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columba/python/test_rnode_interface.py
torlando-tech cf49225939 fix: Python RNode interface thread safety and CI improvements 
- Add lock around self.online status in _set_online() and process_outgoing()
  to prevent frame loss during online/offline transitions
- Add lock around RSSI/SNR updates for consistency with other radio state
- Log warning for malformed KISS escape sequences instead of silent ignore
- Add Python unit tests for thread safety fixes (6 new tests, 68 total)
- Add Python pytest step to CI workflow before Gradle tests

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2025-12-09 13:58:30 -05:00

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"""
Unit tests for rnode_interface.py
Tests KISS protocol escaping/unescaping, configuration validation,
and firmware version validation.
"""
import pytest
import sys
from unittest.mock import MagicMock, patch
# Mock RNS before importing rnode_interface
sys.modules['RNS'] = MagicMock()
from rnode_interface import KISS, ColumbaRNodeInterface
class TestKISSEscape:
"""Tests for KISS.escape() byte escaping."""
def test_escape_fend(self):
"""FEND (0xC0) should be escaped to 0xDB 0xDC."""
data = bytes([0xC0])
escaped = KISS.escape(data)
assert escaped == bytes([0xDB, 0xDC])
def test_escape_fesc(self):
"""FESC (0xDB) should be escaped to 0xDB 0xDD."""
data = bytes([0xDB])
escaped = KISS.escape(data)
assert escaped == bytes([0xDB, 0xDD])
def test_escape_mixed_special_bytes(self):
"""Multiple special bytes should all be escaped."""
data = bytes([0xC0, 0xDB, 0xC0])
escaped = KISS.escape(data)
# 0xDB must be escaped first, then 0xC0
assert escaped == bytes([0xDB, 0xDC, 0xDB, 0xDD, 0xDB, 0xDC])
def test_escape_no_special_bytes(self):
"""Data without special bytes should pass through unchanged."""
data = bytes([0x00, 0x01, 0x02, 0xFF])
escaped = KISS.escape(data)
assert escaped == data
def test_escape_empty_data(self):
"""Empty data should return empty."""
data = bytes()
escaped = KISS.escape(data)
assert escaped == bytes()
def test_escape_all_fend(self):
"""All FEND bytes should be escaped."""
data = bytes([0xC0, 0xC0, 0xC0])
escaped = KISS.escape(data)
assert escaped == bytes([0xDB, 0xDC, 0xDB, 0xDC, 0xDB, 0xDC])
class TestKISSUnescape:
"""Tests for KISS.unescape() byte unescaping."""
def test_unescape_fend(self):
"""0xDB 0xDC should be unescaped to FEND (0xC0)."""
data = bytes([0xDB, 0xDC])
unescaped = KISS.unescape(data)
assert unescaped == bytes([0xC0])
def test_unescape_fesc(self):
"""0xDB 0xDD should be unescaped to FESC (0xDB)."""
data = bytes([0xDB, 0xDD])
unescaped = KISS.unescape(data)
assert unescaped == bytes([0xDB])
def test_unescape_mixed(self):
"""Multiple escape sequences should all be unescaped."""
data = bytes([0xDB, 0xDC, 0xDB, 0xDD, 0xDB, 0xDC])
unescaped = KISS.unescape(data)
assert unescaped == bytes([0xC0, 0xDB, 0xC0])
def test_unescape_no_escape_sequences(self):
"""Data without escape sequences should pass through unchanged."""
data = bytes([0x00, 0x01, 0x02, 0xFF])
unescaped = KISS.unescape(data)
assert unescaped == data
def test_unescape_empty_data(self):
"""Empty data should return empty."""
data = bytes()
unescaped = KISS.unescape(data)
assert unescaped == bytes()
class TestKISSRoundTrip:
"""Tests for escape/unescape round-trip consistency."""
def test_roundtrip_special_bytes(self):
"""escape(unescape(x)) should equal x for escaped data."""
