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#!/usr/bin/env python
#
# This file is part of pySerial - Cross platform serial port support for Python
# (C) 2017 Chris Liechti <cliechti@gmx.net>
#
# SPDX-License-Identifier: BSD-3-Clause
"""\
Tests for exclusive access feature.
"""
import os
import unittest
import sys
import serial
# on which port should the tests be performed:
PORT = 'loop://'
class Test_exclusive(unittest.TestCase):
"""Test serial port locking"""
def setUp(self):
with serial.serial_for_url(PORT, do_not_open=True) as x:
if not isinstance(x, serial.Serial):
raise unittest.SkipTest("exclusive test only compatible with real serial port")
def test_exclusive_none(self):
"""test for exclusive=None"""
with serial.Serial(PORT, exclusive=None):
pass # OK
@unittest.skipUnless(os.name == 'posix', "exclusive=False not supported on platform")
def test_exclusive_false(self):
"""test for exclusive=False"""
with serial.Serial(PORT, exclusive=False):
pass # OK
@unittest.skipUnless(os.name in ('posix', 'nt'), "exclusive=True setting not supported on platform")
def test_exclusive_true(self):
"""test for exclusive=True"""
with serial.Serial(PORT, exclusive=True):
with self.assertRaises(serial.SerialException):
serial.Serial(PORT, exclusive=True) # fails to open twice
@unittest.skipUnless(os.name == 'nt', "platform is not restricted to exclusive=True (and None)")
def test_exclusive_only_true(self):
"""test if exclusive=False is not supported"""
with self.assertRaises(ValueError):
serial.Serial(PORT, exclusive=False) # expected to fail: False not supported
if __name__ == '__main__':
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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