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class CacheTestMixin(object):
def make_cache(self, maxsize, getsizeof=None):
raise NotImplementedError
def test_insert(self):
cache = self.make_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.make_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.make_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)
def test_pop(self):
cache = self.make_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.make_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_getsizeof(self):
cache = self.make_cache(maxsize=3, getsizeof=lambda x: x)
self.assertEqual(3, cache.maxsize)
self.assertEqual(0, cache.currsize)
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[4] = 4
self.assertEqual(1, len(cache))
self.assertEqual(3, cache.currsize)
self.assertEqual(3, cache[3])
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