code: def test_read_doc_id():
      doc = CoNLL.conll2doc(
          input_str=ESTONIAN_DOC_ID, ignore_gapping=False
      )
      assert "{:C}".format(doc) == ESTONIAN_DOC_ID
      assert doc.sentences[0].doc_id == "this_is_a_doc"
  
imports: import io
  import pytest
  import tempfile
  from zipfile import ZipFile
  import stanza
  from stanza.utils.conll import CoNLL
  from stanza.models.common.doc import Document
  from stanza.tests import *
label_desc: Use image node_id 18 for calling a global function with example usage: test_read_doc_id() without return types