73ff15c Oct 8, 2016
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#!/usr/bin/env python
# This file is part of pySerial - Cross platform serial port support for Python
# (C) 2001-2015 Chris Liechti <>
# SPDX-License-Identifier: BSD-3-Clause
"""Some tests for the serial module.
Part of pyserial ( (C)2002-2003
Intended to be run on different platforms, to ensure portability of
the code.
For all these tests a simple hardware is required.
Loopback HW adapter:
Shortcut these pin pairs:
TX <-> RX
On a 9 pole DSUB these are the pins (2-3) (4-6) (7-8)
import unittest
import sys
import serial
# on which port should the tests be performed:
PORT = 'loop://'
BAUDRATE = 115200
#~ BAUDRATE=9600
if sys.version_info >= (3, 0):
bytes_0to255 = bytes(range(256))
bytes_0to255 = ''.join([chr(x) for x in range(256)])
class TestHighLoad(unittest.TestCase):
"""Test sending and receiving large amount of data"""
N = 16
#~ N = 1
def setUp(self):
self.s = serial.serial_for_url(PORT, BAUDRATE, timeout=10)
def tearDown(self):
def test0_WriteReadLoopback(self):
"""Send big strings, write/read order."""
for i in range(self.N):
q = bytes_0to255
self.assertEqual(, q) # expected same which was written before
self.assertEqual(self.s.inWaiting(), 0) # expected empty buffer after all sent chars are read
def test1_WriteWriteReadLoopback(self):
"""Send big strings, multiple write one read."""
q = bytes_0to255
for i in range(self.N):
read = * self.N)
self.assertEqual(read, q * self.N, "expected what was written before. got {} bytes, expected {}".format(len(read), self.N * len(q)))
self.assertEqual(self.s.inWaiting(), 0) # "expected empty buffer after all sent chars are read")
if __name__ == '__main__':
import sys
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