code: def test_find_missing_number2(self):
      self.assertEqual(7, find_missing_number2([4, 1, 3, 0, 6, 5, 2]))
      self.assertEqual(0, find_missing_number2([1]))
      self.assertEqual(1, find_missing_number2([0]))
  
      nums = [i for i in range(100000) if i != 12345]
      random.shuffle(nums)
      self.assertEqual(12345, find_missing_number2(nums))
  
imports: from algorithms.bit import add_bitwise_operator, count_ones_iter, count_ones_recur, count_flips_to_convert, find_missing_number, find_missing_number2, flip_bit_longest_seq, is_power_of_two, reverse_bits, single_number, single_number2, single_number3, subsets, get_bit, set_bit, clear_bit, update_bit, int_to_bytes_big_endian, int_to_bytes_little_endian, bytes_big_endian_to_int, bytes_little_endian_to_int, swap_pair, find_difference, has_alternative_bit, has_alternative_bit_fast, insert_one_bit, insert_mult_bits, remove_bit, binary_gap
  import unittest
  import random
label_desc: Use image node_id 7 for calling the TestSuite obj's underlying member method code with example usage: obj.test_find_missing_number2() without return types