def test_quality_default(self):
ht = HashTable(buckets=1024)
"""
Uses the default structure
"""
self.assertEqual(ht.quality(), 0)
for i in range(512):
ht.increment(str(i), 1 + (i % 13))
self.assertAlmostEqual(ht.quality(), 2.0 / 3)
for i in range(1024):
ht.increment(str(1024 + i), 1 + (i % 17))
self.assertAlmostEqual(ht.quality(), 2.0, delta=0.015)
class HashTablePickleTest(unittest.TestCase):
"""
Functional tests for determining size (cardinality) of hashtable and iterations.
"""
def setUp(self):
self.ht = HashTable(buckets=64)
def tearDown(self):
if os.path.isfile(filename):
os.remove(filename)
def check_hashtable(self, reloaded):
self.assertEqual(len(reloaded), len(self.ht))
self.assertEqual(reloaded.buckets(), self.ht.buckets())
self.assertEqual(reloaded.total(), self.ht.total())
self.assertEqual(set(reloaded.items()), set(self.ht.items()))
self.assertEqual(reloaded.quality(), self.ht.quality())
self.assertEqual(reloaded.cardinality(), self.ht.cardinality())
def store_and_load(self):
with open(filename, 'wb') as outfile:
pickle.dump(self.ht, outfile)
with open(filename, 'rb') as outfile:
reloaded = pickle.load(outfile)
return reloaded
def test_pickle_empty(self):
reloaded = self.store_and_load()
self.check_hashtable(reloaded)
def test_pickle_simple(self):
self.ht.update("boss")
self.ht.update("pickling")
reloaded = self.store_and_load()
self.check_hashtable(reloaded)
def test_pickle_deleted(self):
self.ht.update("boss")
self.ht.update("pickling")
del self.ht['g']
del self.ht['s']
reloaded = self.store_and_load()
self.check_hashtable(reloaded)
def test_pickle_pruned(self):
for i in range(120):
self.ht.increment(str(i), 1 + ((i * 27) % 17))
reloaded = self.store_and_load()
self.check_hashtable(reloaded)
def test_pickle_large(self):
self.ht = HashTable(buckets=2 ** 25)
self.ht.update("boss")
self.ht.update("pickling")
self.ht.update("verylargetable")
reloaded = self.store_and_load()
self.check_hashtable(reloaded)