'All of the response code globals (for example C{RESTART_MARKER_REPLY} or
C{USR_NAME_OK_NEED_PASS}) have unique values and are present in the
C{RESPONSE} dictionary.'

def test_unique(self):

    allValues = set(ftp.RESPONSE)
    seenValues = set()
    for (key, value) in vars(ftp).items():
        if (isinstance(value, str) and key.isupper()):
            self.assertIn(value, allValues, ('Code    %r    with    value    %r    missing    from    RESPONSE    dict' % (key, value)))
            self.assertNotIn(value, seenValues, ('Duplicate    code    %r    with    value    %r' % (key, value)))
            seenValues.add(value)
