code: def test_context_window_with_fallbacks(model):
      ctx_window_fallback_dict = {
          "command-nightly": "claude-2",
          "gpt-3.5-turbo-instruct": "gpt-3.5-turbo-16k",
          "azure/chatgpt-v-2": "gpt-3.5-turbo-16k",
      }
      sample_text = (
          "how does a court case get to the Supreme Court?" * 1000
      )
      messages = [{"content": sample_text, "role": "user"}]
  
      completion(
          model=model,
          messages=messages,
          context_window_fallback_dict=ctx_window_fallback_dict,
      )
  
file_path: litellm/litellm/tests/test_exceptions.py
imports: from openai import AuthenticationError, BadRequestError, RateLimitError, OpenAIError
  import os
  import sys
  import traceback
  import subprocess
  import litellm
  from litellm import embedding, completion, ContextWindowExceededError
  from concurrent.futures import ThreadPoolExecutor
  import pytest
label_desc: Use image node_id 2 for calling a global function with example usage: test_context_window_with_fallbacks(model) without return types