Generate list of random integers.

        :param amount: Amount of elements.
        :param a: Minimum value of range.
        :param b: Maximum value of range.
        :return: List of random integers.
        :raises ValueError: if amount less or equal to zero.

def randints(self, amount: int = 3,
                 a: int = 1, b: int = 100) -> List[int]:
        """Generate list of random integers.

        :param amount: Amount of elements.
        :param a: Minimum value of range.
        :param b: Maximum value of range.
        :return: List of random integers.
        :raises ValueError: if amount less or equal to zero.
        """
        if amount <= 0:
            raise ValueError('Amount out of range.')

        return [int(self.random() * (b - a)) + a
                for _ in range(amount)]