code: def test_permute_iter(self):
      it = permute_iter("abc")
      perms = ["abc", "bac", "bca", "acb", "cab", "cba"]
      for i in range(len(perms)):
          self.assertEqual(perms[i], next(it))
  
imports: from algorithms.backtrack import add_operators, permute_iter, anagram, array_sum_combinations, unique_array_sum_combinations, combination_sum, get_factors, recursive_get_factors, find_words, generate_abbreviations, generate_parenthesis_v1, generate_parenthesis_v2, letter_combinations, palindromic_substrings, pattern_match, permute_unique, permute, permute_recursive, subsets_unique, subsets, subsets_v2
  import unittest
label_desc: Use image node_id 2 for calling the TestPermuteAndAnagram obj's underlying member method code with example usage: obj.test_permute_iter() without return types