code: def test_StepInterpolator() -> None:
      stept_interpolator = StepInterpolator()
      assert stept_interpolator.mode == "after"
  
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 5 for calling a global function with example usage: test_StepInterpolator() without return types