def _unpack_contents(contents, change_length=False, change_crc=False,
extend_contents=False):
header = create_frame_header(contents)
length, crc = header[:4], header[4:]
assert len(length) == len(crc)
if change_length:
length = chr(ord(length[0]) + 1) + length[1:]
if change_crc:
crc = chr(ord(crc[0]) + 1) + crc[1:]
if extend_contents:
contents += '\x01'
return unpack_frame_contents(length + crc + contents)
def test_frame_parsing():
for contens, frame in full_frames:
assert unpack_frame_contents(frame) == contens
