code: def test_normalize_lower(doc_long_en):
      result = kt.sgrank(doc_long_en, normalize="lower")
      assert len(result) > 0
      assert all(term == term.lower() for term, _ in result)
  
file_path: textacy/tests/extract/keyterms/test_sgrank.py
imports: import pytest
  import textacy
  from textacy.extract import keyterms
label_desc: Use image node_id 7 for calling a global function with example usage: test_normalize_lower(doc_long_en) without return types