test_devpoll.py 文件源码

def test_close(self):
        open_file = open(__file__, "rb")
        self.addCleanup(open_file.close)
        fd = open_file.fileno()
        devpoll = select.devpoll()

        # test fileno() method and closed attribute
        self.assertIsInstance(devpoll.fileno(), int)
        self.assertFalse(devpoll.closed)

        # test close()
        devpoll.close()
        self.assertTrue(devpoll.closed)
        self.assertRaises(ValueError, devpoll.fileno)

        # close() can be called more than once
        devpoll.close()

        # operations must fail with ValueError("I/O operation on closed ...")
        self.assertRaises(ValueError, devpoll.modify, fd, select.POLLIN)
        self.assertRaises(ValueError, devpoll.poll)
        self.assertRaises(ValueError, devpoll.register, fd, fd, select.POLLIN)
        self.assertRaises(ValueError, devpoll.unregister, fd)