code: def skip_if_no(operator_name):
      return pytest.mark.skipif(
          not have(operator_name),
          reason=("no {}, skipping test".format(operator_name)),
      )
  
file_path: pyvips/tests/helpers/helpers.py
imports: import os
  import sys
  import tempfile
  import pytest
  import pyvips
label_desc: Use image node_id 5 for calling a global function with example usage: skip_if_no(operator_name) and returns: pytest