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"""Unit test for KNX 8 byte signed objects."""
import pytest
from xknx.dpt import DPT8ByteSigned, DPTArray
from xknx.exceptions import ConversionError
class TestDPT8ByteSigned:
"""Test class for KNX 8 byte signed objects."""
@pytest.mark.parametrize(
("raw", "expected"),
(
(b"\x00\x00\x00\x00\x00\x00\x00\x00", 0),
(b"\x00\x00\x00\x00\x00\x00\x00\x01", 1),
(b"\x00\x00\x00\x00\x00\x00\x00\xe6", 230),
(b"\xff\xff\xff\xff\xff\xff\xff\x1a", -230),
# limits
(b"\x7f\xff\xff\xff\xff\xff\xff\xff", 9_223_372_036_854_775_807),
(b"\x80\x00\x00\x00\x00\x00\x00\x00", -9_223_372_036_854_775_808),
),
)
def test_values(self, raw: bytes, expected: int) -> None:
"""Test valid values."""
assert DPT8ByteSigned.to_knx(expected) == DPTArray(raw)
assert DPT8ByteSigned.from_knx(DPTArray(raw)) == expected
@pytest.mark.parametrize(
"value", (9_223_372_036_854_775_808, -9_223_372_036_854_775_809)
)
def test_exceeding_limits(self, value: int) -> None:
"""Test invalid values."""
with pytest.raises(ConversionError):
DPT8ByteSigned.to_knx(value)
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