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import random
import unittest
from cachetools import RRCache
from . import CacheTestMixin
class RRCacheTest(unittest.TestCase, CacheTestMixin):
Cache = RRCache
def test_rr(self):
cache = RRCache(maxsize=2, choice=min)
self.assertEqual(min, cache.choice)
cache[1] = 1
cache[2] = 2
cache[3] = 3
self.assertEqual(2, len(cache))
self.assertEqual(2, cache[2])
self.assertEqual(3, cache[3])
self.assertNotIn(1, cache)
cache[0] = 0
self.assertEqual(2, len(cache))
self.assertEqual(0, cache[0])
self.assertEqual(3, cache[3])
self.assertNotIn(2, cache)
cache[4] = 4
self.assertEqual(2, len(cache))
self.assertEqual(3, cache[3])
self.assertEqual(4, cache[4])
self.assertNotIn(0, cache)
def test_rr_getsizeof(self):
cache = RRCache(maxsize=3, choice=min, 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)
def test_rr_update_existing(self):
cache = RRCache(maxsize=2, choice=min)
cache[1] = 1
cache[2] = 2
cache[1] = "updated"
cache[3] = 3
self.assertIn(2, cache)
self.assertIn(3, cache)
self.assertNotIn(1, cache)
def test_rr_bad_choice(self):
def bad_choice(seq):
raise ValueError("test error")
cache = RRCache(maxsize=2, choice=bad_choice)
cache[1] = 1
cache[2] = 2
with self.assertRaises(ValueError):
cache[3] = 3
self.assertEqual(len(cache), 2)
self.assertEqual(cache.currsize, 2)
self.assertIn(1, cache)
self.assertIn(2, cache)
self.assertNotIn(3, cache)
def test_rr_default_choice(self):
cache = RRCache(maxsize=2)
self.assertIs(cache.choice, random.choice)
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