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Name	Size	Permission	Date
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test_glob.py	18.21 KB	-rw-r--r--	2026-04-20 11:09
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testtar.tar	425 KB	-rw-r--r--	2026-03-03 16:09
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tf_inherit_check.py	714 B	-rw-r--r--	2026-04-20 11:09
time_hashlib.py	2.87 KB	-rw-r--r--	2026-04-20 11:09
win_console_handler.py	1.38 KB	-rw-r--r--	2026-04-20 11:09
xmltests.py	499 B	-rw-r--r--	2026-04-20 11:09
zip_cp437_header.zip	270 B	-rw-r--r--	2026-03-03 16:09
zipdir.zip	374 B	-rw-r--r--	2026-03-03 16:09
zipdir_backslash.zip	192 B	-rw-r--r--	2026-03-03 16:09

Rename

from test import support
from test.support import socket_helper

from contextlib import contextmanager
import imaplib
import os.path
import socketserver
import time
import calendar
import threading
import re
import socket

from test.support import verbose, run_with_tz, run_with_locale, cpython_only, requires_resource
from test.support import hashlib_helper
from test.support import threading_helper
import unittest
from unittest import mock
from datetime import datetime, timezone, timedelta
try:
    import ssl
except ImportError:
    ssl = None

support.requires_working_socket(module=True)

CERTFILE = os.path.join(os.path.dirname(__file__) or os.curdir, "certdata", "keycert3.pem")
CAFILE = os.path.join(os.path.dirname(__file__) or os.curdir, "certdata", "pycacert.pem")

class TestImaplib(unittest.TestCase):

def test_Internaldate2tuple(self):
        t0 = calendar.timegm((2000, 1, 1, 0, 0, 0, -1, -1, -1))
        tt = imaplib.Internaldate2tuple(
            b'25 (INTERNALDATE "01-Jan-2000 00:00:00 +0000")')
        self.assertEqual(time.mktime(tt), t0)
        tt = imaplib.Internaldate2tuple(
            b'25 (INTERNALDATE "01-Jan-2000 11:30:00 +1130")')
        self.assertEqual(time.mktime(tt), t0)
        tt = imaplib.Internaldate2tuple(
            b'25 (INTERNALDATE "31-Dec-1999 12:30:00 -1130")')
        self.assertEqual(time.mktime(tt), t0)

@run_with_tz('MST+07MDT,M4.1.0,M10.5.0')
    def test_Internaldate2tuple_issue10941(self):
        self.assertNotEqual(imaplib.Internaldate2tuple(
            b'25 (INTERNALDATE "02-Apr-2000 02:30:00 +0000")'),
            imaplib.Internaldate2tuple(
                b'25 (INTERNALDATE "02-Apr-2000 03:30:00 +0000")'))

def timevalues(self):
        return [2000000000, 2000000000.0, time.localtime(2000000000),
                (2033, 5, 18, 5, 33, 20, -1, -1, -1),
                (2033, 5, 18, 5, 33, 20, -1, -1, 1),
                datetime.fromtimestamp(2000000000,
                                       timezone(timedelta(0, 2 * 60 * 60))),
                '"18-May-2033 05:33:20 +0200"']

@run_with_locale('LC_ALL', 'de_DE', 'fr_FR', '')
    # DST rules included to work around quirk where the Gnu C library may not
    # otherwise restore the previous time zone
    @run_with_tz('STD-1DST,M3.2.0,M11.1.0')
    def test_Time2Internaldate(self):
        expected = '"18-May-2033 05:33:20 +0200"'

for t in self.timevalues():
            internal = imaplib.Time2Internaldate(t)
            self.assertEqual(internal, expected)

def test_that_Time2Internaldate_returns_a_result(self):
        # Without tzset, we can check only that it successfully
        # produces a result, not the correctness of the result itself,
        # since the result depends on the timezone the machine is in.
        for t in self.timevalues():
            imaplib.Time2Internaldate(t)

@socket_helper.skip_if_tcp_blackhole
    def test_imap4_host_default_value(self):
        # Check whether the IMAP4_PORT is truly unavailable.
        with socket.socket() as s:
            try:
                s.connect(('', imaplib.IMAP4_PORT))
                self.skipTest(
                    "Cannot run the test with local IMAP server running.")
            except socket.error:
                pass

# This is the exception that should be raised.
        expected_errnos = socket_helper.get_socket_conn_refused_errs()
        with self.assertRaises(OSError) as cm:
            imaplib.IMAP4()
        self.assertIn(cm.exception.errno, expected_errnos)

if ssl:
    class SecureTCPServer(socketserver.TCPServer):

def get_request(self):
            newsocket, fromaddr = self.socket.accept()
            context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
            context.load_cert_chain(CERTFILE)
            connstream = context.wrap_socket(newsocket, server_side=True)
            return connstream, fromaddr

