process_test.py 文件源码

def test_subprocess(self):
        if IOLoop.configured_class().__name__.endswith('LayeredTwistedIOLoop'):
            # This test fails non-deterministically with LayeredTwistedIOLoop.
            # (the read_until('\n') returns '\n' instead of 'hello\n')
            # This probably indicates a problem with either TornadoReactor
            # or TwistedIOLoop, but I haven't been able to track it down
            # and for now this is just causing spurious travis-ci failures.
            raise unittest.SkipTest("Subprocess tests not compatible with "
                                    "LayeredTwistedIOLoop")
        subproc = Subprocess([sys.executable, '-u', '-i'],
                             stdin=Subprocess.STREAM,
                             stdout=Subprocess.STREAM, stderr=subprocess.STDOUT,
                             io_loop=self.io_loop)
        self.addCleanup(lambda: os.kill(subproc.pid, signal.SIGTERM))
        subproc.stdout.read_until(b'>>> ', self.stop)
        self.wait()
        subproc.stdin.write(b"print('hello')\n")
        subproc.stdout.read_until(b'\n', self.stop)
        data = self.wait()
        self.assertEqual(data, b"hello\n")

        subproc.stdout.read_until(b">>> ", self.stop)
        self.wait()
        subproc.stdin.write(b"raise SystemExit\n")
        subproc.stdout.read_until_close(self.stop)
        data = self.wait()
        self.assertEqual(data, b"")