code: def test_title():
      app = Dash()
      assert "<title>Dash</title>" in app.index()
      app = Dash()
      app.title = "Hello World"
      assert "<title>Hello World</title>" in app.index()
      app = Dash(title="Custom Title")
      assert "<title>Custom Title</title>" in app.index()
  
imports: import os
  import logging
  import pytest
  from flask import Flask
  from dash import Dash, exceptions
  from dash._configs import pathname_configs, DASH_ENV_VARS, get_combined_config, load_dash_env_vars
  from dash._utils import AttributeDict
  from dash._get_paths import app_get_asset_url, app_get_relative_path, app_strip_relative_path, get_asset_url, get_relative_path, strip_relative_path
label_desc: Use image node_id 24 for calling a global function with example usage: test_title() without return types