original_unescaped = bytes([0xC0, 0xDB, 0x00, 0xFF])
escaped = KISS.escape(original_unescaped)
roundtrip = KISS.unescape(escaped)
assert roundtrip == original_unescaped
def test_roundtrip_random_data(self):
"""Round-trip should work for arbitrary byte sequences."""
original = bytes(range(256))
escaped = KISS.escape(original)
roundtrip = KISS.unescape(escaped)
assert roundtrip == original
class TestKISSErrorMessages:
"""Tests for KISS.get_error_message()."""
def test_error_initradio(self):
"""Error 0x01 should return radio initialization message."""
msg = KISS.get_error_message(0x01)
assert "Radio initialization failed" in msg
def test_error_txfailed(self):
"""Error 0x02 should return transmission failed message."""
msg = KISS.get_error_message(0x02)
assert "Transmission failed" in msg
def test_error_queue_full(self):
"""Error 0x04 should return queue overflow message."""
msg = KISS.get_error_message(0x04)
assert "queue" in msg.lower()
def test_error_invalid_config(self):
"""Error 0x40 should return config error with TX power hint."""
msg = KISS.get_error_message(0x40)
assert "Invalid configuration" in msg
assert "TX power" in msg
def test_error_unknown(self):
"""Unknown error codes should return hex representation."""
msg = KISS.get_error_message(0xFF)
assert "0xFF" in msg or "Unknown" in msg
class TestValidateConfig:
"""Tests for ColumbaRNodeInterface._validate_config()."""
def create_interface(self, **overrides):
"""Create a test interface with mocked dependencies."""
config = {
'target_device_name': 'RNode Test',
'connection_mode': 'ble',
'frequency': 915000000,
'bandwidth': 250000,
'txpower': 17,
'sf': 11,
'cr': 5,
'st_alock': None,
'lt_alock': None,
'mode': 'full',
'enable_framebuffer': True,
}
config.update(overrides)
with patch.object(ColumbaRNodeInterface, '__init__', lambda x, *args: None):
iface = ColumbaRNodeInterface.__new__(ColumbaRNodeInterface)
iface.FREQ_MIN = 137000000
iface.FREQ_MAX = 3000000000
iface.frequency = config['frequency']
iface.txpower = config['txpower']
iface.bandwidth = config['bandwidth']
iface.sf = config['sf']
iface.cr = config['cr']
iface.st_alock = config['st_alock']
iface.lt_alock = config['lt_alock']
return iface
def test_valid_config(self):
"""Valid configuration should not raise."""
iface = self.create_interface()
iface._validate_config() # Should not raise
def test_frequency_below_min(self):
"""Frequency below 137 MHz should raise ValueError."""
iface = self.create_interface(frequency=100000000)
with pytest.raises(ValueError, match="frequency"):
iface._validate_config()
def test_frequency_above_max(self):
"""Frequency above 3000 MHz should raise ValueError."""
iface = self.create_interface(frequency=4000000000)
with pytest.raises(ValueError, match="frequency"):
iface._validate_config()
def test_frequency_at_min_boundary(self):
"""Frequency at 137 MHz (min) should be valid."""
iface = self.create_interface(frequency=137000000)
iface._validate_config() # Should not raise
def test_frequency_at_max_boundary(self):
"""Frequency at 3000 MHz (max) should be valid."""
iface = self.create_interface(frequency=3000000000)
iface._validate_config() # Should not raise
def test_txpower_negative(self):
"""Negative TX power should raise ValueError."""
iface = self.create_interface(txpower=-1)
with pytest.raises(ValueError, match="TX power"):
iface._validate_config()
def test_txpower_above_max(self):
"""TX power above 22 dBm should raise ValueError."""
iface = self.create_interface(txpower=25)
with pytest.raises(ValueError, match="TX power"):
iface._validate_config()
def test_txpower_at_max(self):
"""TX power at 22 dBm should be valid."""
