code: def test_get_files_exclude_readme_with_index(self, tdir):
      config = load_config(docs_dir=tdir)
      with self.assertLogs("mkdocs") as cm:
          files = get_files(config)
      self.assertRegex(
          "\n".join(cm.output),
          r"^WARNING:mkdocs.structure.files:"
          r"Excluding 'README.md' from the site because it conflicts with 'index.md'.$",
      )
      self.assertIsInstance(files, Files)
      self.assertEqual(
          [f.src_uri for f in files], ["index.md", "foo.md"]
      )
  
imports: import os
  import sys
  import unittest
  from unittest import mock
  from mkdocs.structure.files import File, Files, _sort_files, get_files
  from mkdocs.tests.base import PathAssertionMixin, load_config, tempdir
label_desc: Use image node_id 20 for calling the TestFiles obj's underlying member method code with example usage: obj.test_get_files_exclude_readme_with_index(tdir) without return types