IMAP4_SSL = imaplib.IMAP4_SSL

else:

class SecureTCPServer:
        pass

IMAP4_SSL = None

class SimpleIMAPHandler(socketserver.StreamRequestHandler):
    timeout = support.LOOPBACK_TIMEOUT
    continuation = None
    capabilities = ''

def setup(self):
        super().setup()
        self.server.is_selected = False
        self.server.logged = None

def _send(self, message):
        if verbose:
            print("SENT: %r" % message.strip())
        self.wfile.write(message)

def _send_line(self, message):
        self._send(message + b'\r\n')

def _send_textline(self, message):
        self._send_line(message.encode('ASCII'))

def _send_tagged(self, tag, code, message):
        self._send_textline(' '.join((tag, code, message)))

def handle(self):
        # Send a welcome message.
        self._send_textline('* OK IMAP4rev1')
        while 1:
            # Gather up input until we receive a line terminator or we timeout.
            # Accumulate read(1) because it's simpler to handle the differences
            # between naked sockets and SSL sockets.
            line = b''
            while 1:
                try:
                    part = self.rfile.read(1)
                    if part == b'':
                        # Naked sockets return empty strings..
                        return
                    line += part
                except OSError:
                    # ..but SSLSockets raise exceptions.
                    return
                if line.endswith(b'\r\n'):
                    break

if verbose:
                print('GOT: %r' % line.strip())
            if self.continuation:
                try:
                    self.continuation.send(line)
                except StopIteration:
                    self.continuation = None
                continue
            splitline = line.decode('ASCII').split()
            tag = splitline[0]
            cmd = splitline[1]
            args = splitline[2:]

if hasattr(self, 'cmd_' + cmd):
                continuation = getattr(self, 'cmd_' + cmd)(tag, args)
                if continuation:
                    self.continuation = continuation
                    next(continuation)
            else:
                self._send_tagged(tag, 'BAD', cmd + ' unknown')

def cmd_CAPABILITY(self, tag, args):
        caps = ('IMAP4rev1 ' + self.capabilities
                if self.capabilities
                else 'IMAP4rev1')
        self._send_textline('* CAPABILITY ' + caps)
        self._send_tagged(tag, 'OK', 'CAPABILITY completed')

def cmd_LOGOUT(self, tag, args):
        self.server.logged = None
        self._send_textline('* BYE IMAP4ref1 Server logging out')
        self._send_tagged(tag, 'OK', 'LOGOUT completed')

def cmd_LOGIN(self, tag, args):
        self.server.logged = args[0]
        self._send_tagged(tag, 'OK', 'LOGIN completed')

def cmd_SELECT(self, tag, args):
        self.server.is_selected = True
        self._send_line(b'* 2 EXISTS')
        self._send_tagged(tag, 'OK', '[READ-WRITE] SELECT completed.')

def cmd_UNSELECT(self, tag, args):
        if self.server.is_selected:
            self.server.is_selected = False
            self._send_tagged(tag, 'OK', 'Returned to authenticated state. (Success)')
        else:
            self._send_tagged(tag, 'BAD', 'No mailbox selected')

class NewIMAPTestsMixin():
    client = None

def _setup(self, imap_handler, connect=True):
        """
        Sets up imap_handler for tests. imap_handler should inherit from either:
        - SimpleIMAPHandler - for testing IMAP commands,
        - socketserver.StreamRequestHandler - if raw access to stream is needed.
        Returns (client, server).
        """
        class TestTCPServer(self.server_class):
            def handle_error(self, request, client_address):
                """
                End request and raise the error if one occurs.
                """
                self.close_request(request)
                self.server_close()
                raise

self.addCleanup(self._cleanup)
        self.server = self.server_class((socket_helper.HOST, 0), imap_handler)
        self.thread = threading.Thread(
            name=self._testMethodName+'-server',
            target=self.server.serve_forever,
            # Short poll interval to make the test finish quickly.
            # Time between requests is short enough that we won't wake
            # up spuriously too many times.
            kwargs={'poll_interval': 0.01})
        self.thread.daemon = True  # In case this function raises.
        self.thread.start()

if connect:
            self.client = self.imap_class(*self.server.server_address)

return self.client, self.server

def _cleanup(self):
        """
        Cleans up the test server. This method should not be called manually,
        it is added to the cleanup queue in the _setup method already.
        """
        # if logout was called already we'd raise an exception trying to
        # shutdown the client once again
        if self.client is not None and self.client.state != 'LOGOUT':
            self.client.shutdown()
        # cleanup the server
        self.server.shutdown()
        self.server.server_close()
        threading_helper.join_thread(self.thread)
        # Explicitly clear the attribute to prevent dangling thread
        self.thread = None

def test_EOF_without_complete_welcome_message(self):
        # http://bugs.python.org/issue5949
        class EOFHandler(socketserver.StreamRequestHandler):
            def handle(self):
                self.wfile.write(b'* OK')
        _, server = self._setup(EOFHandler, connect=False)
        self.assertRaises(imaplib.IMAP4.abort, self.imap_class,
                          *server.server_address)

def test_line_termination(self):
        class BadNewlineHandler(SimpleIMAPHandler):
            def cmd_CAPABILITY(self, tag, args):
                self._send(b'* CAPABILITY IMAP4rev1 AUTH\n')
                self._send_tagged(tag, 'OK', 'CAPABILITY completed')
        _, server = self._setup(BadNewlineHandler, connect=False)
        self.assertRaises(imaplib.IMAP4.abort, self.imap_class,
                          *server.server_address)

def test_enable_raises_error_if_not_AUTH(self):
        class EnableHandler(SimpleIMAPHandler):
            capabilities = 'AUTH ENABLE UTF8=ACCEPT'
        client, _ = self._setup(EnableHandler)
        self.assertFalse(client.utf8_enabled)
        with self.assertRaisesRegex(imaplib.IMAP4.error, 'ENABLE.*NONAUTH'):
            client.enable('foo')
        self.assertFalse(client.utf8_enabled)