iface = self.create_interface(txpower=22)
iface._validate_config() # Should not raise
def test_bandwidth_below_min(self):
"""Bandwidth below 7800 Hz should raise ValueError."""
iface = self.create_interface(bandwidth=5000)
with pytest.raises(ValueError, match="bandwidth"):
iface._validate_config()
def test_bandwidth_above_max(self):
"""Bandwidth above 1625000 Hz should raise ValueError."""
iface = self.create_interface(bandwidth=2000000)
with pytest.raises(ValueError, match="bandwidth"):
iface._validate_config()
def test_sf_below_min(self):
"""Spreading factor below 5 should raise ValueError."""
iface = self.create_interface(sf=4)
with pytest.raises(ValueError, match="spreading factor"):
iface._validate_config()
def test_sf_above_max(self):
"""Spreading factor above 12 should raise ValueError."""
iface = self.create_interface(sf=13)
with pytest.raises(ValueError, match="spreading factor"):
iface._validate_config()
def test_cr_below_min(self):
"""Coding rate below 5 should raise ValueError."""
iface = self.create_interface(cr=4)
with pytest.raises(ValueError, match="coding rate"):
iface._validate_config()
def test_cr_above_max(self):
"""Coding rate above 8 should raise ValueError."""
iface = self.create_interface(cr=9)
with pytest.raises(ValueError, match="coding rate"):
iface._validate_config()
def test_st_alock_negative(self):
"""Negative short-term airtime limit should raise ValueError."""
iface = self.create_interface(st_alock=-1.0)
with pytest.raises(ValueError, match="short-term airtime"):
iface._validate_config()
def test_st_alock_above_100(self):
"""Short-term airtime limit above 100% should raise ValueError."""
iface = self.create_interface(st_alock=101.0)
with pytest.raises(ValueError, match="short-term airtime"):
iface._validate_config()
def test_st_alock_valid(self):
"""Valid short-term airtime limit should not raise."""
iface = self.create_interface(st_alock=10.0)
iface._validate_config() # Should not raise
def test_lt_alock_negative(self):
"""Negative long-term airtime limit should raise ValueError."""
iface = self.create_interface(lt_alock=-0.1)
with pytest.raises(ValueError, match="long-term airtime"):
iface._validate_config()
def test_lt_alock_above_100(self):
"""Long-term airtime limit above 100% should raise ValueError."""
iface = self.create_interface(lt_alock=100.1)
with pytest.raises(ValueError, match="long-term airtime"):
iface._validate_config()
def test_alock_none_is_valid(self):
"""None airtime limits should be valid (disabled)."""
iface = self.create_interface(st_alock=None, lt_alock=None)
iface._validate_config() # Should not raise
class TestValidateFirmware:
"""Tests for ColumbaRNodeInterface._validate_firmware()."""
def create_interface_for_firmware(self, maj_version, min_version):
"""Create a test interface for firmware validation."""
with patch.object(ColumbaRNodeInterface, '__init__', lambda x, *args: None):
iface = ColumbaRNodeInterface.__new__(ColumbaRNodeInterface)
iface.REQUIRED_FW_VER_MAJ = 1
iface.REQUIRED_FW_VER_MIN = 52
iface.maj_version = maj_version
iface.min_version = min_version
iface.firmware_ok = False
return iface
def test_firmware_valid_exact_minimum(self):
"""Firmware 1.52 (exact minimum) should be valid."""
iface = self.create_interface_for_firmware(1, 52)
iface._validate_firmware()
assert iface.firmware_ok is True
def test_firmware_valid_higher_minor(self):
"""Firmware 1.100 should be valid."""
iface = self.create_interface_for_firmware(1, 100)
iface._validate_firmware()
assert iface.firmware_ok is True
def test_firmware_valid_higher_major(self):
"""Firmware 2.0 should be valid (major > required)."""
