def test_hash_table():
ht = HashTable()
print('hash table: {}'.format(ht))
print('\nTesting set:')
for key, value in [('I', 1), ('V', 5), ('X', 10)]:
print('set({!r}, {!r})'.format(key, value))
ht.set(key, value)
print('hash table: {}'.format(ht))
print('\nTesting get:')
for key in ['I', 'V', 'X']:
value = ht.get(key)
print('get({!r}): {!r}'.format(key, value))
print('contains({!r}): {}'.format('X', ht.contains('X')))
print('length: {}'.format(ht.length()))
# Enable this after implementing delete method
delete_implemented = False
if delete_implemented:
print('\nTesting delete:')
for key in ['I', 'V', 'X']:
print('delete({!r})'.format(key))
ht.delete(key)
print('hash table: {}'.format(ht))
print('contains(X): {}'.format(ht.contains('X')))
print('length: {}'.format(ht.length()))
def test_delete(self):
ht = HashTable()
ht.set('I', 1)
ht.set('V', 5)
ht.set('X', 10)
assert ht.length() == 3
ht.delete('I')
ht.delete('X')
assert ht.length() == 1
with self.assertRaises(KeyError):
ht.delete('X') # Key no longer exists
with self.assertRaises(KeyError):
ht.delete('A') # Key does not exist