code: def test_create_cache_dir(self):
      @cache_results("demo/demo.pkl")
      def cache(s):
          return 1, 2
  
      try:
          results = cache(s=1)
          assert (1, 2) == results
      finally:
          import shutil
  
          shutil.rmtree("demo/")
  
imports: import os
  import pytest
  import subprocess
  from io import StringIO
  import sys
  from fastNLP.core.utils.cache_results import cache_results
  from fastNLP.envs.distributed import rank_zero_rm
label_desc: Use image node_id 5 for calling the TestCacheResultsWithParam obj's underlying member method code with example usage: obj.test_create_cache_dir() and returns: int,  int