1# Test to see if openpty works. (But don't worry if it isn't available.)
2
3import os, unittest
4
5if not hasattr(os, "openpty"):
6    raise unittest.SkipTest("os.openpty() not available.")
7
8
9class OpenptyTest(unittest.TestCase):
10    def test(self):
11        master, slave = os.openpty()
12        self.addCleanup(os.close, master)
13        self.addCleanup(os.close, slave)
14        if not os.isatty(slave):
15            self.fail("Slave-end of pty is not a terminal.")
16
17        os.write(slave, b'Ping!')
18        self.assertEqual(os.read(master, 1024), b'Ping!')
19
20if __name__ == '__main__':
21    unittest.main()
22