def get_has_been_seen(request):
    """Return ``True`` if the request has the ``has_been_seen_before`` cookie.
      
          >>> from mock import Mock
          >>> mock_request = Mock()
      
      False if the request doesn't have the cookie::
      
          >>> mock_request.cookies = {}
          >>> get_has_been_seen(mock_request)
          False
      
      True if the request does::
      
          >>> mock_request.cookies = {'has_been_seen_before': 'true'}
          >>> get_has_been_seen(mock_request)
          True
      
    """
    return bool(request.cookies.get('has_been_seen_before', False))
