code: def test_len(self) -> None:
      e = bce.enumeration("foo", "bar", "baz")
      assert len(e) == 3
  
imports: from __future__ import annotations
  import pytest
  from bokeh.colors import named
  from bokeh.palettes import __palettes__
  from tests.support.util.api import verify_all
  import bokeh.core.enums
label_desc: Use image node_id 5 for calling the Test_enumeration obj's underlying member method code with example usage: obj.test_len() without return types