def test_union(self):
s1 = HashSet(['J', 'E', 'R', 'I'])
s2 = HashSet(['H', 'U', 'N', 'T'])
s3 = s1.union(s2)
assert s3.contains('J') == True
assert s3.contains('E') == True
assert s3.contains('R') == True
assert s3.contains('I') == True
assert s3.contains('H') == True
assert s3.contains('U') == True
assert s3.contains('N') == True
assert s3.contains('T') == True
assert s3.size() == 8
def test_union(self):
hs1 = HashSet([1, 2, 3, 4])
hs2 = HashSet([2, 3, 4, 5])
union = hs1.union(hs2)
assert union.items() == [1, 2, 3, 4, 5]