old_contents: import unittest
  
  from dict_utils import dict_utils
  
  class DictUtilsTestCase(unittest.TestCase):
  
      def test_dict_search(self):
          pass
  
new_contents: import unittest
  
  from dict_utils import dict_utils
  
  class DictUtilsTestCase(unittest.TestCase):
  
      def test_dict_search_found(self):
          dict_1 = {'first_level': {'second_level': {'name': 'Joe', 'Age': 30}}}
          found_value = dict_utils.dict_search_value(dict_1, 'name')
          self.assertEqual(found_value, 'Joe', 'Key not found in the given dict')
  
      def test_dict_search_not_found(self):
          dict_1 = {'first_level': {'second_level': {'name': 'Joe', 'Age': 30}}}
          found_value = dict_utils.dict_search_value(dict_1, 'address')
          self.assertNotEquals(found_value, 'London (UK)', 'Key not found in the given dict')
  
      def test_dict_search_different_value(self):
          dict_1 = {'first_level': {'second_level': {'name': 'Joe', 'Age': 30}}}
          found_value = dict_utils.dict_search_value(dict_1, 'name')
          self.assertNotEquals(found_value, 'Paul', 'Found value is not different')
  
      def test_compare_assert_dicts_identical(self):
          dict_1 = {'first_level': {'second_level': {'name': 'Joe', 'Age': 30}}}
          dict_2 = {'first_level': {'second_level': {'name': 'Joe', 'Age': 30}}}
          dict_utils.compare_assert_dicts(self, ['name', 'age'], dict_1, dict_2)
  
      def test_compare_assert_dicts_different_same_values(self):
          dict_1 = {'first_level': {'second_level': {'name': 'Joe', 'Age': 30}}}
          dict_2 = {'level_1': {'level_2': {'name': 'Joe', 'Age': 30}}}
          dict_utils.compare_assert_dicts(self, ['name', 'age'], dict_1, dict_2)
  
      def test_compare_assert_dicts_different_keys_structure_same_values(self):
          dict_1 = {'first_level': {'second_level': {'name': 'Joe', 'Age': 30}}}
          dict_2 = {'level_1': {'name': 'Joe', 'Age': 30}}
          dict_utils.compare_assert_dicts(self, ['name', 'age'], dict_1, dict_2)
  
subject: Add some tests for the implemented methods