def test_enable_raises_error_if_no_capability(self):
        client, _ = self._setup(SimpleIMAPHandler)
        with self.assertRaisesRegex(imaplib.IMAP4.error,
                'does not support ENABLE'):
            client.enable('foo')

def test_enable_UTF8_raises_error_if_not_supported(self):
        client, _ = self._setup(SimpleIMAPHandler)
        typ, data = client.login('user', 'pass')
        self.assertEqual(typ, 'OK')
        with self.assertRaisesRegex(imaplib.IMAP4.error,
                'does not support ENABLE'):
            client.enable('UTF8=ACCEPT')

def test_enable_UTF8_True_append(self):
        class UTF8AppendServer(SimpleIMAPHandler):
            capabilities = 'ENABLE UTF8=ACCEPT'
            def cmd_ENABLE(self, tag, args):
                self._send_tagged(tag, 'OK', 'ENABLE successful')
            def cmd_AUTHENTICATE(self, tag, args):
                self._send_textline('+')
                self.server.response = yield
                self._send_tagged(tag, 'OK', 'FAKEAUTH successful')
            def cmd_APPEND(self, tag, args):
                self._send_textline('+')
                self.server.response = yield
                self._send_tagged(tag, 'OK', 'okay')
        client, server = self._setup(UTF8AppendServer)
        self.assertEqual(client._encoding, 'ascii')
        code, _ = client.authenticate('MYAUTH', lambda x: b'fake')
        self.assertEqual(code, 'OK')
        self.assertEqual(server.response, b'ZmFrZQ==\r\n')  # b64 encoded 'fake'
        code, _ = client.enable('UTF8=ACCEPT')
        self.assertEqual(code, 'OK')
        self.assertEqual(client._encoding, 'utf-8')
        msg_string = 'Subject: üñí©öðé'
        typ, data = client.append(None, None, None, msg_string.encode('utf-8'))
        self.assertEqual(typ, 'OK')
        self.assertEqual(server.response,
            ('UTF8 (%s)\r\n' % msg_string).encode('utf-8'))

def test_search_disallows_charset_in_utf8_mode(self):
        class UTF8Server(SimpleIMAPHandler):
            capabilities = 'AUTH ENABLE UTF8=ACCEPT'
            def cmd_ENABLE(self, tag, args):
                self._send_tagged(tag, 'OK', 'ENABLE successful')
            def cmd_AUTHENTICATE(self, tag, args):
                self._send_textline('+')
                self.server.response = yield
                self._send_tagged(tag, 'OK', 'FAKEAUTH successful')
        client, _ = self._setup(UTF8Server)
        typ, _ = client.authenticate('MYAUTH', lambda x: b'fake')
        self.assertEqual(typ, 'OK')
        typ, _ = client.enable('UTF8=ACCEPT')
        self.assertEqual(typ, 'OK')
        self.assertTrue(client.utf8_enabled)
        with self.assertRaisesRegex(imaplib.IMAP4.error, 'charset.*UTF8'):
            client.search('foo', 'bar')

def test_bad_auth_name(self):
        class MyServer(SimpleIMAPHandler):
            def cmd_AUTHENTICATE(self, tag, args):
                self._send_tagged(tag, 'NO',
                    'unrecognized authentication type {}'.format(args[0]))
        client, _ = self._setup(MyServer)
        with self.assertRaisesRegex(imaplib.IMAP4.error,
                'unrecognized authentication type METHOD'):
            client.authenticate('METHOD', lambda: 1)

def test_invalid_authentication(self):
        class MyServer(SimpleIMAPHandler):
            def cmd_AUTHENTICATE(self, tag, args):
                self._send_textline('+')
                self.response = yield
                self._send_tagged(tag, 'NO', '[AUTHENTICATIONFAILED] invalid')
        client, _ = self._setup(MyServer)
        with self.assertRaisesRegex(imaplib.IMAP4.error,
                r'\[AUTHENTICATIONFAILED\] invalid'):
            client.authenticate('MYAUTH', lambda x: b'fake')

def test_valid_authentication_bytes(self):
        class MyServer(SimpleIMAPHandler):
            def cmd_AUTHENTICATE(self, tag, args):
                self._send_textline('+')
                self.server.response = yield
                self._send_tagged(tag, 'OK', 'FAKEAUTH successful')
        client, server = self._setup(MyServer)
        code, _ = client.authenticate('MYAUTH', lambda x: b'fake')
        self.assertEqual(code, 'OK')
        self.assertEqual(server.response, b'ZmFrZQ==\r\n')  # b64 encoded 'fake'

def test_valid_authentication_plain_text(self):
        class MyServer(SimpleIMAPHandler):
            def cmd_AUTHENTICATE(self, tag, args):
                self._send_textline('+')
                self.server.response = yield
                self._send_tagged(tag, 'OK', 'FAKEAUTH successful')
        client, server = self._setup(MyServer)
        code, _ = client.authenticate('MYAUTH', lambda x: 'fake')
        self.assertEqual(code, 'OK')
        self.assertEqual(server.response, b'ZmFrZQ==\r\n')  # b64 encoded 'fake'

