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"""Unit test for KNX 2 byte signed objects."""
import struct
from unittest.mock import patch
import pytest
from xknx.dpt import DPT2ByteSigned, DPTArray
from xknx.exceptions import ConversionError, CouldNotParseTelegram
class TestDPT2ByteSigned:
"""Test class for KNX 2 byte signed objects."""
def test_signed_settings(self) -> None:
"""Test members of DPT2ByteSigned."""
assert DPT2ByteSigned.value_min == -32768
assert DPT2ByteSigned.value_max == 32767
def test_signed_assert_min_exceeded(self) -> None:
"""Test initialization of DPT2ByteSigned with wrong value (Underflow)."""
with pytest.raises(ConversionError):
DPT2ByteSigned.to_knx(-32769)
def test_signed_to_knx_exceed_limits(self) -> None:
"""Test initialization of DPT2ByteSigned with wrong value (Overflow)."""
with pytest.raises(ConversionError):
DPT2ByteSigned.to_knx(32768)
def test_signed_value_max_value(self) -> None:
"""Test DPT2ByteSigned parsing and streaming."""
assert DPT2ByteSigned.to_knx(32767) == DPTArray((0x7F, 0xFF))
assert DPT2ByteSigned.from_knx(DPTArray((0x7F, 0xFF))) == 32767
def test_signed_value_min_value(self) -> None:
"""Test DPT2ByteSigned parsing and streaming with null values."""
assert DPT2ByteSigned.to_knx(-20480) == DPTArray((0xB0, 0x00))
assert DPT2ByteSigned.from_knx(DPTArray((0xB0, 0x00))) == -20480
def test_signed_value_0123(self) -> None:
"""Test DPT2ByteSigned parsing and streaming."""
assert DPT2ByteSigned.to_knx(291) == DPTArray((0x01, 0x23))
assert DPT2ByteSigned.from_knx(DPTArray((0x01, 0x23))) == 291
def test_signed_wrong_value_from_knx(self) -> None:
"""Test DPT2ByteSigned parsing with wrong value."""
with pytest.raises(CouldNotParseTelegram):
DPT2ByteSigned.from_knx(DPTArray((0xFF, 0x4E, 0x12)))
def test_from_knx_unpack_error(self) -> None:
"""Test DPT2ByteSigned parsing with unpack error."""
with patch("struct.unpack") as unpack_mock:
unpack_mock.side_effect = struct.error()
with pytest.raises(ConversionError):
DPT2ByteSigned.from_knx(DPTArray((0x01, 0x23)))
def test_to_knx_pack_error(self) -> None:
"""Test serializing DPT2ByteSigned with pack error."""
with patch("struct.pack") as pack_mock:
pack_mock.side_effect = struct.error()
with pytest.raises(ConversionError):
DPT2ByteSigned.to_knx(1234)
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