Method test_poll

Lib/test/test_subprocess.py:1406–1415

(self)

                         'ab ""')

    def test_poll(self):
        p = subprocess.Popen([sys.executable, "-c",
                              "import os; os.read(0, 1)"],
                             stdin=subprocess.PIPE)
        self.addCleanup(p.stdin.close)
        self.assertIsNone(p.poll())
        os.write(p.stdin.fileno(), b'A')
        p.wait()
        # Subsequent invocations should just return the returncode
        self.assertEqual(p.poll(), 0)

    def test_wait(self):
        p = subprocess.Popen(ZERO_RETURN_CMD)