def test_add(self):
s = HashSet()
assert s.add('S') == True
assert s.add('H') == True
assert s.add('A') == True
assert s.size() == 3
assert s.add('A') == False
assert s.add('H') == False
assert s.add('S') == False
assert s.size() == 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')
def test_init(self):
elements = ['S', 'H', 'A', 'U', 'N', 'E', 'L', 'L']
s = HashSet(elements)
assert s.ht.length() == 7
assert s.size() == 7
