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import unittest
class CacheTestMixin:
Cache = None
def test_defaults(self):
cache = self.Cache(maxsize=1)
self.assertEqual(0, len(cache))
self.assertEqual(1, cache.maxsize)
self.assertEqual(0, cache.currsize)
self.assertEqual(1, cache.getsizeof(None))
self.assertEqual(1, cache.getsizeof(""))
self.assertEqual(1, cache.getsizeof(0))
self.assertTrue(repr(cache).startswith(cache.__class__.__name__))
def test_insert(self):
cache = self.Cache(maxsize=2)
cache.update({1: 1, 2: 2})
self.assertEqual(2, len(cache))
self.assertEqual(1, cache[1])
self.assertEqual(2, cache[2])
cache[3] = 3
self.assertEqual(2, len(cache))
self.assertEqual(3, cache[3])
self.assertTrue(1 in cache or 2 in cache)
cache[4] = 4
self.assertEqual(2, len(cache))
self.assertEqual(4, cache[4])
self.assertTrue(1 in cache or 2 in cache or 3 in cache)
def test_update(self):
cache = self.Cache(maxsize=2)
cache.update({1: 1, 2: 2})
self.assertEqual(2, len(cache))
self.assertEqual(1, cache[1])
self.assertEqual(2, cache[2])
cache.update({1: 1, 2: 2})
self.assertEqual(2, len(cache))
self.assertEqual(1, cache[1])
self.assertEqual(2, cache[2])
cache.update({1: "a", 2: "b"})
self.assertEqual(2, len(cache))
self.assertEqual("a", cache[1])
self.assertEqual("b", cache[2])
def test_delete(self):
cache = self.Cache(maxsize=2)
cache.update({1: 1, 2: 2})
self.assertEqual(2, len(cache))
self.assertEqual(1, cache[1])
self.assertEqual(2, cache[2])
del cache[2]
self.assertEqual(1, len(cache))
self.assertEqual(1, cache[1])
self.assertNotIn(2, cache)
del cache[1]
self.assertEqual(0, len(cache))
self.assertNotIn(1, cache)
self.assertNotIn(2, cache)
with self.assertRaises(KeyError):
del cache[1]
self.assertEqual(0, len(cache))
self.assertNotIn(1, cache)
self.assertNotIn(2, cache)
def test_pop(self):
cache = self.Cache(maxsize=2)
cache.update({1: 1, 2: 2})
self.assertEqual(2, cache.pop(2))
self.assertEqual(1, len(cache))
self.assertEqual(1, cache.pop(1))
self.assertEqual(0, len(cache))
with self.assertRaises(KeyError):
cache.pop(2)
with self.assertRaises(KeyError):
cache.pop(1)
with self.assertRaises(KeyError):
cache.pop(0)
self.assertEqual(None, cache.pop(2, None))
self.assertEqual(None, cache.pop(1, None))
self.assertEqual(None, cache.pop(0, None))
def test_popitem(self):
cache = self.Cache(maxsize=2)
cache.update({1: 1, 2: 2})
self.assertIn(cache.pop(1), {1: 1, 2: 2})
self.assertEqual(1, len(cache))
self.assertIn(cache.pop(2), {1: 1, 2: 2})
self.assertEqual(0, len(cache))
with self.assertRaises(KeyError):
cache.popitem()
def test_popitem_exception_context(self):
# since Python 3.7, MutableMapping.popitem() suppresses
# exception context as implementation detail
exception = None
try:
self.Cache(maxsize=2).popitem()
except Exception as e:
exception = e
self.assertIsNone(exception.__cause__)
self.assertTrue(exception.__suppress_context__)
def test_missing(self):
class DefaultCache(self.Cache):
def __missing__(self, key):
self[key] = key
return key
cache = DefaultCache(maxsize=2)
self.assertEqual(0, cache.currsize)
self.assertEqual(2, cache.maxsize)
self.assertEqual(0, len(cache))
self.assertEqual(1, cache[1])
self.assertEqual(2, cache[2])
self.assertEqual(2, len(cache))
self.assertTrue(1 in cache and 2 in cache)
self.assertEqual(3, cache[3])
self.assertEqual(2, len(cache))
self.assertTrue(3 in cache)
self.assertTrue(1 in cache or 2 in cache)
self.assertTrue(1 not in cache or 2 not in cache)
self.assertEqual(4, cache[4])
self.assertEqual(2, len(cache))
self.assertTrue(4 in cache)
self.assertTrue(1 in cache or 2 in cache or 3 in cache)
# verify __missing__() is *not* called for any operations
# besides __getitem__()
self.assertEqual(4, cache.get(4))
self.assertEqual(None, cache.get(5))
self.assertEqual(5 * 5, cache.get(5, 5 * 5))
self.assertEqual(2, len(cache))
self.assertEqual(4, cache.pop(4))
with self.assertRaises(KeyError):
