code: def test_config_backreferences(config_app):
      """Test no warning is issued under the new configuration"""
  
      cfg = config_app.config
      assert cfg.project == "Sphinx-Gallery <Tests>"
      assert cfg.sphinx_gallery_conf[
          "backreferences_dir"
      ] == os.path.join("gen_modules", "backreferences")
      build_warn = config_app._warning.getvalue()
      assert build_warn == ""
  
file_path: tensorly/doc/sphinx_ext/sphinx_gallery/tests/test_gen_gallery.py
imports: from __future__ import division, absolute_import, print_function, unicode_literals
  import os
  import tempfile
  import shutil
  import pytest
  from sphinx.application import Sphinx
  from sphinx.errors import ExtensionError
  from sphinx_gallery.gen_rst import MixedEncodingStringIO
  from sphinx_gallery.gen_gallery import DEFAULT_GALLERY_CONF
  from sphinx_gallery import sphinx_compatibility
label_desc: Use image node_id 7 for calling a global function with example usage: test_config_backreferences(config_app) without return types