code: def test_construct_no_json_or_filename(self) -> None:
      with pytest.raises(ValueError) as exc:
          Theme()
      assert "requires json or a filename" in repr(exc.value)
  
imports: from __future__ import annotations
  import pytest
  import os
  import tempfile
  from bokeh.core.properties import Int, String
  from bokeh.core.property_mixins import FillProps, LineProps, TextProps
  from bokeh.document import Document
  from bokeh.model import Model
  from bokeh.plotting import figure
  from bokeh.util.deprecation import BokehDeprecationWarning
  from bokeh.themes import Theme, built_in_themes, DARK_MINIMAL, LIGHT_MINIMAL
label_desc: Use image node_id 3 for calling the TestThemes obj's underlying member method code with example usage: obj.test_construct_no_json_or_filename() without return types