code: def test_init(self):
      cleaner = DocumentCleaner()
      assert cleaner.remove_empty_lines is True
      assert cleaner.remove_extra_whitespaces is True
      assert cleaner.remove_repeated_substrings is False
      assert cleaner.remove_substrings is None
      assert cleaner.remove_regex is None
  
file_path: haystack/test/components/preprocessors/test_document_cleaner.py
imports: import logging
  import pytest
  from haystack import Document
  from haystack.components.preprocessors import DocumentCleaner
label_desc: Use image node_id 1 for calling the TestDocumentCleaner obj's underlying member method code with example usage: obj.test_init() without return types