1import unittest
2
3from cachetools import LFUCache
4
5from . import CacheTestMixin
6
7
8class LFUCacheTest(unittest.TestCase, CacheTestMixin):
9
10    Cache = LFUCache
11
12    def test_lfu(self):
13        cache = LFUCache(maxsize=2)
14
15        cache[1] = 1
16        cache[1]
17        cache[2] = 2
18        cache[3] = 3
19
20        self.assertEqual(len(cache), 2)
21        self.assertEqual(cache[1], 1)
22        self.assertTrue(2 in cache or 3 in cache)
23        self.assertTrue(2 not in cache or 3 not in cache)
24
25        cache[4] = 4
26        self.assertEqual(len(cache), 2)
27        self.assertEqual(cache[4], 4)
28        self.assertEqual(cache[1], 1)
29
30    def test_lfu_getsizeof(self):
31        cache = LFUCache(maxsize=3, getsizeof=lambda x: x)
32
33        cache[1] = 1
34        cache[2] = 2
35
36        self.assertEqual(len(cache), 2)
37        self.assertEqual(cache[1], 1)
38        self.assertEqual(cache[2], 2)
39
40        cache[3] = 3
41
42        self.assertEqual(len(cache), 1)
43        self.assertEqual(cache[3], 3)
44        self.assertNotIn(1, cache)
45        self.assertNotIn(2, cache)
46
47        with self.assertRaises(ValueError):
48            cache[4] = 4
49        self.assertEqual(len(cache), 1)
50        self.assertEqual(cache[3], 3)
51