def test_node_get_membership_at_level():
node = SGNode(1234)
assert node.get_membership_at_level(0) == 0
assert node.get_membership_at_level(1) == 1
assert node.get_membership_at_level(2) == 3
assert node.get_membership_at_level(3) == 3
assert node.get_membership_at_level(4) == 11
def test_node_membership_vector(key, level):
node = SGNode(key)
membership_vector = node.get_membership_at_level(level)
assert membership_vector.bit_length() <= level