code: def test_arg(self) -> None:
      assert bes._clean_url("http://foo/bar") == "http://foo/bar"
      assert bes._clean_url("http://foo/bar/") == "http://foo/bar"
  
imports: from __future__ import annotations
  import pytest
  import bs4
  import bokeh.embed.server
label_desc: Use image node_id 3 for calling the Test__clean_url obj's underlying member method code with example usage: obj.test_arg() without return types