@hashlib_helper.requires_hashdigest('md5', openssl=True)
    def test_login_cram_md5_bytes(self):
        class AuthHandler(SimpleIMAPHandler):
            capabilities = 'LOGINDISABLED AUTH=CRAM-MD5'
            def cmd_AUTHENTICATE(self, tag, args):
                self._send_textline('+ PDE4OTYuNjk3MTcwOTUyQHBvc3RvZmZpY2Uucm'
                                    'VzdG9uLm1jaS5uZXQ=')
                r = yield
                if (r == b'dGltIGYxY2E2YmU0NjRiOWVmYT'
                         b'FjY2E2ZmZkNmNmMmQ5ZjMy\r\n'):
                    self._send_tagged(tag, 'OK', 'CRAM-MD5 successful')
                else:
                    self._send_tagged(tag, 'NO', 'No access')
        client, _ = self._setup(AuthHandler)
        self.assertTrue('AUTH=CRAM-MD5' in client.capabilities)
        ret, _ = client.login_cram_md5("tim", b"tanstaaftanstaaf")
        self.assertEqual(ret, "OK")

@hashlib_helper.requires_hashdigest('md5', openssl=True)
    def test_login_cram_md5_plain_text(self):
        class AuthHandler(SimpleIMAPHandler):
            capabilities = 'LOGINDISABLED AUTH=CRAM-MD5'
            def cmd_AUTHENTICATE(self, tag, args):
                self._send_textline('+ PDE4OTYuNjk3MTcwOTUyQHBvc3RvZmZpY2Uucm'
                                    'VzdG9uLm1jaS5uZXQ=')
                r = yield
                if (r == b'dGltIGYxY2E2YmU0NjRiOWVmYT'
                         b'FjY2E2ZmZkNmNmMmQ5ZjMy\r\n'):
                    self._send_tagged(tag, 'OK', 'CRAM-MD5 successful')
                else:
                    self._send_tagged(tag, 'NO', 'No access')
        client, _ = self._setup(AuthHandler)
        self.assertTrue('AUTH=CRAM-MD5' in client.capabilities)
        ret, _ = client.login_cram_md5("tim", "tanstaaftanstaaf")
        self.assertEqual(ret, "OK")

def test_aborted_authentication(self):
        class MyServer(SimpleIMAPHandler):
            def cmd_AUTHENTICATE(self, tag, args):
                self._send_textline('+')
                self.response = yield
                if self.response == b'*\r\n':
                    self._send_tagged(
                        tag,
                        'NO',
                        '[AUTHENTICATIONFAILED] aborted')
                else:
                    self._send_tagged(tag, 'OK', 'MYAUTH successful')
        client, _ = self._setup(MyServer)
        with self.assertRaisesRegex(imaplib.IMAP4.error,
                r'\[AUTHENTICATIONFAILED\] aborted'):
            client.authenticate('MYAUTH', lambda x: None)

@mock.patch('imaplib._MAXLINE', 10)
    def test_linetoolong(self):
        class TooLongHandler(SimpleIMAPHandler):
            def handle(self):
                # send response line longer than the limit set in the next line
                self.wfile.write(b'* OK ' + 11 * b'x' + b'\r\n')
        _, server = self._setup(TooLongHandler, connect=False)
        with self.assertRaisesRegex(imaplib.IMAP4.error,
                'got more than 10 bytes'):
            self.imap_class(*server.server_address)

def test_simple_with_statement(self):
        _, server = self._setup(SimpleIMAPHandler, connect=False)
        with self.imap_class(*server.server_address):
            pass

def test_imaplib_timeout_test(self):
        _, server = self._setup(SimpleIMAPHandler, connect=False)
        with self.imap_class(*server.server_address, timeout=None) as client:
            self.assertEqual(client.sock.timeout, None)
        with self.imap_class(*server.server_address, timeout=support.LOOPBACK_TIMEOUT) as client:
            self.assertEqual(client.sock.timeout, support.LOOPBACK_TIMEOUT)
        with self.assertRaises(ValueError):
            self.imap_class(*server.server_address, timeout=0)

def test_imaplib_timeout_functionality_test(self):
        class TimeoutHandler(SimpleIMAPHandler):
            def handle(self):
                time.sleep(1)
                SimpleIMAPHandler.handle(self)

_, server = self._setup(TimeoutHandler)
        addr = server.server_address[1]
        with self.assertRaises(TimeoutError):
            client = self.imap_class("localhost", addr, timeout=0.001)

def test_with_statement(self):
        _, server = self._setup(SimpleIMAPHandler, connect=False)
        with self.imap_class(*server.server_address) as imap:
            imap.login('user', 'pass')
            self.assertEqual(server.logged, 'user')
        self.assertIsNone(server.logged)

def test_with_statement_logout(self):
        # It is legal to log out explicitly inside the with block
        _, server = self._setup(SimpleIMAPHandler, connect=False)
        with self.imap_class(*server.server_address) as imap:
            imap.login('user', 'pass')
            self.assertEqual(server.logged, 'user')
            imap.logout()
            self.assertIsNone(server.logged)
        self.assertIsNone(server.logged)

