code: def setup_class(cls):
      cls.tempdir = tempfile.mkdtemp()
  
imports: import tempfile
  import pytest
  import pyvips
  from helpers import skip_if_no, JPEG_FILE, WEBP_FILE, SVG_FILE
label_desc: Use image node_id 1 for calling the TestBlock obj's underlying member method code with example usage: obj.setup_class(cls) without return types