code: def test_all_types() -> None:
      from bokeh.command.subcommand import Subcommand
  
      assert all(issubclass(x, Subcommand) for x in sc.all)
  
imports: from __future__ import annotations
  import pytest
  import bokeh.command.subcommands
label_desc: Use image node_id 2 for calling a global function with example usage: test_all_types() without return types