code: def url_open_auth(self, username: str, url: str):
      admin_user = security_manager.find_user(username=username)
      cookies = machine_auth_provider_factory.instance.get_auth_cookies(
          admin_user
      )
      opener = urllib.request.build_opener()
      opener.addheaders.append(
          ("Cookie", f"session={cookies['session']}")
      )
      return opener.open(f"{self.get_server_url()}/{url}")
  
imports: import json
  import urllib.request
  from io import BytesIO
  from unittest import skipUnless
  from unittest.mock import ANY, call, MagicMock, patch
  import pytest
  from flask_testing import LiveServerTestCase
  from sqlalchemy.sql import func
  from superset import db, is_feature_enabled, security_manager
  from superset.extensions import machine_auth_provider_factory
  from superset.models.dashboard import Dashboard
  from superset.models.slice import Slice
  from superset.tasks.types import ExecutorType
  from superset.utils.screenshots import ChartScreenshot, DashboardScreenshot
  from superset.utils.urls import get_url_path
  from superset.utils.webdriver import WebDriverSelenium
  from tests.integration_tests.conftest import with_feature_flags
  from tests.integration_tests.fixtures.birth_names_dashboard import load_birth_names_dashboard_with_slices, load_birth_names_data
  from tests.integration_tests.test_app import app
  from .base_tests import SupersetTestCase
label_desc: Use image node_id 2 for calling the TestThumbnailsSeleniumLive obj's underlying member method code with example usage: obj.url_open_auth(username, url) and returns: opener