def test_set_and_get(self):
ht = HashTable()
ht.set('I', 1)
ht.set('V', 5)
ht.set('X', 10)
assert ht.get('I') == 1
assert ht.get('V') == 5
assert ht.get('X') == 10
assert ht.length() == 3
with self.assertRaises(KeyError):
ht.get('A') # Key does not exist
def test_contains(self):
ht = HashTable()
ht.set('I', 1)
ht.set('V', 5)
ht.set('X', 10)
assert ht.contains('I') is True
assert ht.contains('V') is True
assert ht.contains('X') is True
assert ht.contains('A') is False
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
def test_set_twice_and_get(self):
ht = HashTable()
ht.set('I', 1)
ht.set('V', 4)
ht.set('X', 9)
assert ht.length() == 3
ht.set('V', 5) # Update value
ht.set('X', 10) # Update value
assert ht.get('I') == 1
assert ht.get('V') == 5
assert ht.get('X') == 10
assert ht.length() == 3 # Check length is not overcounting
def test_length(self):
ht = HashTable()
assert ht.length() == 0
ht.set('I', 1)
assert ht.length() == 1
ht.set('V', 5)
assert ht.length() == 2
ht.set('X', 10)
assert ht.length() == 3
def test_items(self):
ht = HashTable()
assert ht.items() == []
ht.set('I', 1)
assert ht.items() == [['I', 1]]
ht.set('V', 5)
self.assertCountEqual(ht.items(), [['I', 1], ['V', 5]])
ht.set('X', 10)
self.assertCountEqual(ht.items(), [['I', 1], ['V', 5], ['X', 10]])
def test_values(self):
ht = HashTable()
assert ht.values() == []
ht.set('I', 1)
assert ht.values() == [1]
ht.set('V', 5)
self.assertCountEqual(ht.values(), [1, 5]) # Ignore item order
ht.set('X', 10)
self.assertCountEqual(ht.values(), [1, 5, 10]) # Ignore item order
def test_keys(self):
ht = HashTable()
assert ht.keys() == []
ht.set('I', 1)
assert ht.keys() == ['I']
ht.set('V', 5)
self.assertCountEqual(ht.keys(), ['I', 'V']) # Ignore item order
ht.set('X', 10)
self.assertCountEqual(ht.keys(), ['I', 'V', 'X']) # Ignore item order
def test_init(self):
ht = HashTable(4)
assert len(ht.buckets) == 4
assert ht.length() == 0