# command tests

def test_login(self):
        client, _ = self._setup(SimpleIMAPHandler)
        typ, data = client.login('user', 'pass')
        self.assertEqual(typ, 'OK')
        self.assertEqual(data[0], b'LOGIN completed')
        self.assertEqual(client.state, 'AUTH')

def test_logout(self):
        client, _ = self._setup(SimpleIMAPHandler)
        typ, data = client.login('user', 'pass')
        self.assertEqual(typ, 'OK')
        self.assertEqual(data[0], b'LOGIN completed')
        typ, data = client.logout()
        self.assertEqual(typ, 'BYE', (typ, data))
        self.assertEqual(data[0], b'IMAP4ref1 Server logging out', (typ, data))
        self.assertEqual(client.state, 'LOGOUT')

def test_lsub(self):
        class LsubCmd(SimpleIMAPHandler):
            def cmd_LSUB(self, tag, args):
                self._send_textline('* LSUB () "." directoryA')
                return self._send_tagged(tag, 'OK', 'LSUB completed')
        client, _ = self._setup(LsubCmd)
        client.login('user', 'pass')
        typ, data = client.lsub()
        self.assertEqual(typ, 'OK')
        self.assertEqual(data[0], b'() "." directoryA')

def test_unselect(self):
        client, _ = self._setup(SimpleIMAPHandler)
        client.login('user', 'pass')
        typ, data = client.select()
        self.assertEqual(typ, 'OK')
        self.assertEqual(data[0], b'2')

typ, data = client.unselect()
        self.assertEqual(typ, 'OK')
        self.assertEqual(data[0], b'Returned to authenticated state. (Success)')
        self.assertEqual(client.state, 'AUTH')

class NewIMAPTests(NewIMAPTestsMixin, unittest.TestCase):
    imap_class = imaplib.IMAP4
    server_class = socketserver.TCPServer

@unittest.skipUnless(ssl, "SSL not available")
class NewIMAPSSLTests(NewIMAPTestsMixin, unittest.TestCase):
    imap_class = IMAP4_SSL
    server_class = SecureTCPServer

def test_ssl_raises(self):
        ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
        self.assertEqual(ssl_context.verify_mode, ssl.CERT_REQUIRED)
        self.assertEqual(ssl_context.check_hostname, True)
        ssl_context.load_verify_locations(CAFILE)

# Allow for flexible libssl error messages.
        regex = re.compile(r"""(
            IP address mismatch, certificate is not valid for '127.0.0.1'   # OpenSSL
            |
            CERTIFICATE_VERIFY_FAILED                                       # AWS-LC
        )""", re.X)
        with self.assertRaisesRegex(ssl.CertificateError, regex):
            _, server = self._setup(SimpleIMAPHandler, connect=False)
            client = self.imap_class(*server.server_address,
                                     ssl_context=ssl_context)
            client.shutdown()

def test_ssl_verified(self):
        ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
        ssl_context.load_verify_locations(CAFILE)

_, server = self._setup(SimpleIMAPHandler, connect=False)
        client = self.imap_class("localhost", server.server_address[1],
                                 ssl_context=ssl_context)
        client.shutdown()

class ThreadedNetworkedTests(unittest.TestCase):
    server_class = socketserver.TCPServer
    imap_class = imaplib.IMAP4

def make_server(self, addr, hdlr):

class MyServer(self.server_class):
            def handle_error(self, request, client_address):
                self.close_request(request)
                self.server_close()
                raise

if verbose:
            print("creating server")
        server = MyServer(addr, hdlr)
        self.assertEqual(server.server_address, server.socket.getsockname())

if verbose:
            print("server created")
            print("ADDR =", addr)
            print("CLASS =", self.server_class)
            print("HDLR =", server.RequestHandlerClass)

t = threading.Thread(
            name='%s serving' % self.server_class,
            target=server.serve_forever,
            # Short poll interval to make the test finish quickly.
            # Time between requests is short enough that we won't wake
            # up spuriously too many times.
            kwargs={'poll_interval': 0.01})
        t.daemon = True  # In case this function raises.
        t.start()
        if verbose:
            print("server running")
        return server, t

def reap_server(self, server, thread):
        if verbose:
            print("waiting for server")
        server.shutdown()
        server.server_close()
        thread.join()
        if verbose:
            print("done")

@contextmanager
    def reaped_server(self, hdlr):
        server, thread = self.make_server((socket_helper.HOST, 0), hdlr)
        try:
            yield server
        finally:
            self.reap_server(server, thread)

@contextmanager
    def reaped_pair(self, hdlr):
        with self.reaped_server(hdlr) as server:
            client = self.imap_class(*server.server_address)
            try:
                yield server, client
            finally:
                client.logout()

@threading_helper.reap_threads
    def test_connect(self):
        with self.reaped_server(SimpleIMAPHandler) as server:
            client = self.imap_class(*server.server_address)
            client.shutdown()

@threading_helper.reap_threads
    def test_bracket_flags(self):

# This violates RFC 3501, which disallows ']' characters in tag names,
        # but imaplib has allowed producing such tags forever, other programs
        # also produce them (eg: OtherInbox's Organizer app as of 20140716),
        # and Gmail, for example, accepts them and produces them.  So we
        # support them.  See issue #21815.

class BracketFlagHandler(SimpleIMAPHandler):

def handle(self):
                self.flags = ['Answered', 'Flagged', 'Deleted', 'Seen', 'Draft']
                super().handle()

def cmd_AUTHENTICATE(self, tag, args):
                self._send_textline('+')
                self.server.response = yield
                self._send_tagged(tag, 'OK', 'FAKEAUTH successful')

def cmd_SELECT(self, tag, args):
                flag_msg = ' \\'.join(self.flags)
                self._send_line(('* FLAGS (%s)' % flag_msg).encode('ascii'))
                self._send_line(b'* 2 EXISTS')
                self._send_line(b'* 0 RECENT')
                msg = ('* OK [PERMANENTFLAGS %s \\*)] Flags permitted.'
                        % flag_msg)
                self._send_line(msg.encode('ascii'))
                self._send_tagged(tag, 'OK', '[READ-WRITE] SELECT completed.')

