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"""Unit test for KNX/IP TunnellingAck objects."""
import pytest
from xknx.exceptions import CouldNotParseKNXIP
from xknx.knxip import DisconnectRequest, KNXIPHeader, KNXIPServiceType
class TestKNXIPHeader:
"""Test class for KNX/IP Header objects."""
def test_from_knx(self) -> None:
"""Test parsing and streaming wrong Header (wrong length byte)."""
raw = bytes((0x06, 0x10, 0x04, 0x21, 0x00, 0x0A))
header = KNXIPHeader()
assert header.from_knx(raw) == 6
assert header.HEADERLENGTH == 6
assert header.PROTOCOLVERSION == 16
assert header.service_type_ident == KNXIPServiceType.TUNNELLING_ACK
assert header.total_length == 10
assert header.to_knx() == raw
def test_set_length(self) -> None:
"""Test setting length."""
header = KNXIPHeader()
header.set_length(DisconnectRequest())
# 6 (header) + 2 + 8 (HPAI length)
assert header.total_length == 16
def test_set_length_error(self) -> None:
"""Test setting length with wrong type."""
header = KNXIPHeader()
with pytest.raises(TypeError):
header.set_length(2)
def test_from_knx_wrong_header(self) -> None:
"""Test parsing and streaming wrong Header (wrong length)."""
raw = bytes((0x06, 0x10, 0x04, 0x21, 0x00))
header = KNXIPHeader()
with pytest.raises(CouldNotParseKNXIP):
header.from_knx(raw)
def test_from_knx_wrong_header2(self) -> None:
"""Test parsing and streaming wrong Header (wrong length byte)."""
raw = bytes((0x05, 0x10, 0x04, 0x21, 0x00, 0x0A))
header = KNXIPHeader()
with pytest.raises(CouldNotParseKNXIP):
header.from_knx(raw)
def test_from_knx_wrong_header3(self) -> None:
"""Test parsing and streaming wrong Header (wrong protocol version)."""
raw = bytes((0x06, 0x11, 0x04, 0x21, 0x00, 0x0A))
header = KNXIPHeader()
with pytest.raises(CouldNotParseKNXIP):
header.from_knx(raw)
def test_from_knx_wrong_header4(self) -> None:
"""Test parsing and streaming wrong Header (unsupported service type)."""
# 0x0000 as service type
raw = bytes((0x06, 0x10, 0x00, 0x00, 0x00, 0x0A))
header = KNXIPHeader()
with pytest.raises(CouldNotParseKNXIP):
header.from_knx(raw)
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