code: def test_convert():
      im = original.copy()
  
      verify(im.convert("I;16"))
      verify(im.convert("I;16").convert("L"))
      verify(im.convert("I;16").convert("I"))
  
      verify(im.convert("I;16B"))
      verify(im.convert("I;16B").convert("L"))
      verify(im.convert("I;16B").convert("I"))
  
imports: from PIL import Image
  from .helper import hopper
label_desc: Use image node_id 4 for calling a global function with example usage: test_convert() without return types