cache.pop(5)
self.assertEqual(None, cache.pop(5, None))
self.assertEqual(5 * 5, cache.pop(5, 5 * 5))
self.assertEqual(1, len(cache))
cache.clear()
cache[1] = 1 + 1
self.assertEqual(1 + 1, cache.setdefault(1))
self.assertEqual(1 + 1, cache.setdefault(1, 1))
self.assertEqual(1 + 1, cache[1])
self.assertEqual(2 + 2, cache.setdefault(2, 2 + 2))
self.assertEqual(2 + 2, cache.setdefault(2, None))
self.assertEqual(2 + 2, cache.setdefault(2))
self.assertEqual(2 + 2, cache[2])
self.assertEqual(2, len(cache))
self.assertTrue(1 in cache and 2 in cache)
self.assertEqual(None, cache.setdefault(3))
self.assertEqual(2, len(cache))
self.assertTrue(3 in cache)
self.assertTrue(1 in cache or 2 in cache)
self.assertTrue(1 not in cache or 2 not in cache)
def test_missing_getsizeof(self):
class DefaultCache(self.Cache):
def __missing__(self, key):
try:
self[key] = key
except ValueError:
pass # not stored
return key
cache = DefaultCache(maxsize=2, getsizeof=lambda x: x)
self.assertEqual(0, cache.currsize)
self.assertEqual(2, cache.maxsize)
self.assertEqual(1, cache[1])
self.assertEqual(1, len(cache))
self.assertEqual(1, cache.currsize)
self.assertIn(1, cache)
self.assertEqual(2, cache[2])
self.assertEqual(1, len(cache))
self.assertEqual(2, cache.currsize)
self.assertNotIn(1, cache)
self.assertIn(2, cache)
self.assertEqual(3, cache[3]) # not stored
self.assertEqual(1, len(cache))
self.assertEqual(2, cache.currsize)
self.assertEqual(1, cache[1])
self.assertEqual(1, len(cache))
self.assertEqual(1, cache.currsize)
self.assertEqual((1, 1), cache.popitem())
def _test_getsizeof(self, cache):
self.assertEqual(0, cache.currsize)
self.assertEqual(3, cache.maxsize)
self.assertEqual(1, cache.getsizeof(1))
self.assertEqual(2, cache.getsizeof(2))
self.assertEqual(3, cache.getsizeof(3))
cache.update({1: 1, 2: 2})
self.assertEqual(2, len(cache))
self.assertEqual(3, cache.currsize)
self.assertEqual(1, cache[1])
self.assertEqual(2, cache[2])
cache[1] = 2
self.assertEqual(1, len(cache))
self.assertEqual(2, cache.currsize)
self.assertEqual(2, cache[1])
self.assertNotIn(2, cache)
cache.update({1: 1, 2: 2})
self.assertEqual(2, len(cache))
self.assertEqual(3, cache.currsize)
self.assertEqual(1, cache[1])
self.assertEqual(2, cache[2])
cache[3] = 3
self.assertEqual(1, len(cache))
self.assertEqual(3, cache.currsize)
self.assertEqual(3, cache[3])
self.assertNotIn(1, cache)
self.assertNotIn(2, cache)
with self.assertRaises(ValueError):
cache[3] = 4
self.assertEqual(1, len(cache))
self.assertEqual(3, cache.currsize)
self.assertEqual(3, cache[3])
with self.assertRaises(ValueError):
cache[4] = 4
self.assertEqual(1, len(cache))
self.assertEqual(3, cache.currsize)
self.assertEqual(3, cache[3])
def test_getsizeof_param(self):
self._test_getsizeof(self.Cache(maxsize=3, getsizeof=lambda x: x))
def test_getsizeof_subclass(self):
class Cache(self.Cache):
def getsizeof(self, value):
return value
self._test_getsizeof(Cache(maxsize=3))
def test_pickle(self):
import pickle
source = self.Cache(maxsize=2)
source.update({1: 1, 2: 2})
cache = pickle.loads(pickle.dumps(source))
self.assertEqual(source, cache)
self.assertEqual(2, len(cache))
self.assertEqual(1, cache[1])
self.assertEqual(2, cache[2])
cache[3] = 3
self.assertEqual(2, len(cache))
self.assertEqual(3, cache[3])
self.assertTrue(1 in cache or 2 in cache)
cache[4] = 4
self.assertEqual(2, len(cache))
self.assertEqual(4, cache[4])
self.assertTrue(1 in cache or 2 in cache or 3 in cache)
self.assertEqual(cache, pickle.loads(pickle.dumps(cache)))
def test_pickle_maxsize(self):
import pickle
import sys
# test empty cache, single element, large cache (recursion limit)
for n in [0, 1, sys.getrecursionlimit() * 2]:
source = self.Cache(maxsize=n)
source.update((i, i) for i in range(n))
cache = pickle.loads(pickle.dumps(source))
self.assertEqual(n, len(cache))
self.assertEqual(source, cache)
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