code: def test_bitwise_leftshift():
      assert pixel(ImageMath.eval("Z<<0", Z=Z)) == "I 0"
      assert pixel(ImageMath.eval("Z<<1", Z=Z)) == "I 0"
      assert pixel(ImageMath.eval("A<<0", A=A)) == "I 1"
      assert pixel(ImageMath.eval("A<<1", A=A)) == "I 2"
  
imports: from __future__ import annotations
  import pytest
  from PIL import Image, ImageMath
label_desc: Use image node_id 17 for calling a global function with example usage: test_bitwise_leftshift() without return types