def test_examine(self):
        """
        L{IMAP4Client.examine} issues an I{EXAMINE} command to the server and
        returns a L{Deferred} which fires with a C{dict} with as many of the
        following keys as the server includes in its response: C{'FLAGS'},
        C{'EXISTS'}, C{'RECENT'}, C{'UNSEEN'}, C{'READ-WRITE'}, C{'READ-ONLY'},
        C{'UIDVALIDITY'}, and C{'PERMANENTFLAGS'}.

        Unfortunately the server doesn't generate all of these so it's hard to
        test the client's handling of them here.  See
        L{IMAP4ClientExamineTests} below.

        See U{RFC 3501<http://www.faqs.org/rfcs/rfc3501.html>}, section 6.3.2,
        for details.
        """
        SimpleServer.theAccount.addMailbox('test-mailbox')
        self.examinedArgs = None
        def login():
            return self.client.login(b'testuser', b'password-test')
        def examine():
            def examined(args):
                self.examinedArgs = args
                self._cbStopClient(None)
            d = self.client.examine('test-mailbox')
            d.addCallback(examined)
            return d

        d1 = self.connected.addCallback(strip(login))
        d1.addCallback(strip(examine))
        d1.addErrback(self._ebGeneral)
        d2 = self.loopback()
        d = defer.gatherResults([d1, d2])
        return d.addCallback(self._cbTestExamine)

        L{IMAP4Client.examine} issues an I{EXAMINE} command to the server and
        returns a L{Deferred} which fires with a C{dict} with as many of the
        following keys as the server includes in its response: C{'FLAGS'},
        C{'EXISTS'}, C{'RECENT'}, C{'UNSEEN'}, C{'READ-WRITE'}, C{'READ-ONLY'},
        C{'UIDVALIDITY'}, and C{'PERMANENTFLAGS'}.

        Unfortunately the server doesn't generate all of these so it's hard to
        test the client's handling of them here.  See
        L{IMAP4ClientExamineTests} below.

        See U{RFC 3501<http://www.faqs.org/rfcs/rfc3501.html>}, section 6.3.2,
        for details.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/mail/test/test_imap.py