# Test to see if openpty works. (But don't worry if it isn't available.)

import os, unittest

from test.test_support import run_unittest, TestSkipped

if not hasattr(os, "openpty"):

    raise TestSkipped, "No openpty() available."

class OpenptyTest(unittest.TestCase):

    def test(self):

        master, slave = os.openpty()

        if not os.isatty(slave):

            self.fail("Slave-end of pty is not a terminal.")

        os.write(slave, 'Ping!')

        self.assertEqual(os.read(master, 1024), 'Ping!')

def test_main():

    run_unittest(OpenptyTest)

if __name__ == '__main__':

    test_main()