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import unittest
from cachetools import LRUCache
from . import CacheTestMixin
class LRUCacheTest(unittest.TestCase, CacheTestMixin):
def cache(self, maxsize, missing=None, getsizeof=None):
return LRUCache(maxsize, missing=missing, getsizeof=getsizeof)
def test_lru(self):
cache = self.cache(maxsize=2)
cache[1] = 1
cache[2] = 2
cache[3] = 3
self.assertEqual(len(cache), 2)
self.assertEqual(cache[2], 2)
self.assertEqual(cache[3], 3)
self.assertNotIn(1, cache)
cache[2]
cache[4] = 4
self.assertEqual(len(cache), 2)
self.assertEqual(cache[2], 2)
self.assertEqual(cache[4], 4)
self.assertNotIn(3, cache)
cache[5] = 5
self.assertEqual(len(cache), 2)
self.assertEqual(cache[4], 4)
self.assertEqual(cache[5], 5)
self.assertNotIn(2, cache)
def test_lru_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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