def test_decode_nibbles_odd_no_pad() -> None:
spec = copy.deepcopy(iso8583.specs.default)
spec["t"]["data_enc"] = "ascii"
spec["p"]["data_enc"] = "ascii"
spec["2"]["data_enc"] = "b"
spec["2"]["len_enc"] = "bcd"
spec["2"]["len_type"] = 2
spec["2"]["max_len"] = 8
spec["2"]["len_count"] = "nibbles"
data = b"02004000000000000000\x00\x03\x12\x30"
with pytest.raises(
iso8583.DecodeError,
match="Field data is 4 nibbles, expecting 3: field 2 pos 22",
):
iso8583.decode(data, spec=spec)
def test_decode_nibbles_fixed_missing() -> None:
"""Fixed field is missing"""
spec = copy.deepcopy(iso8583.specs.default)
spec["t"]["data_enc"] = "ascii"
spec["p"]["data_enc"] = "ascii"
spec["2"]["data_enc"] = "ascii"
spec["2"]["len_enc"] = "ascii"
spec["2"]["len_type"] = 0
spec["2"]["max_len"] = 4
spec["2"]["len_count"] = "nibbles"
s = b"02004000000000000000"
with pytest.raises(
iso8583.DecodeError,
match="Field data is 0 nibbles, expecting 4: field 2 pos 20",
):
iso8583.decode(s, spec=spec)
def test_decode_nibbles_variable_partial() -> None:
"""Variable field is provided partially"""
spec = copy.deepcopy(iso8583.specs.default)
spec["t"]["data_enc"] = "ascii"
spec["p"]["data_enc"] = "ascii"
spec["2"]["data_enc"] = "ascii"
spec["2"]["len_enc"] = "ascii"
spec["2"]["len_type"] = 2
spec["2"]["max_len"] = 4
spec["2"]["len_count"] = "nibbles"
s = b"02004000000000000000041"
with pytest.raises(
iso8583.DecodeError,
match="Field data is 2 nibbles, expecting 4: field 2 pos 22",
):
iso8583.decode(s, spec=spec)
def test_decode_nibbles_variable_over_max() -> None:
"""Variable field length is over maximum allowed"""
spec = copy.deepcopy(iso8583.specs.default)
spec["t"]["data_enc"] = "ascii"
spec["p"]["data_enc"] = "ascii"
spec["2"]["data_enc"] = "ascii"
spec["2"]["len_enc"] = "ascii"
spec["2"]["len_type"] = 2
spec["2"]["max_len"] = 4
spec["2"]["len_count"] = "nibbles"
s = b"02004000000000000000081234"
with pytest.raises(
iso8583.DecodeError,
match="Field data is 8 nibbles, larger than maximum 4: field 2 pos 20",
):
iso8583.decode(s, spec=spec)
def test_decode_nibbles(
data_enc: str,
len_enc: str,
len_type: int,
max_len: int,
len_count: str,
data: bytes,
result_f2_len: bytes,
) -> None:
spec = copy.deepcopy(iso8583.specs.default)
spec["t"]["data_enc"] = "ascii"
spec["p"]["data_enc"] = "ascii"
spec["2"]["data_enc"] = data_enc
spec["2"]["len_enc"] = len_enc
spec["2"]["len_type"] = len_type
spec["2"]["max_len"] = max_len
spec["2"]["len_count"] = len_count
decoded, encoded = iso8583.decode(data, spec)
assert decoded["2"] == "1234"
assert encoded["2"]["len"] == result_f2_len
