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#!/usr/bin/env python
#
# This file is part of pySerial - Cross platform serial port support for Python
# (C) 2015 Chris Liechti <cliechti@gmx.net>
#
# SPDX-License-Identifier: BSD-3-Clause
"""\
Test RS485 related functionality.
"""
import unittest
import serial
import serial.rs485
# on which port should the tests be performed:
PORT = 'loop://'
class Test_RS485_settings(unittest.TestCase):
"""Test RS485 related functionality"""
def setUp(self):
# create a closed serial port
self.s = serial.serial_for_url(PORT, do_not_open=True)
def tearDown(self):
self.s.close()
def test_enable_RS485(self):
# XXX open() port - but will result in fail for most HW...
#~ self.s.open()
self.assertEqual(self.s._rs485_mode, None, 'RS485 is disabled by default')
self.assertEqual(self.s.rs485_mode, None, 'RS485 is disabled by default')
self.s.rs485_mode = serial.rs485.RS485Settings()
self.assertTrue(self.s._rs485_mode is not None, 'RS485 is enabled')
self.assertTrue(self.s.rs485_mode is not None, 'RS485 is enabled')
self.s.rs485_mode = None
self.assertEqual(self.s._rs485_mode, None, 'RS485 is disabled again')
self.assertEqual(self.s.rs485_mode, None, 'RS485 is disabled again')
class Test_RS485_class(unittest.TestCase):
"""Test RS485 class"""
def setUp(self):
if not isinstance(serial.serial_for_url(PORT), serial.Serial):
raise unittest.SkipTest("RS485 test only compatible with real serial port")
self.s = serial.rs485.RS485(PORT, timeout=1)
def tearDown(self):
self.s.close()
def test_RS485_class(self):
self.s.rs485_mode = serial.rs485.RS485Settings()
self.s.write(b'hello')
self.assertEqual(self.s.read(5), b'hello')
if __name__ == '__main__':
import sys
sys.stdout.write(__doc__)
if len(sys.argv) > 1:
PORT = sys.argv[1]
sys.stdout.write("Testing port: {!r}\n".format(PORT))
sys.argv[1:] = ['-v']
# When this module is executed from the command-line, it runs all its tests
unittest.main()
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