'If the server response to a I{SELECT} or I{EXAMINE} command includes an
I{UIDNEXT} response, the L{Deferred} returned by L{IMAP4Client.select}
or L{IMAP4Client.examine} fires with a C{dict} including the value
associated with the C{\'UIDNEXT\'} key.'

def test_uidnext(self):

    d = self._examineOrSelect()
    self._response('*    OK    [UIDNEXT    4392]    Predicted    next    UID')
    self.assertEqual(self._extractDeferredResult(d), {'READ-WRITE': False, 'UIDNEXT': 4392})
