache(maxsize, missing=missing, getsizeof=getsizeof)
def test_lfu(self):
cache = self.cache(maxsize=2)
cache[1] = 1
cache[1]
cache[2] = 2
cache[3] = 3
self.assertEqual(len(cache), 2)
self.assertEqual(cache[1], 1)
self.assertTrue(2 in cache or 3 in cache)
self.assertTrue(2 not in cache or 3 not in cache)
cache[4] = 4
self.assertEqual(len(cache), 2)
self.assertEqual(cache[4], 4)
self.assertEqual(cache[1], 1)
def test_lfu_getsizeof(self):
cache = self.cache(maxsize=3, getsizeof=lambda x: x)
cache[1] = 1
cache[2] = 2
self.assertEqual(len(cache), 2)
self.assertEqual(cache[1], 1)
self.assertEqual(cache[2], 2)
cache[3] = 3
self.assertEqual(len(cache), 1)
self.assertEqual(cache[3], 3)
self.assertNotIn(1, cache)
self.assertNotIn(2, cache)
with self.assertRaises(ValueError):
cache[4] = 4
self.assertEqual(len(cache), 1)
self.assertEqual(cache[3], 3)
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