code: def mask_basic_image_base64() -> str:
      return file_to_base64(
          os.path.join(test_files_path, "mask_basic.png")
      )
  
imports: import os
  import pytest
  import base64
label_desc: Use image node_id 3 for calling a global function with example usage: mask_basic_image_base64() and returns: file_to_base64