def test_key_expiration(self):
clock = FakeClock(0.0)
cache = utils.ExpiringCache(ttl=1.0, clock=clock)
cache['the answer'] = 42
clock.now = 0.999999
self.assertEqual(42, cache['the answer'])
clock.now = 1.0
self.assertEqual(None, cache.get('the answer'))
clock.now = 1.000001
self.assertEqual(None, cache.get('the answer'))
def test_nonzero_full_expiration(self):
clock = FakeClock(0.0)
cache = utils.ExpiringCache(ttl=1.0, clock=clock)
ITEMS = 10
for i in range(ITEMS):
cache[i] = 'foobar-%d' % i
self.assertTrue(cache)
clock.now = 1.1
self.assertFalse(cache)
def test_nonzero_partial_expiration(self):
clock = FakeClock(0.0)
cache = utils.ExpiringCache(ttl=2.0, clock=clock)
cache['a'] = 1
clock.now = 1.0
self.assertTrue(cache)
cache['b'] = 2
clock.now = 2.0
self.assertTrue(cache)
clock.now = 3.0
self.assertFalse(cache)
def setUp(self):
self.cache = utils.ExpiringCache(ttl=20)