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"""Unit test for KNX DPT 1 byte relative value objects."""
import pytest
from xknx.dpt import DPTArray, DPTPercentV8, DPTSignedRelativeValue, DPTValue1Count
from xknx.exceptions import ConversionError
class TestDPTRelativeValue:
"""Test class for KNX DPT Relative Value."""
@pytest.mark.parametrize(
("raw", "value"),
[
((0x00,), 0),
((0x01,), 1),
((0x02,), 2),
((0x64,), 100),
((0x7F,), 127),
((0x80,), -128),
((0x9C,), -100),
((0xFE,), -2),
((0xFF,), -1),
],
)
def test_transcoder(self, raw: tuple[int], value: int) -> None:
"""Test value from and to KNX."""
assert DPTSignedRelativeValue.from_knx(DPTArray(raw)) == value
assert DPTSignedRelativeValue.to_knx(value) == DPTArray(raw)
def test_assert_min_exceeded(self) -> None:
"""Test initialization with wrong value (Underflow)."""
with pytest.raises(ConversionError):
DPTSignedRelativeValue.to_knx(-129)
def test_assert_max_exceeded(self) -> None:
"""Test initialization with wrong value (Overflow)."""
with pytest.raises(ConversionError):
DPTSignedRelativeValue.to_knx(128)
def test_unit(self) -> None:
"""Test unit of 1 byte relative value objects."""
assert DPTSignedRelativeValue.unit is None
assert DPTPercentV8.unit == "%"
assert DPTValue1Count.unit == "counter pulses"
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