code: def test_initial_setup(app: Page):
      """Initial setup: ensure charts are loaded."""
      expect(
          app.locator(".stGraphVizChart > svg > g > title")
      ).to_have_count(6)
  
file_path: streamlit/e2e_playwright/st_graphviz_chart_test.py
imports: from playwright.sync_api import Page, expect
  from e2e_playwright.conftest import ImageCompareFunction, wait_for_app_run
label_desc: Use image node_id 3 for calling a global function with example usage: test_initial_setup(app) without return types