import os, sys
sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__)))+'/pyModeS')
import util


def test_hex2bin():
    assert util.hex2bin('6E406B') == "011011100100000001101011"


def test_crc_decode():
    checksum = util.crc("8D406B902015A678D4D220AA4BDA")
    assert checksum == "000000000000000000000000"


def test_crc_encode():
    parity = util.crc("8D406B902015A678D4D220AA4BDA", encode=True)
    assert util.hex2bin("AA4BDA") == parity