def test_WriteTimeout(self):
"""Test write() timeout."""
# use xonxoff setting and the loop-back adapter to switch traffic on hold
self.s.port = PORT
self.s.writeTimeout = 1
self.s.xonxoff = 1
self.s.open()
self.s.write(serial.XOFF)
time.sleep(0.5) # some systems need a little delay so that they can react on XOFF
t1 = time.time()
self.failUnlessRaises(serial.SerialTimeoutException, self.s.write, data("timeout please"*200))
t2 = time.time()
self.failUnless( 0.9 <= (t2-t1) < 2.1, "Timeout not in the given interval (%s)" % (t2-t1))
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