def test_build_operator_packet_by_length():
stream = parse_input_data(TEST_INPUT_OPERATOR_1)
packet = PacketFactory.build(stream)
assert isinstance(packet, OperatorPacket)
assert len(packet.subpackets) == 2
assert packet.subpackets[0].value == 10
assert packet.subpackets[1].value == 20
def test_version_sum_4():
stream = parse_input_data(TEST_INPUT_SUM_4)
packet = PacketFactory.build(stream)
total = packet.version_sum()
assert total == 31
def test_build_literal_packet():
stream = parse_input_data(TEST_INPUT_LITERAL)
packet = PacketFactory.build(stream)
assert isinstance(packet, LiteralPacket)
assert packet.value == 2021