def cmd_STORE(self, tag, args):
                new_flags = args[2].strip('(').strip(')').split()
                self.flags.extend(new_flags)
                flags_msg = '(FLAGS (%s))' % ' \\'.join(self.flags)
                msg = '* %s FETCH %s' % (args[0], flags_msg)
                self._send_line(msg.encode('ascii'))
                self._send_tagged(tag, 'OK', 'STORE completed.')

with self.reaped_pair(BracketFlagHandler) as (server, client):
            code, data = client.authenticate('MYAUTH', lambda x: b'fake')
            self.assertEqual(code, 'OK')
            self.assertEqual(server.response, b'ZmFrZQ==\r\n')
            client.select('test')
            typ, [data] = client.store(b'1', "+FLAGS", "[test]")
            self.assertIn(b'[test]', data)
            client.select('test')
            typ, [data] = client.response('PERMANENTFLAGS')
            self.assertIn(b'[test]', data)

@threading_helper.reap_threads
    def test_issue5949(self):

class EOFHandler(socketserver.StreamRequestHandler):
            def handle(self):
                # EOF without sending a complete welcome message.
                self.wfile.write(b'* OK')

with self.reaped_server(EOFHandler) as server:
            self.assertRaises(imaplib.IMAP4.abort,
                              self.imap_class, *server.server_address)

@threading_helper.reap_threads
    def test_line_termination(self):

class BadNewlineHandler(SimpleIMAPHandler):

def cmd_CAPABILITY(self, tag, args):
                self._send(b'* CAPABILITY IMAP4rev1 AUTH\n')
                self._send_tagged(tag, 'OK', 'CAPABILITY completed')

with self.reaped_server(BadNewlineHandler) as server:
            self.assertRaises(imaplib.IMAP4.abort,
                              self.imap_class, *server.server_address)

class UTF8Server(SimpleIMAPHandler):
        capabilities = 'AUTH ENABLE UTF8=ACCEPT'

def cmd_ENABLE(self, tag, args):
            self._send_tagged(tag, 'OK', 'ENABLE successful')

def cmd_AUTHENTICATE(self, tag, args):
            self._send_textline('+')
            self.server.response = yield
            self._send_tagged(tag, 'OK', 'FAKEAUTH successful')

@threading_helper.reap_threads
    def test_enable_raises_error_if_not_AUTH(self):
        with self.reaped_pair(self.UTF8Server) as (server, client):
            self.assertFalse(client.utf8_enabled)
            self.assertRaises(imaplib.IMAP4.error, client.enable, 'foo')
            self.assertFalse(client.utf8_enabled)

# XXX Also need a test that enable after SELECT raises an error.

@threading_helper.reap_threads
    def test_enable_raises_error_if_no_capability(self):
        class NoEnableServer(self.UTF8Server):
            capabilities = 'AUTH'
        with self.reaped_pair(NoEnableServer) as (server, client):
            self.assertRaises(imaplib.IMAP4.error, client.enable, 'foo')

@threading_helper.reap_threads
    def test_enable_UTF8_raises_error_if_not_supported(self):
        class NonUTF8Server(SimpleIMAPHandler):
            pass
        with self.assertRaises(imaplib.IMAP4.error):
            with self.reaped_pair(NonUTF8Server) as (server, client):
                typ, data = client.login('user', 'pass')
                self.assertEqual(typ, 'OK')
                client.enable('UTF8=ACCEPT')

@threading_helper.reap_threads
    def test_enable_UTF8_True_append(self):

class UTF8AppendServer(self.UTF8Server):
            def cmd_APPEND(self, tag, args):
                self._send_textline('+')
                self.server.response = yield
                self._send_tagged(tag, 'OK', 'okay')

with self.reaped_pair(UTF8AppendServer) as (server, client):
            self.assertEqual(client._encoding, 'ascii')
            code, _ = client.authenticate('MYAUTH', lambda x: b'fake')
            self.assertEqual(code, 'OK')
            self.assertEqual(server.response,
                             b'ZmFrZQ==\r\n')  # b64 encoded 'fake'
            code, _ = client.enable('UTF8=ACCEPT')
            self.assertEqual(code, 'OK')
            self.assertEqual(client._encoding, 'utf-8')
            msg_string = 'Subject: üñí©öðé'
            typ, data = client.append(
                None, None, None, msg_string.encode('utf-8'))
            self.assertEqual(typ, 'OK')
            self.assertEqual(
                server.response,
                ('UTF8 (%s)\r\n' % msg_string).encode('utf-8')
            )

# XXX also need a test that makes sure that the Literal and Untagged_status
    # regexes uses unicode in UTF8 mode instead of the default ASCII.