iface = self.create_interface_for_firmware(2, 0)
iface._validate_firmware()
assert iface.firmware_ok is True
def test_firmware_valid_much_higher_major(self):
"""Firmware 5.10 should be valid."""
iface = self.create_interface_for_firmware(5, 10)
iface._validate_firmware()
assert iface.firmware_ok is True
def test_firmware_invalid_low_minor(self):
"""Firmware 1.51 should be invalid (below 1.52)."""
iface = self.create_interface_for_firmware(1, 51)
iface._validate_firmware()
assert iface.firmware_ok is False
def test_firmware_invalid_low_major(self):
"""Firmware 0.99 should be invalid."""
iface = self.create_interface_for_firmware(0, 99)
iface._validate_firmware()
assert iface.firmware_ok is False
def test_firmware_invalid_zero(self):
"""Firmware 0.0 should be invalid."""
iface = self.create_interface_for_firmware(0, 0)
iface._validate_firmware()
assert iface.firmware_ok is False
def test_firmware_invalid_1_0(self):
"""Firmware 1.0 should be invalid."""
iface = self.create_interface_for_firmware(1, 0)
iface._validate_firmware()
assert iface.firmware_ok is False
class TestThreadSafety:
"""Tests for thread-safe read loop control using threading.Event."""
def create_interface(self):
"""Create a test interface with mocked dependencies."""
import threading
with patch.object(ColumbaRNodeInterface, '_get_kotlin_bridge'):
with patch.object(ColumbaRNodeInterface, '_validate_config'):
config = {
'frequency': 915000000,
'bandwidth': 125000,
'txpower': 17,
'sf': 8,
'cr': 5,
}
iface = ColumbaRNodeInterface.__new__(ColumbaRNodeInterface)
iface.frequency = config['frequency']
iface.bandwidth = config['bandwidth']
iface.txpower = config['txpower']
iface.sf = config['sf']
iface.cr = config['cr']
iface.st_alock = None
iface.lt_alock = None
iface.name = "test-rnode"
iface.target_device_name = "TestRNode"
iface.connection_mode = 0
iface.kotlin_bridge = None
iface.enable_framebuffer = False
iface.framebuffer_enabled = False
iface._read_thread = None
iface._running = threading.Event()
iface._read_lock = threading.Lock()
iface._reconnect_thread = None
iface._reconnecting = False
iface._max_reconnect_attempts = 30
iface._reconnect_interval = 10.0
iface._on_error_callback = None
iface._on_online_status_changed = None
return iface
def test_running_flag_is_threading_event(self):
"""_running should be a threading.Event for thread-safe signaling."""
import threading
iface = self.create_interface()
assert isinstance(iface._running, threading.Event)
def test_running_event_initially_not_set(self):
"""_running event should not be set on initialization."""
iface = self.create_interface()
assert not iface._running.is_set()
def test_running_event_can_be_set_and_cleared(self):
"""_running event should support set() and clear() operations."""
iface = self.create_interface()
# Initially not set
assert not iface._running.is_set()
# Set the event
iface._running.set()
assert iface._running.is_set()
# Clear the event
iface._running.clear()
assert not iface._running.is_set()
def test_running_event_thread_safe_signaling(self):
"""Verify threading.Event provides thread-safe stop signaling."""
import threading
import time
iface = self.create_interface()
loop_iterations = []
def mock_loop():
"""Simulate read loop behavior."""
while iface._running.is_set():
loop_iterations.append(1)
time.sleep(0.01)
# Start the event and thread
iface._running.set()
thread = threading.Thread(target=mock_loop)
thread.start()
# Let it run a bit
time.sleep(0.05)
# Clear event to stop the loop
iface._running.clear()
thread.join(timeout=1.0)
# Thread should have stopped cleanly
assert not thread.is_alive()
assert len(loop_iterations) > 0 # Loop ran at least once
class TestWriteRetry:
"""Tests for write retry with exponential backoff."""
def create_interface_for_write(self):
"""Create a test interface with mocked dependencies."""
