test_cli.py 文件源码

def test_cannot_listen(self):
        """
        When the program is run with an argument and a listen address specified
        with a port that we can't listen on (e.g. port 1), a CannotListenError
        is expected to be logged and the program should stop.
        """
        temp_dir = self.useFixture(TempDir())
        yield main(reactor, raw_args=[
            temp_dir.path,
            '--listen', ':1',  # A port we can't listen on
        ])

        # Expect a 'certs' directory to be created
        self.assertThat(os.path.isdir(temp_dir.join('certs')), Equals(True))

        # Expect a default certificate to be created
        self.assertThat(os.path.isfile(temp_dir.join('default.pem')),
                        Equals(True))

        # Expect to be unable to listen
        flush_logged_errors(CannotListenError)