from itertools import cycle

from random import randrange

from signal import SIGINT

from twisted.python.reflect import ObjectNotFound, namedAny

try:

    namedAny("fcntl.ioctl")

from zope.interface import Interface, implementer

from zope.interface.verify import verifyObject

    def createSystem(self):

import re

from io import BytesIO

from typing import Any, List, Optional, Tuple, Type

from zope.interface import directlyProvides, implementer

from twisted.test.proto_helpers import MemoryReactor, StringTransport

from twisted.trial.unittest import TestCase

try:

    from twisted.test.ssl_helpers import ClientTLSContext, ServerTLSContext

except ImportError:

    sslSkip = "OpenSSL not present"

if not interfaces.IReactorSSL.providedBy(reactor):

        self.tls = True

class TLSTests(TestCase, LoopbackMixin):

    def testTLS(self):

        clientCTX = ClientTLSContext()

        serverCTX = ServerTLSContext()

        self.assertEqual(b"HELO testuser\r\n", transport.value())

class SSLTestCase(TestCase):

    SERVER_GREETING = b"220 localhost NO UCE NO UBE NO RELAY PROBES ESMTP\r\n"

    EHLO_RESPONSE = b"250-localhost Hello 127.0.0.1, nice to meet you\r\n"

pyasn1 = requireModule("pyasn1")

cryptography = requireModule("cryptography")

if pyasn1 and cryptography:

    from cryptography.exceptions import UnsupportedAlgorithm

    from cryptography.hazmat.backends import default_backend

    from cryptography.hazmat.primitives import serialization

import errno

import os

import sys

try:

    import fcntl

    from twisted.internet import process

from twisted.trial.unittest import TestCase

class FDDetectorTests(TestCase):

    devfs = False

    accurateDevFDResults = False

class FileDescriptorTests(TestCase):

    def test_openFDs(self):

from twisted.test import proto_helpers

from twisted.trial import unittest

class FakeResolver(ResolverBase):

    def test_interface(self):

    def _hostsTest(self, resolver, filename):

        res = [r for r in resolver.resolvers if isinstance(r, hosts.Resolver)]

import random

import string

from io import BytesIO

from zope.interface import implementer

from zope.interface.verify import verifyClass

from twisted.test import proto_helpers

from twisted.trial.unittest import TestCase

class Dummy(basic.LineReceiver):

        self.assertEqual(filepath.FilePath("/home/alice@example.com"), home)

class SystemFTPRealmTests(TestCase):

    def test_getHomeDirectory(self):