code: def test_redis(self):
      cache = RedisCache("predict", max_size=2)
      try:
          self.cache_test(cache)
      except redis.ConnectionError as e:
          # Skip test for redis if no redis installed
          warnings.warn(f"redis is not available: {e}")
          print(traceback.format_exc())
  
file_path: mindsdb/tests/unit/test_cache.py
imports: import datetime
  import time
  import unittest
  import traceback
  import redis
  import warnings
  import tempfile
  import json
  import os
  import pandas
  from mindsdb.utilities.cache import get_cache, RedisCache, FileCache, dataframe_checksum
label_desc: Use image node_id 2 for calling the TestCashe obj's underlying member method code with example usage: obj.test_redis() without return types