code: def test_inspect_main_noargs(capsys):
      """inspect_main interface, without arguments"""
      assert inspect_main([]) == 1
  
      expected = (
          "Print out an inventory file.\n"
          "Error: must specify local path or URL to an inventory file."
      )
      stdout, stderr = capsys.readouterr()
      assert stdout == ""
      assert stderr == expected + "\n"
  
imports: import http.server
  from unittest import mock
  import pytest
  from docutils import nodes
  from sphinx import addnodes
  from sphinx.ext.intersphinx import INVENTORY_FILENAME, _get_safe_url, _strip_basic_auth, fetch_inventory, inspect_main, load_mappings, missing_reference, normalize_intersphinx_mapping
  from sphinx.ext.intersphinx import setup
  from tests.test_util.test_util_inventory import inventory_v2, inventory_v2_not_having_version
  from tests.utils import http_server
label_desc: Use image node_id 17 for calling a global function with example usage: test_inspect_main_noargs(capsys) without return types