@threading_helper.reap_threads
    def test_search_disallows_charset_in_utf8_mode(self):
        with self.reaped_pair(self.UTF8Server) as (server, client):
            typ, _ = client.authenticate('MYAUTH', lambda x: b'fake')
            self.assertEqual(typ, 'OK')
            typ, _ = client.enable('UTF8=ACCEPT')
            self.assertEqual(typ, 'OK')
            self.assertTrue(client.utf8_enabled)
            self.assertRaises(imaplib.IMAP4.error, client.search, 'foo', 'bar')

@threading_helper.reap_threads
    def test_bad_auth_name(self):

class MyServer(SimpleIMAPHandler):

def cmd_AUTHENTICATE(self, tag, args):
                self._send_tagged(tag, 'NO', 'unrecognized authentication '
                                  'type {}'.format(args[0]))

with self.reaped_pair(MyServer) as (server, client):
            with self.assertRaises(imaplib.IMAP4.error):
                client.authenticate('METHOD', lambda: 1)

@threading_helper.reap_threads
    def test_invalid_authentication(self):

class MyServer(SimpleIMAPHandler):

def cmd_AUTHENTICATE(self, tag, args):
                self._send_textline('+')
                self.response = yield
                self._send_tagged(tag, 'NO', '[AUTHENTICATIONFAILED] invalid')

with self.reaped_pair(MyServer) as (server, client):
            with self.assertRaises(imaplib.IMAP4.error):
                code, data = client.authenticate('MYAUTH', lambda x: b'fake')

@threading_helper.reap_threads
    def test_valid_authentication(self):

class MyServer(SimpleIMAPHandler):

def cmd_AUTHENTICATE(self, tag, args):
                self._send_textline('+')
                self.server.response = yield
                self._send_tagged(tag, 'OK', 'FAKEAUTH successful')

with self.reaped_pair(MyServer) as (server, client):
            code, data = client.authenticate('MYAUTH', lambda x: b'fake')
            self.assertEqual(code, 'OK')
            self.assertEqual(server.response,
                             b'ZmFrZQ==\r\n')  # b64 encoded 'fake'

with self.reaped_pair(MyServer) as (server, client):
            code, data = client.authenticate('MYAUTH', lambda x: 'fake')
            self.assertEqual(code, 'OK')
            self.assertEqual(server.response,
                             b'ZmFrZQ==\r\n')  # b64 encoded 'fake'

@threading_helper.reap_threads
    @hashlib_helper.requires_hashdigest('md5', openssl=True)
    def test_login_cram_md5(self):

class AuthHandler(SimpleIMAPHandler):

capabilities = 'LOGINDISABLED AUTH=CRAM-MD5'

def cmd_AUTHENTICATE(self, tag, args):
                self._send_textline('+ PDE4OTYuNjk3MTcwOTUyQHBvc3RvZmZpY2Uucm'
                                    'VzdG9uLm1jaS5uZXQ=')
                r = yield
                if (r == b'dGltIGYxY2E2YmU0NjRiOWVmYT'
                         b'FjY2E2ZmZkNmNmMmQ5ZjMy\r\n'):
                    self._send_tagged(tag, 'OK', 'CRAM-MD5 successful')
                else:
                    self._send_tagged(tag, 'NO', 'No access')

with self.reaped_pair(AuthHandler) as (server, client):
            self.assertTrue('AUTH=CRAM-MD5' in client.capabilities)
            ret, data = client.login_cram_md5("tim", "tanstaaftanstaaf")
            self.assertEqual(ret, "OK")

with self.reaped_pair(AuthHandler) as (server, client):
            self.assertTrue('AUTH=CRAM-MD5' in client.capabilities)
            ret, data = client.login_cram_md5("tim", b"tanstaaftanstaaf")
            self.assertEqual(ret, "OK")

@threading_helper.reap_threads
    def test_aborted_authentication(self):

class MyServer(SimpleIMAPHandler):

def cmd_AUTHENTICATE(self, tag, args):
                self._send_textline('+')
                self.response = yield

if self.response == b'*\r\n':
                    self._send_tagged(tag, 'NO', '[AUTHENTICATIONFAILED] aborted')
                else:
                    self._send_tagged(tag, 'OK', 'MYAUTH successful')

with self.reaped_pair(MyServer) as (server, client):
            with self.assertRaises(imaplib.IMAP4.error):
                code, data = client.authenticate('MYAUTH', lambda x: None)

def test_linetoolong(self):
        class TooLongHandler(SimpleIMAPHandler):
            def handle(self):
                # Send a very long response line
                self.wfile.write(b'* OK ' + imaplib._MAXLINE * b'x' + b'\r\n')

with self.reaped_server(TooLongHandler) as server:
            self.assertRaises(imaplib.IMAP4.error,
                              self.imap_class, *server.server_address)

def test_truncated_large_literal(self):
        size = 0
        class BadHandler(SimpleIMAPHandler):
            def handle(self):
                self._send_textline('* OK {%d}' % size)
                self._send_textline('IMAP4rev1')

for exponent in range(15, 64):
            size = 1 << exponent
            with self.subTest(f"size=2e{size}"):
                with self.reaped_server(BadHandler) as server:
                    with self.assertRaises(imaplib.IMAP4.abort):
                        self.imap_class(*server.server_address)

@threading_helper.reap_threads
    def test_simple_with_statement(self):
        # simplest call
        with self.reaped_server(SimpleIMAPHandler) as server:
            with self.imap_class(*server.server_address):
                pass

@threading_helper.reap_threads
    def test_with_statement(self):
        with self.reaped_server(SimpleIMAPHandler) as server:
            with self.imap_class(*server.server_address) as imap:
                imap.login('user', 'pass')
                self.assertEqual(server.logged, 'user')
            self.assertIsNone(server.logged)

