def test_size(self):
hs = HashSet([1, 2, 3])
assert hs.ht.size == 3
assert hs.size == 3
assert len(hs) == 3
hs.add(4)
assert hs.ht.size == 4
assert hs.size == 4
assert len(hs) == 4
hs.remove(2)
assert hs.ht.size == 3
assert hs.size == 3
assert len(hs) == 3
def test_remove(self):
hs = HashSet([1, 2, 3])
assert hs.items() == [1, 2, 3]
assert hs.contains(3) == True
assert hs.size == 3
# remove item
hs.remove(3)
assert hs.items() == [1, 2]
assert hs.contains(3) == False
assert hs.size == 2
with self.assertRaises(KeyError):
hs.remove(3)
def test_remove(self):
s = HashSet()
s.add('S')
s.add('H')
s.add('A')
s.remove('A')
assert s.size() == 2
s.remove('H')
assert s.size() == 1
s.remove('S')
assert s.size() == 0
with self.assertRaises(KeyError):
s.remove('S')