def test_prune_cardinality(self):
ht = HashTable(buckets=8)
ht.update({'a': 3, 'b': 2, 'c': 4, 'd': 1, 'e': 5, 'f': 6})
ht.update("xbgbbd")
self.assertEqual(ht.cardinality(), 8)
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)
class HashTableItemsTest(unittest.TestCase):
"""
Functional tests for determining size (cardinality) of hashtable and iterations.
"""
def setUp(self):
self.ht = HashTable(buckets=64)
def test_simple_length_test(self):
self.assertEqual(len(self.ht), 0)
self.ht.update("boss")
self.assertEqual(len(self.ht), 3)
self.ht.update("sad")
self.assertEqual(len(self.ht), 5)
def test_simple_cardinality_test(self):
self.assertEqual(self.ht.cardinality(), 0)
self.ht.update("boss")
self.assertEqual(self.ht.cardinality(), 3)
self.ht.update("sad")
self.assertEqual(self.ht.cardinality(), 5)
def test_delete_length_test(self):
self.ht.update("boss")
self.assertEqual(len(self.ht), 3)
del self.ht['s']
self.assertEqual(len(self.ht), 2)
del self.ht['s']
self.assertEqual(len(self.ht), 2)
def test_delete_prune_length_iteration_test(self):
self.ht = HashTable(buckets=8)
self.ht.update("bbboss")
self.assertEqual(len(self.ht), 3)
del self.ht['s']
self.assertEqual(len(self.ht), 2)
self.ht.update("122333")
self.assertEqual(len(self.ht), 5)
# should iterate over 5 elements
self.assertEqual(set(self.ht.items()),
set({
'b': 3,
'o': 1,
'1': 1,
'2': 2,
'3': 3
}.items()))
# the next add will overflow because the deleted bucket is still physically there so the 'real' size is 5
self.ht.update("!") # overflow removes '1', 'o', and the empty bucket
self.assertEqual(len(self.ht), 4)
# should iterate over 4 elements
self.assertEqual(set(self.ht.items()),
set({
'b': 3,
'!': 1,
'2': 2,
'3': 3
}.items()))
self.assertEqual(self.ht.cardinality(), 7)