import threading
with patch.object(ColumbaRNodeInterface, '_get_kotlin_bridge'):
with patch.object(ColumbaRNodeInterface, '_validate_config'):
iface = ColumbaRNodeInterface.__new__(ColumbaRNodeInterface)
iface.name = "test-rnode"
iface.kotlin_bridge = MagicMock()
return iface
def test_write_uses_exponential_backoff(self):
"""Write retry should use exponential backoff delays."""
import time
iface = self.create_interface_for_write()
test_data = b"test"
# Mock writeSync to always fail (return 0 bytes written)
iface.kotlin_bridge.writeSync.return_value = 0
sleep_calls = []
def mock_sleep(seconds):
sleep_calls.append(seconds)
# Don't actually sleep in tests
with patch('time.sleep', mock_sleep):
with pytest.raises(IOError):
iface._write(test_data)
# With 3 retries, we get 2 sleep calls between attempts
# Should have exponential backoff: 0.3s, 1.0s
assert len(sleep_calls) == 2
assert sleep_calls[0] == pytest.approx(0.3, rel=0.01)
assert sleep_calls[1] == pytest.approx(1.0, rel=0.01)
def test_write_succeeds_on_first_attempt(self):
"""Write should not retry if first attempt succeeds."""
import time
iface = self.create_interface_for_write()
test_data = b"test"
# Mock writeSync to succeed
iface.kotlin_bridge.writeSync.return_value = len(test_data)
sleep_calls = []
with patch('time.sleep', lambda s: sleep_calls.append(s)):
iface._write(test_data) # Should not raise
# No retries needed
assert len(sleep_calls) == 0
assert iface.kotlin_bridge.writeSync.call_count == 1
def test_write_succeeds_on_retry(self):
"""Write should succeed if a retry works."""
import time
iface = self.create_interface_for_write()
test_data = b"test"
# Mock writeSync to fail first, then succeed
iface.kotlin_bridge.writeSync.side_effect = [0, len(test_data)]
sleep_calls = []
with patch('time.sleep', lambda s: sleep_calls.append(s)):
iface._write(test_data) # Should not raise
# One retry delay
assert len(sleep_calls) == 1
assert iface.kotlin_bridge.writeSync.call_count == 2
class TestRadioStateThreadSafety:
"""Tests for thread-safe access to radio state variables (Issue 3)."""
def create_interface(self):
"""Create a test interface with mocked dependencies."""
import threading
with patch.object(ColumbaRNodeInterface, '_get_kotlin_bridge'):
with patch.object(ColumbaRNodeInterface, '_validate_config'):
iface = ColumbaRNodeInterface.__new__(ColumbaRNodeInterface)
iface.frequency = 915000000
iface.bandwidth = 125000
iface.txpower = 17
iface.sf = 8
iface.cr = 5
iface.st_alock = None
iface.lt_alock = None
iface.name = "test-rnode"
iface.target_device_name = "TestRNode"
iface.connection_mode = 0
iface.kotlin_bridge = None
iface.enable_framebuffer = False
iface.framebuffer_enabled = False
iface._read_thread = None
iface._running = threading.Event()
iface._read_lock = threading.Lock()
iface._reconnect_thread = None
iface._reconnecting = False
iface._max_reconnect_attempts = 30
iface._reconnect_interval = 10.0
iface._on_error_callback = None
iface._on_online_status_changed = None
# Radio state readback variables (these need thread safety)
iface.r_frequency = None
iface.r_bandwidth = None
iface.r_txpower = None
iface.r_sf = None
iface.r_cr = None
iface.r_state = None
iface.r_stat_rssi = None
iface.r_stat_snr = None
return iface
def test_radio_state_lock_exists(self):
"""Interface should have a _read_lock for thread-safe radio state access."""
