code: def test_multiply_white():
      """If you multiply with a solid white image, the image is unaffected."""
      # Arrange
      im1 = hopper()
      white = Image.new("RGB", im1.size, "white")
  
      # Act
      new = ImageChops.multiply(im1, white)
  
      # Assert
      assert_image_equal(new, im1)
  
imports: from __future__ import annotations
  from PIL import Image, ImageChops
  from .helper import assert_image_equal, hopper
label_desc: Use image node_id 19 for calling a global function with example usage: test_multiply_white() without return types