code: def test_monochrome(tmp_path):
      # Arrange
      mode = "1"
  
      # Act / Assert
      helper_save_as_palm(tmp_path, mode)
      roundtrip(tmp_path, mode)
  
file_path: pillow-simd/Tests/test_file_palm.py
imports: import os.path
  import subprocess
  import pytest
  from PIL import Image
  from .helper import assert_image_equal, hopper, magick_command
label_desc: Use image node_id 4 for calling a global function with example usage: test_monochrome(tmp_path) without return types