test_smtplib.py 文件源码

def setUp(self):
        self.real_getfqdn = socket.getfqdn
        socket.getfqdn = mock_socket.getfqdn
        # temporarily replace sys.stdout to capture DebuggingServer output
        self.old_stdout = sys.stdout
        self.output = io.StringIO()
        sys.stdout = self.output

        self.serv_evt = threading.Event()
        self.client_evt = threading.Event()
        # Capture SMTPChannel debug output
        self.old_DEBUGSTREAM = smtpd.DEBUGSTREAM
        smtpd.DEBUGSTREAM = io.StringIO()
        # Pick a random unused port by passing 0 for the port number
        self.serv = smtpd.DebuggingServer((HOST, 0), ('nowhere', -1))
        # Keep a note of what port was assigned
        self.port = self.serv.socket.getsockname()[1]
        serv_args = (self.serv, self.serv_evt, self.client_evt)
        self.thread = threading.Thread(target=debugging_server, args=serv_args)
        self.thread.start()

        # wait until server thread has assigned a port number
        self.serv_evt.wait()
        self.serv_evt.clear()