code: def test_mu_legibility_index_doclen(es_doc):
      assert readability.mu_legibility_index(es_doc[:2].as_doc()) > 0.0
      assert readability.mu_legibility_index(es_doc[:1].as_doc()) == 0.0
  
file_path: textacy/tests/text_stats/test_readability.py
imports: from contextlib import nullcontext
  import pytest
  import textacy
  from textacy.text_stats import readability
label_desc: Use image node_id 7 for calling a global function with example usage: test_mu_legibility_index_doclen(es_doc) without return types