code: def test_empty_list(self):
      cleaner = DocumentCleaner()
      result = cleaner.run(documents=[])
      assert result == {"documents": []}
  
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 4 for calling the TestDocumentCleaner obj's underlying member method code with example usage: obj.test_empty_list() without return types