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#!/usr/bin/env python
"""
This module is testing the serial interface.
Copyright: 2017 Boris Wenzlaff
"""
import unittest
from unittest.mock import patch
import can
from can.interfaces.serial.serial_can import SerialBus
from .config import IS_PYPY
from .message_helper import ComparingMessagesTestCase
# Mentioned in #1010
TIMEOUT = 0.5 if IS_PYPY else 0.1 # 0.1 is the default set in SerialBus
class SerialDummy:
"""
Dummy to mock the serial communication
"""
msg = None
def __init__(self):
self.msg = bytearray()
def read(self, size=1):
return_value = bytearray()
for i in range(size):
return_value.append(self.msg.pop(0))
return bytes(return_value)
def write(self, msg):
self.msg = bytearray(msg)
def reset(self):
self.msg = None
class SimpleSerialTestBase(ComparingMessagesTestCase):
MAX_TIMESTAMP = 0xFFFFFFFF / 1000
def __init__(self):
ComparingMessagesTestCase.__init__(
self, allowed_timestamp_delta=None, preserves_channel=True
)
def test_can_protocol(self):
self.assertEqual(self.bus.protocol, can.CanProtocol.CAN_20)
def test_rx_tx_min_max_data(self):
"""
Tests the transfer from 0x00 to 0xFF for a 1 byte payload
"""
for b in range(0, 255):
msg = can.Message(data=[b])
self.bus.send(msg)
msg_receive = self.bus.recv()
self.assertMessageEqual(msg, msg_receive)
def test_rx_tx_min_max_dlc(self):
"""
Tests the transfer from a 1 - 8 byte payload
"""
payload = bytearray()
for b in range(1, 9):
payload.append(0)
msg = can.Message(data=payload)
self.bus.send(msg)
msg_receive = self.bus.recv()
self.assertMessageEqual(msg, msg_receive)
def test_rx_tx_data_none(self):
"""
Tests the transfer without payload
"""
msg = can.Message(data=None)
self.bus.send(msg)
msg_receive = self.bus.recv()
self.assertMessageEqual(msg, msg_receive)
def test_rx_tx_min_id(self):
"""
Tests the transfer with the lowest arbitration id
"""
msg = can.Message(arbitration_id=0)
self.bus.send(msg)
msg_receive = self.bus.recv()
self.assertMessageEqual(msg, msg_receive)
def test_rx_tx_max_id(self):
"""
Tests the transfer with the highest arbitration id
"""
msg = can.Message(arbitration_id=536870911)
self.bus.send(msg)
msg_receive = self.bus.recv()
self.assertMessageEqual(msg, msg_receive)
def test_rx_tx_max_timestamp(self):
"""
Tests the transfer with the highest possible timestamp
"""
msg = can.Message(timestamp=self.MAX_TIMESTAMP)
self.bus.send(msg)
msg_receive = self.bus.recv()
self.assertMessageEqual(msg, msg_receive)
self.assertEqual(msg.timestamp, msg_receive.timestamp)
def test_rx_tx_max_timestamp_error(self):
"""
Tests for an exception with an out of range timestamp (max + 1)
"""
msg = can.Message(timestamp=self.MAX_TIMESTAMP + 1)
self.assertRaises(ValueError, self.bus.send, msg)
def test_rx_tx_min_timestamp(self):
"""
Tests the transfer with the lowest possible timestamp
"""
msg = can.Message(timestamp=0)
self.bus.send(msg)
msg_receive = self.bus.recv()
self.assertMessageEqual(msg, msg_receive)
self.assertEqual(msg.timestamp, msg_receive.timestamp)
def test_rx_tx_min_timestamp_error(self):
"""
Tests for an exception with an out of range timestamp (min - 1)
"""
msg = can.Message(timestamp=-1)
self.assertRaises(ValueError, self.bus.send, msg)
def test_when_no_fileno(self):
"""
Tests for the fileno method catching the missing pyserial implementeation on the Windows platform
"""
try:
fileno = self.bus.fileno()
except NotImplementedError:
pass # allow it to be left non-implemented for Windows platform
else:
fileno.__gt__ = (
lambda self, compare: True
) # Current platform implements fileno, so get the mock to respond to a greater than comparison
self.assertIsNotNone(fileno)
self.assertFalse(
fileno == -1
) # forcing the value to -1 is the old way of managing fileno on Windows but it is not compatible with notifiers
self.assertTrue(fileno > 0)
class SimpleSerialTest(unittest.TestCase, SimpleSerialTestBase):
def __init__(self, *args, **kwargs):
unittest.TestCase.__init__(self, *args, **kwargs)
SimpleSerialTestBase.__init__(self)
def setUp(self):
self.patcher = patch("serial.Serial")
self.mock_serial = self.patcher.start()
self.serial_dummy = SerialDummy()
self.mock_serial.return_value.write = self.serial_dummy.write
self.mock_serial.return_value.read = self.serial_dummy.read
self.addCleanup(self.patcher.stop)
self.bus = SerialBus("bus", timeout=TIMEOUT)
def tearDown(self):
self.serial_dummy.reset()
class SimpleSerialLoopTest(unittest.TestCase, SimpleSerialTestBase):
def __init__(self, *args, **kwargs):
unittest.TestCase.__init__(self, *args, **kwargs)
SimpleSerialTestBase.__init__(self)
def setUp(self):
self.bus = SerialBus("loop://", timeout=TIMEOUT)
def tearDown(self):
self.bus.shutdown()
if __name__ == "__main__":
unittest.main()
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