code: def my_post_call_rule(input: str):
      input = input.lower()
      print(f"input: {input}")
      print(f"INSIDE MY POST CALL RULE, len(input) - {len(input)}")
      if len(input) < 200:
          return {
              "decision": False,
              "message": "This violates LiteLLM Proxy Rules. Response too short",
          }
      return {"decision": True}
  
file_path: litellm/litellm/tests/test_rules.py
imports: import sys, os, time
  import traceback, asyncio
  import pytest
  import litellm
  from litellm import completion, acompletion
label_desc: Use image node_id 3 for calling a global function with example usage: my_post_call_rule(input) and returns: dict, dict