code: def test_slice_speed():
      clip = BitmapClip([["A"], ["B"], ["C"], ["D"]], fps=1)
      clip1 = clip[::0.5]  # 1/2x speed
      target1 = BitmapClip(
          [["A"], ["A"], ["B"], ["B"], ["C"], ["C"], ["D"], ["D"]],
          fps=1,
      )
      assert clip1 == target1
  
imports: import copy
  import os
  import numpy
  from PIL import Image
  import pytest
  from moviepy.audio.AudioClip import AudioClip
  from moviepy.audio.io.AudioFileClip import AudioFileClip
  from moviepy.tools import convert_to_seconds
  from moviepy.video.compositing.CompositeVideoClip import CompositeVideoClip
  from moviepy.video.fx.mask_color import mask_color
  from moviepy.video.fx.multiply_speed import multiply_speed
  from moviepy.video.io.VideoFileClip import VideoFileClip
  from moviepy.video.VideoClip import BitmapClip, ColorClip, ImageClip, VideoClip
label_desc: Use image node_id 36 for calling a global function with example usage: test_slice_speed() without return types