docs: def get_next_token(self, length=15, **kwargs):
          """Gets the next available token.
  
          :param length: length of the token
          :param kwargs: additional filter criteria to check for when looking for
              a unique token.
  
          """
          return self.get_available_tokens(count=1,
                                           token_length=length,
                                           **kwargs)[0]