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# Python Serial Port Extension for Win32, Linux, BSD, Jython
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# (C) 2001-2008 Chris Liechti <cliechti@gmx.net>
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# this is distributed under a free software license, see license.txt
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Some tests for the serial module.
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Part of pyserial (http://pyserial.sf.net) (C)2001-2009 cliechti@gmx.net
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Intended to be run on different platforms, to ensure portability of
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For all these tests a simple hardware is required.
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Shortcut these pin pairs:
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On a 9 pole DSUB these are the pins (2-3) (4-6) (7-8)
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# on which port should the tests be performed:
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if sys.version_info >= (3, 0):
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return bytes(string, 'latin1')
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bytes_0to255 = bytes(range(256))
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def data(string): return string
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bytes_0to255 = ''.join([chr(x) for x in range(256)])
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def segments(data, size=16):
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for a in range(0, len(data), size):
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class Test4_Nonblocking(unittest.TestCase):
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"""Test with timeouts"""
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self.s = serial.serial_for_url(PORT, timeout=self.timeout)
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def test0_Messy(self):
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"""NonBlocking (timeout=0)"""
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# this is only here to write out the message in verbose mode
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# because Test3 and Test4 print the same messages
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def test1_ReadEmpty(self):
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"""timeout: After port open, the input buffer must be empty"""
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self.failUnlessEqual(self.s.read(1), data(''), "expected empty buffer")
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def test2_Loopback(self):
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"""timeout: each sent character should return (binary test).
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this is also a test for the binary capability of a port."""
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for block in segments(bytes_0to255):
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# there might be a small delay until the character is ready (especially on win32)
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self.failUnlessEqual(self.s.inWaiting(), length, "expected exactly %d character for inWainting()" % length)
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self.failUnlessEqual(self.s.read(length), block)#, "expected a %r which was written before" % block)
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self.failUnlessEqual(self.s.read(1), data(''), "expected empty buffer after all sent chars are read")
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def test2_LoopbackTimeout(self):
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"""timeout: test the timeout/immediate return.
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partial results should be returned."""
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self.s.write(data("HELLO"))
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time.sleep(0.1) # there might be a small delay until the character is ready (especially on win32 and rfc2217)
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# read more characters as are available to run in the timeout
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self.failUnlessEqual(self.s.read(10), data('HELLO'), "expected the 'HELLO' which was written before")
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self.failUnlessEqual(self.s.read(1), data(''), "expected empty buffer after all sent chars are read")
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class Test3_Timeout(Test4_Nonblocking):
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"""Same tests as the NonBlocking ones but this time with timeout"""
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def test0_Messy(self):
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"""Blocking (timeout=1)"""
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# this is only here to write out the message in verbose mode
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# because Test3 and Test4 print the same messages
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class SendEvent(threading.Thread):
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def __init__(self, serial, delay=3):
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threading.Thread.__init__(self)
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self.x = threading.Event()
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time.sleep(self.delay)
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self.serial.write(data("E"))
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return self.x.isSet()
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class Test1_Forever(unittest.TestCase):
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"""Tests a port with no timeout. These tests require that a
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character is sent after some time to stop the test, this is done
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through the SendEvent class and the Loopback HW."""
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self.s = serial.serial_for_url(PORT, timeout=None)
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self.event = SendEvent(self.s)
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def test2_ReadEmpty(self):
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"""no timeout: after port open, the input buffer must be empty (read).
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a character is sent after some time to terminate the test (SendEvent)."""
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if not (self.event.isSet() and c == data('E')):
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self.fail("expected marker")
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class Test2_Forever(unittest.TestCase):
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"""Tests a port with no timeout"""
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self.s = serial.serial_for_url(PORT, timeout=None)
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def test1_inWaitingEmpty(self):
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"""no timeout: after port open, the input buffer must be empty (inWaiting)"""
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self.failUnlessEqual(self.s.inWaiting(), 0, "expected empty buffer")
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def test2_Loopback(self):
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"""no timeout: each sent character should return (binary test).
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this is also a test for the binary capability of a port."""
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for block in segments(bytes_0to255):
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# there might be a small delay until the character is ready (especially on win32 and rfc2217)
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self.failUnlessEqual(self.s.inWaiting(), length)#, "expected exactly %d character for inWainting()" % length)
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self.failUnlessEqual(self.s.read(length), block) #, "expected %r which was written before" % block)
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self.failUnlessEqual(self.s.inWaiting(), 0, "expected empty buffer after all sent chars are read")
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class Test0_DataWires(unittest.TestCase):
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"""Test modem control lines"""
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self.s = serial.serial_for_url(PORT)
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self.failUnless(not self.s.getCTS(), "CTS -> 0")
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self.failUnless(self.s.getCTS(), "CTS -> 1")
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self.failUnless(not self.s.getDSR(), "DSR -> 0")
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self.failUnless(self.s.getDSR(), "DSR -> 1")
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self.failUnless(not self.s.getRI(), "RI -> 0")
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class Test_MoreTimeouts(unittest.TestCase):
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"""Test with timeouts"""
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# create an closed serial port
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self.s = serial.serial_for_url(PORT, do_not_open=True)
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def test_WriteTimeout(self):
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"""Test write() timeout."""
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# use xonxoff setting and the loop-back adapter to switch traffic on hold
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self.s.writeTimeout = 1
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self.s.write(serial.XOFF)
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time.sleep(0.5) # some systems need a little delay so that they can react on XOFF
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self.failUnlessRaises(serial.SerialTimeoutException, self.s.write, data("timeout please"*200))
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self.failUnless( 0.9 <= (t2-t1) < 2.1, "Timeout not in the given interval (%s)" % (t2-t1))
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if __name__ == '__main__':
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sys.stdout.write(__doc__)
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if len(sys.argv) > 1:
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sys.stdout.write("Testing port: %r\n" % PORT)
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sys.argv[1:] = ['-v']
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# When this module is executed from the command-line, it runs all its tests
added
removed
test/test.py
