def test_crcelement_init_crc(crc: bytes) -> None:
"""Test CRCElement crc attr initialization."""
if (b'\x00\x00\x00\x00' <= crc <= b'\xff\xff\xff\xff') and (len(crc) == 4):
crcelements.CRCElement(crc=crc)
else:
with pt.raises(ValueError):
crcelements.CRCElement(crc=crc)
def test_crcelement_roundtrip(crc: bytes, payload: bytes, body: bytes) -> None:
"""Test CRCElement generate/parse roundtrip."""
generate_crc_element = crcelements.CRCElement()
generate_crc_element.crc = crc
generate_crc_element.payload = payload
generate_crc_element.parse(generate_crc_element.get_body())
assert generate_crc_element.crc == crc
assert generate_crc_element.payload == payload
parse_crc_element = crcelements.CRCElement()
parse_crc_element.parse(generate_crc_element.get_body())
assert parse_crc_element.crc == crc
assert parse_crc_element.payload == payload
assert parse_crc_element.get_body() == body
def test_crcelement_integrity_fail(crc: bytes, payload: bytes,
_: bytes) -> None:
"""Test CRCElement data integrity fail check."""
crc_element = crcelements.CRCElement()
crc_element.crc = crc
crc_element.payload = payload
with pt.raises(exceptions.ProtocolDataError):
crc_element.check_integrity()
def test_crcelement_integrity_pass(crc: bytes, payload: bytes,
_: bytes) -> None:
"""Test CRCElement data integrity pass check."""
crc_element = crcelements.CRCElement()
crc_element.crc = crc
crc_element.payload = payload
try:
crc_element.check_integrity()
except exceptions.ProtocolDataError as err:
pt.fail("Integrity check failed: {0}".format(err))
def test_crcelement_init_valid_crc(crc: bytes) -> None:
"""
Scenario: Valid CRC of data is generated/parsed from the input.
"""
# Given: A CRC constructor value which is within the allowed
# range for 32-bit CRCs
if (b'\x00\x00\x00\x00' <= crc <= b'\xff\xff\xff\xff') and (len(crc) == 4):
# When: A CRCElement is constructed using it.
# Then: ValueError should not be raised.
crcelements.CRCElement(crc=crc)
def test_crcelement_parse(crc: bytes, payload: bytes, body: bytes) -> None:
"""
Scenario: The system reads file/processes message from mcu/frontend.
"""
# Given: A CRC element.
crc_element = crcelements.CRCElement()
# When: The CRC Element parses a body of valid size.
crc_element.parse(body)
# Then: The CRC checksum is parsed correctly from the header.
# And: The payload is parsed correctly.
assert crc_element.crc == crc
assert crc_element.payload == payload
def test_crcelement_init_invalid_crc(crc: bytes) -> None: # pylint: disable=invalid-name
"""
Scenario: Invalid CRC of data is generated/parsed from the input.
"""
# Given: A CRC constructor value which is outside the allowed
# range for 32-bit CRCs
if not (
(b'\x00\x00\x00\x00' <= crc <= b'\xff\xff\xff\xff')\
and (len(crc) == 4)
):
# When: A CRCElement is constructed using it.
# Then: ValueError should be raised.
with pt.raises(ValueError):
crcelements.CRCElement(crc=crc)
def test_crcelement_integrity_pass(crc: bytes, payload: bytes,
_: bytes) -> None:
"""
Scenario: The system reads file/processes message from mcu/frontend.
The message has been parsed
"""
# Given: We have CRCElement object.
crc_element = crcelements.CRCElement()
crc_element.crc = crc
crc_element.payload = payload
try:
# When: The CRCElement object checks the integrity of a payload and
# the expected CRC, which are consistent with each other.
crc_element.check_integrity()
# Then: ProtocolDataError should not be raised.
except exceptions.ProtocolDataError as err:
pt.fail("Integrity check failed: {0}".format(err))
def test_crcelement_parse(crc: bytes, payload: bytes, body: bytes) -> None:
"""Test CRCElement parsing from body."""
crc_element = crcelements.CRCElement()
crc_element.parse(body)
assert crc_element.crc == crc
assert crc_element.payload == payload
def test_crcelement_invalid_crc_input(payload: bytes) -> None: # pylint: disable=invalid-name
"""Test CRCElement CRC-32C invalid input."""
crc_element = crcelements.CRCElement()
crc_element.payload = payload
with pt.raises(exceptions.ProtocolDataError):
_ = crc_element._compute_crc() # pylint: disable=protected-access
def test_crcelement_compute_crc(payload: bytes, expected: bytes) -> None:
"""Test CRCElement CRC-32C computation."""
crc_element = crcelements.CRCElement()
crc_element.payload = payload
assert crc_element._compute_crc() == expected # pylint: disable=protected-access
def test_crcelement_generate(crc: bytes, payload: bytes, body: bytes) -> None:
"""Test CRCElement generation of body."""
crc_element = crcelements.CRCElement()
crc_element.crc = crc
crc_element.payload = payload
assert crc_element.get_body() == body
def test_crcelement_parse_invalids(body: bytes) -> None:
"""Test CRCElement parse invalids."""
crc_element = crcelements.CRCElement()
with pt.raises(exceptions.ProtocolDataError):
crc_element.parse(body)
def test_crcelement_parse_invariants(crc: bytes, payload: bytes) -> None:
"""Test CRCElement parse invariants."""
crc_element = crcelements.CRCElement()
crc_element.parse(crc + payload)
assert crc_element.crc == crc
assert crc_element.payload == payload