import threading
iface = self.create_interface()
assert hasattr(iface, '_read_lock')
assert isinstance(iface._read_lock, type(threading.Lock()))
def test_radio_state_can_be_updated_safely(self):
"""Radio state variables should be accessible under lock."""
iface = self.create_interface()
# Simulate what the read loop does - update state under lock
with iface._read_lock:
iface.r_frequency = 915000000
iface.r_bandwidth = 250000
iface.r_sf = 11
iface.r_cr = 5
iface.r_state = 0x01 # RADIO_STATE_ON
# Read values (should be consistent)
with iface._read_lock:
assert iface.r_frequency == 915000000
assert iface.r_bandwidth == 250000
assert iface.r_sf == 11
assert iface.r_cr == 5
assert iface.r_state == 0x01
def test_concurrent_radio_state_access(self):
"""Concurrent reads and writes to radio state should not cause errors."""
import threading
import time
iface = self.create_interface()
errors = []
iterations = 100
def writer():
"""Simulate read loop updating state."""
for i in range(iterations):
with iface._read_lock:
iface.r_frequency = 915000000 + i
iface.r_bandwidth = 250000
iface.r_sf = 11
iface.r_cr = 5
time.sleep(0.001)
def reader():
"""Simulate _validate_radio_state reading state."""
for _ in range(iterations):
try:
with iface._read_lock:
# Read all values atomically
freq = iface.r_frequency
bw = iface.r_bandwidth
sf = iface.r_sf
cr = iface.r_cr
# Values should be consistent (all set or all None)
if freq is not None:
assert bw is not None
assert sf is not None
assert cr is not None
except Exception as e:
errors.append(e)
time.sleep(0.001)
# Run concurrent threads
writer_thread = threading.Thread(target=writer)
reader_thread = threading.Thread(target=reader)
writer_thread.start()
reader_thread.start()
writer_thread.join(timeout=5.0)
reader_thread.join(timeout=5.0)
assert len(errors) == 0, f"Concurrent access errors: {errors}"
class TestOnlineStatusThreadSafety:
"""Tests for thread-safe online status access (PR #36 critical fix)."""
def create_interface(self):
"""Create a test interface with mocked dependencies."""
import threading
with patch.object(ColumbaRNodeInterface, '_get_kotlin_bridge'):
with patch.object(ColumbaRNodeInterface, '_validate_config'):
iface = ColumbaRNodeInterface.__new__(ColumbaRNodeInterface)
iface.frequency = 915000000
iface.bandwidth = 125000
iface.txpower = 17
iface.sf = 8
iface.cr = 5
iface.st_alock = None
iface.lt_alock = None
iface.name = "test-rnode"
iface.target_device_name = "TestRNode"
iface.connection_mode = 0
iface.kotlin_bridge = MagicMock()
iface.kotlin_bridge.writeSync.return_value = 10
iface.enable_framebuffer = False
iface.framebuffer_enabled = False
iface._read_thread = None
iface._running = threading.Event()
iface._read_lock = threading.Lock()
iface._reconnect_thread = None
iface._reconnecting = False
iface._max_reconnect_attempts = 30
iface._reconnect_interval = 10.0
iface._on_error_callback = None
iface._on_online_status_changed = None
iface.online = False
iface.txb = 0
iface.r_stat_rssi = None
iface.r_stat_snr = None
return iface
def test_set_online_uses_lock(self):
"""_set_online should use _read_lock for thread-safe updates."""
iface = self.create_interface()
# Verify initial state
assert iface.online is False
# Set online
iface._set_online(True)
assert iface.online is True
# Set offline
iface._set_online(False)
assert iface.online is False
def test_process_outgoing_uses_lock(self):
"""process_outgoing should use _read_lock when checking online status."""
iface = self.create_interface()
iface.online = True
# Should not raise - online status should be readable
iface.process_outgoing(b"test data")
# Verify write was attempted
iface.kotlin_bridge.writeSync.assert_called()
def test_concurrent_online_status_access(self):
"""Concurrent reads/writes to online status should be thread-safe."""
