code: def test_epub_anchor_id(app):
      app.build()
  
      html = (app.outdir / "index.xhtml").read_text(encoding="utf8")
      assert (
          '<p id="std-setting-STATICFILES_FINDERS">'
          "blah blah blah</p>" in html
      )
      assert (
          '<span id="std-setting-STATICFILES_SECTION"></span>'
          "<h1>blah blah blah</h1>" in html
      )
      assert (
          'see <a class="reference internal" href="#std-setting-STATICFILES_FINDERS">'
          in html
      )
  
imports: import os
  import subprocess
  from pathlib import Path
  from subprocess import CalledProcessError
  from xml.etree import ElementTree
  import pytest
  from sphinx.builders.epub3 import _XML_NAME_PATTERN
label_desc: Use image node_id 7 for calling a global function with example usage: test_epub_anchor_id(app) without return types