def createClientEndpoint(self, reactor, clientFactory, **connectArgs):
        """
        Create an L{SSL4ClientEndpoint} and return the values needed to verify
        its behaviour.

        @param reactor: A fake L{IReactorSSL} that L{SSL4ClientEndpoint} can
            call L{IReactorSSL.connectSSL} on.
        @param clientFactory: The thing that we expect to be passed to our
            L{IStreamClientEndpoint.connect} implementation.
        @param connectArgs: Optional dictionary of arguments to
            L{IReactorSSL.connectSSL}
        """
        address = IPv4Address("TCP", "localhost", 80)

        if connectArgs is None:
            connectArgs = {}

        return (endpoints.SSL4ClientEndpoint(reactor,
                                             address.host,
                                             address.port,
                                             self.clientSSLContext,
                                             **connectArgs),
                (address.host, address.port, clientFactory,
                 self.clientSSLContext,
                 connectArgs.get('timeout', 30),
                 connectArgs.get('bindAddress', None)),
                address)

        Create an L{SSL4ClientEndpoint} and return the values needed to verify
        its behaviour.

        @param reactor: A fake L{IReactorSSL} that L{SSL4ClientEndpoint} can
            call L{IReactorSSL.connectSSL} on.
        @param clientFactory: The thing that we expect to be passed to our
            L{IStreamClientEndpoint.connect} implementation.
        @param connectArgs: Optional dictionary of arguments to
            L{IReactorSSL.connectSSL}
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/internet/test/test_endpoints.py