code: def test_default(self) -> None:
      assert bes._clean_url(
          "default"
      ) == bes.DEFAULT_SERVER_HTTP_URL.rstrip("/")
  
imports: from __future__ import annotations
  import pytest
  import bs4
  import bokeh.embed.server
label_desc: Use image node_id 1 for calling the Test__clean_url obj's underlying member method code with example usage: obj.test_default() without return types