code: def test_get_longest_non_repeat_v2(self):
      string = "abcabcbb"
      self.assertEqual(get_longest_non_repeat_v2(string), (3, "abc"))
  
      string = "bbbbb"
      self.assertEqual(get_longest_non_repeat_v2(string), (1, "b"))
  
      string = "pwwkew"
      self.assertEqual(get_longest_non_repeat_v2(string), (3, "wke"))
  
      string = "dvdf"
      self.assertEqual(get_longest_non_repeat_v2(string), (3, "vdf"))
  
      string = "asjrgapa"
      self.assertEqual(get_longest_non_repeat_v2(string), (6, "sjrgap"))
  
imports: from algorithms.arrays import delete_nth, delete_nth_naive, flatten_iter, flatten, garage, josephus, longest_non_repeat_v1, longest_non_repeat_v2, get_longest_non_repeat_v1, get_longest_non_repeat_v2, Interval, merge_intervals, missing_ranges, move_zeros, plus_one_v1, plus_one_v2, plus_one_v3, rotate_v1, rotate_v2, rotate_v3, summarize_ranges, three_sum, two_sum, max_ones_index, trimmean, top_1, limit, n_sum
  import unittest
label_desc: Use image node_id 4 for calling the TestLongestNonRepeat obj's underlying member method code with example usage: obj.test_get_longest_non_repeat_v2() without return types