code: def test_CustomJSTransform() -> None:
      custom_js_transform = CustomJSTransform()
      assert custom_js_transform.func == ""
      assert custom_js_transform.v_func == ""
  
file_path: bokeh/tests/unit/bokeh/models/test_transforms.py
imports: from __future__ import annotations
  import pytest
  from bokeh.models import CustomJSTransform, Dodge, Interpolator, Jitter, StepInterpolator
label_desc: Use image node_id 1 for calling a global function with example usage: test_CustomJSTransform() without return types