@threading_helper.reap_threads
    def test_with_statement_logout(self):
        # what happens if already logout in the block?
        with self.reaped_server(SimpleIMAPHandler) as server:
            with self.imap_class(*server.server_address) as imap:
                imap.login('user', 'pass')
                self.assertEqual(server.logged, 'user')
                imap.logout()
                self.assertIsNone(server.logged)
            self.assertIsNone(server.logged)

@threading_helper.reap_threads
    @cpython_only
    @unittest.skipUnless(__debug__, "Won't work if __debug__ is False")
    def test_dump_ur(self):
        # See: http://bugs.python.org/issue26543
        untagged_resp_dict = {'READ-WRITE': [b'']}

with self.reaped_server(SimpleIMAPHandler) as server:
            with self.imap_class(*server.server_address) as imap:
                with mock.patch.object(imap, '_mesg') as mock_mesg:
                    imap._dump_ur(untagged_resp_dict)
                    mock_mesg.assert_called_with(
                        "untagged responses dump:READ-WRITE: [b'']"
                    )

@unittest.skipUnless(ssl, "SSL not available")
class ThreadedNetworkedTestsSSL(ThreadedNetworkedTests):
    server_class = SecureTCPServer
    imap_class = IMAP4_SSL

@threading_helper.reap_threads
    def test_ssl_verified(self):
        ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
        ssl_context.load_verify_locations(CAFILE)

# Allow for flexible libssl error messages.
        regex = re.compile(r"""(
            IP address mismatch, certificate is not valid for '127.0.0.1'   # OpenSSL
            |
            CERTIFICATE_VERIFY_FAILED                                       # AWS-LC
        )""", re.X)
        with self.assertRaisesRegex(ssl.CertificateError, regex):
            with self.reaped_server(SimpleIMAPHandler) as server:
                client = self.imap_class(*server.server_address,
                                         ssl_context=ssl_context)
                client.shutdown()

with self.reaped_server(SimpleIMAPHandler) as server:
            client = self.imap_class("localhost", server.server_address[1],
                                     ssl_context=ssl_context)
            client.shutdown()

@unittest.skipUnless(
    support.is_resource_enabled('network'), 'network resource disabled')
@unittest.skip('cyrus.andrew.cmu.edu blocks connections')
class RemoteIMAPTest(unittest.TestCase):
    host = 'cyrus.andrew.cmu.edu'
    port = 143
    username = 'anonymous'
    password = 'pass'
    imap_class = imaplib.IMAP4

def setUp(self):
        with socket_helper.transient_internet(self.host):
            self.server = self.imap_class(self.host, self.port)

def tearDown(self):
        if self.server is not None:
            with socket_helper.transient_internet(self.host):
                self.server.logout()

def test_logincapa(self):
        with socket_helper.transient_internet(self.host):
            for cap in self.server.capabilities:
                self.assertIsInstance(cap, str)
            self.assertIn('LOGINDISABLED', self.server.capabilities)
            self.assertIn('AUTH=ANONYMOUS', self.server.capabilities)
            rs = self.server.login(self.username, self.password)
            self.assertEqual(rs[0], 'OK')

def test_logout(self):
        with socket_helper.transient_internet(self.host):
            rs = self.server.logout()
            self.server = None
            self.assertEqual(rs[0], 'BYE', rs)

@unittest.skipUnless(ssl, "SSL not available")
@unittest.skipUnless(
    support.is_resource_enabled('network'), 'network resource disabled')
@unittest.skip('cyrus.andrew.cmu.edu blocks connections')
class RemoteIMAP_STARTTLSTest(RemoteIMAPTest):

def setUp(self):
        super().setUp()
        with socket_helper.transient_internet(self.host):
            rs = self.server.starttls()
            self.assertEqual(rs[0], 'OK')

def test_logincapa(self):
        for cap in self.server.capabilities:
            self.assertIsInstance(cap, str)
        self.assertNotIn('LOGINDISABLED', self.server.capabilities)

@unittest.skipUnless(ssl, "SSL not available")
@unittest.skip('cyrus.andrew.cmu.edu blocks connections')
class RemoteIMAP_SSLTest(RemoteIMAPTest):
    port = 993
    imap_class = IMAP4_SSL

def setUp(self):
        pass

def tearDown(self):
        pass

def create_ssl_context(self):
        ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
        ssl_context.check_hostname = False
        ssl_context.verify_mode = ssl.CERT_NONE
        ssl_context.load_cert_chain(CERTFILE)
        return ssl_context

def check_logincapa(self, server):
        try:
            for cap in server.capabilities:
                self.assertIsInstance(cap, str)
            self.assertNotIn('LOGINDISABLED', server.capabilities)
            self.assertIn('AUTH=PLAIN', server.capabilities)
            rs = server.login(self.username, self.password)
            self.assertEqual(rs[0], 'OK')
        finally:
            server.logout()

def test_logincapa(self):
        with socket_helper.transient_internet(self.host):
            _server = self.imap_class(self.host, self.port)
            self.check_logincapa(_server)

def test_logout(self):
        with socket_helper.transient_internet(self.host):
            _server = self.imap_class(self.host, self.port)
            rs = _server.logout()
            self.assertEqual(rs[0], 'BYE', rs)

if __name__ == "__main__":
    unittest.main()