code: def test_subsets_unique(self):
      nums1 = [1, 2, 2]
      answer1 = [(1, 2), (1,), (1, 2, 2), (2,), (), (2, 2)]
      self.assertEqual(sorted(subsets_unique(nums1)), sorted(answer1))
  
      nums2 = [1, 2, 3, 4]
      answer2 = [
          (1, 2),
          (1, 3),
          (1, 2, 3, 4),
          (1,),
          (2,),
          (3,),
          (1, 4),
          (1, 2, 3),
          (4,),
          (),
          (2, 3),
          (1, 2, 4),
          (1, 3, 4),
          (2, 3, 4),
          (3, 4),
          (2, 4),
      ]
      self.assertEqual(sorted(subsets_unique(nums2)), sorted(answer2))
  
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 1 for calling the TestSubsetsUnique obj's underlying member method code with example usage: obj.test_subsets_unique() without return types