class_docstr: Test that the search algorithm works correctly with the
  Levenshtein distance comparison function.
class_docstr_tok: ["Test","that","the","search","algorithm","works","correctly","with","the","Levenshtein","distance","comparison","function","."]
code: def test_confidence_no_match(self):
      from unittest.mock import MagicMock
  
      # Assume that the storage adapter returns a partial match
      self.search_algorithm.chatbot.storage.filter = MagicMock(
          return_value=[Statement(text="xxx", in_response_to="xxx")]
      )
  
      statement = Statement(text="yyy")
      results = list(self.search_algorithm.search(statement))
  
      self.assertIsLength(results, 0)
  
imports: from tests.base_case import ChatBotTestCase
  from chatterbot.conversation import Statement
  from chatterbot.search import TextSearch, IndexedTextSearch
  from chatterbot import comparisons
label_desc: Use image node_id 5 for calling the IndexedTextSearchComparisonFunctionLevenshteinDistanceComparisonTests obj's underlying member method code with example usage: obj.test_confidence_no_match() without return types