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import unittest
from cachetools import MRUCache
from . import CacheTestMixin
class MRUCacheTest(unittest.TestCase, CacheTestMixin):
Cache = MRUCache
def test_evict__writes_only(self):
cache = MRUCache(maxsize=2)
cache[1] = 1
cache[2] = 2
cache[3] = 3 # Evicts 1 because nothing's been used yet
assert len(cache) == 2
assert 1 not in cache, "Wrong key was evicted. Should have been '1'."
assert 2 in cache
assert 3 in cache
def test_evict__with_access(self):
cache = MRUCache(maxsize=2)
cache[1] = 1
cache[2] = 2
cache[1]
cache[2]
cache[3] = 3 # Evicts 2
assert 2 not in cache, "Wrong key was evicted. Should have been '2'."
assert 1 in cache
assert 3 in cache
def test_evict__with_delete(self):
cache = MRUCache(maxsize=2)
cache[1] = 1
cache[2] = 2
del cache[2]
cache[3] = 3 # Doesn't evict anything because we just deleted 2
assert 2 not in cache
assert 1 in cache
cache[4] = 4 # Should evict 1 as we just accessed it with __contains__
assert 1 not in cache
assert 3 in cache
assert 4 in cache
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