text: const { solution, defaultInput } = require('./');
  
  test('Provided test cases', () => {
      expect(solution('13195')).toBe(29);
  });
  
  test('Custom test cases', () => {
      expect(solution('-1')).toBeUndefined();
      expect(solution('0')).toBeUndefined();
      expect(solution('1')).toBeUndefined();
      expect(solution('2')).toBe(2);
      expect(solution('3')).toBe(3);
      expect(solution('10')).toBe(5);
      expect(solution('8008135')).toBe(1601627);
      expect(solution(Number.MAX_SAFE_INTEGER.toString())).toBe(20394401);
  });
  
  test('Problem input', () => {
      expect(solution(defaultInput)).toBe(6857);
  });
  