code: def setup_class(cls):
      base_dir = dirname(__file__)
      build(join(base_dir, "latex_label"), rebuild=True)
  
imports: from __future__ import annotations
  import pytest
  from os.path import dirname, join
  from bokeh import models
  from bokeh.core.has_props import _default_resolver
  from bokeh.document import Document
  from bokeh.embed.bundle import URL, extension_dirs
  from bokeh.ext import build
  from bokeh.resources import CDN, INLINE, Resources
  from tests.support.util.env import envset
  import bokeh.embed.bundle
label_desc: Use image node_id 1 for calling the Test_bundle_custom_extensions obj's underlying member method code with example usage: obj.setup_class(cls) without return types