code: def skip_if_windows(cls):
      """Skip a test if run on windows"""
      decorator = unittest.skipIf(
          platform.system() == "Windows",
          "Not supported on Windows",
      )
      return decorator(cls)
  
imports: import re
  import os
  import sys
  import types
  import ctypes
  import select
  import operator
  import platform
  import unittest
  from functools import wraps
  from ctypes.util import find_library
  from io import StringIO
  from io import TextIOBase
  from importlib import reload
  import psycopg2
  import psycopg2.errors
  import psycopg2.extensions
  from .testconfig import green, dsn, repl_dsn
label_desc: Use image node_id 15 for calling a global function with example usage: skip_if_windows(cls) and returns: decorator