test_poll.py 文件源码

def poll_unit_tests(self):
        # returns NVAL for invalid file descriptor
        FD = 42
        try:
            os.close(FD)
        except OSError:
            pass
        p = select.poll()
        p.register(FD)
        r = p.poll()
        self.assertEqual(r[0], (FD, select.POLLNVAL))

        f = open(TESTFN, 'w')
        fd = f.fileno()
        p = select.poll()
        p.register(f)
        r = p.poll()
        self.assertEqual(r[0][0], fd)
        f.close()
        r = p.poll()
        self.assertEqual(r[0], (fd, select.POLLNVAL))
        os.unlink(TESTFN)

        # type error for invalid arguments
        p = select.poll()
        self.assertRaises(TypeError, p.register, p)
        self.assertRaises(TypeError, p.unregister, p)

        # can't unregister non-existent object
        p = select.poll()
        self.assertRaises(KeyError, p.unregister, 3)

        # Test error cases
        pollster = select.poll()
        class Nope:
            pass

        class Almost:
            def fileno(self):
                return 'fileno'

        self.assertRaises(TypeError, pollster.register, Nope(), 0)
        self.assertRaises(TypeError, pollster.register, Almost(), 0)

    # Another test case for poll().  This is copied from the test case for
    # select(), modified to use poll() instead.