import threading
import time
iface = self.create_interface()
errors = []
iterations = 200
def status_changer():
"""Simulate connection state changes."""
for i in range(iterations):
iface._set_online(i % 2 == 0)
time.sleep(0.001)
def sender():
"""Simulate sending data."""
for _ in range(iterations):
try:
iface.process_outgoing(b"test")
except IOError:
pass # Expected when offline
except Exception as e:
errors.append(e)
time.sleep(0.001)
changer_thread = threading.Thread(target=status_changer)
sender_thread = threading.Thread(target=sender)
changer_thread.start()
sender_thread.start()
changer_thread.join(timeout=5.0)
sender_thread.join(timeout=5.0)
assert len(errors) == 0, f"Thread safety errors: {errors}"
def test_online_status_callback_called_on_change(self):
"""_on_online_status_changed callback should be called when status changes."""
iface = self.create_interface()
callback_calls = []
def callback(is_online):
callback_calls.append(is_online)
iface._on_online_status_changed = callback
# Change from offline to online
iface._set_online(True)
assert callback_calls == [True]
# Change from online to offline
iface._set_online(False)
assert callback_calls == [True, False]
# Same status should not trigger callback
iface._set_online(False)
assert callback_calls == [True, False] # No new call
class TestRssiSnrThreadSafety:
"""Tests for thread-safe RSSI/SNR access (PR #36 critical fix)."""
def create_interface(self):
"""Create a test interface with mocked dependencies."""
import threading
with patch.object(ColumbaRNodeInterface, '_get_kotlin_bridge'):
with patch.object(ColumbaRNodeInterface, '_validate_config'):
iface = ColumbaRNodeInterface.__new__(ColumbaRNodeInterface)
iface._read_lock = threading.Lock()
iface.r_stat_rssi = None
iface.r_stat_snr = None
return iface
def test_rssi_snr_can_be_updated_under_lock(self):
"""RSSI and SNR should be updatable under lock."""
iface = self.create_interface()
with iface._read_lock:
iface.r_stat_rssi = -80
iface.r_stat_snr = 10.5
assert iface.r_stat_rssi == -80
assert iface.r_stat_snr == 10.5
class TestMalformedEscapeSequenceLogging:
"""Tests for malformed KISS escape sequence warning (PR #36 critical fix)."""
def test_escape_sequence_logging_documented(self):
"""Verify the fix documents invalid escape sequence handling.
The read loop at line 666-669 now logs a warning when FESC is followed
by an unexpected byte (not TFEND or TFESC). This test documents the
expected behavior.
"""
# This is a documentation test - the actual logging happens in _read_loop
# which requires a full mock of the read loop. We verify the KISS constants
# that define valid escape sequences.
assert KISS.FESC == 0xDB
assert KISS.TFEND == 0xDC
assert KISS.TFESC == 0xDD
# Any byte after FESC that is NOT TFEND (0xDC) or TFESC (0xDD)
# is considered invalid and will now be logged
class TestKISSConstants:
"""Tests for KISS protocol constants."""
def test_fend_value(self):
"""FEND should be 0xC0."""
assert KISS.FEND == 0xC0
def test_fesc_value(self):
"""FESC should be 0xDB."""
assert KISS.FESC == 0xDB
def test_tfend_value(self):
"""TFEND (escaped FEND) should be 0xDC."""
assert KISS.TFEND == 0xDC
def test_tfesc_value(self):
"""TFESC (escaped FESC) should be 0xDD."""
assert KISS.TFESC == 0xDD
def test_cmd_data_is_zero(self):
"""CMD_DATA should be 0x00."""
assert KISS.CMD_DATA == 0x00
def test_radio_states(self):
"""Radio states should have expected values."""
assert KISS.RADIO_STATE_OFF == 0x00
assert KISS.RADIO_STATE_ON == 0x01
assert KISS.RADIO_STATE_ASK == 0xFF
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