code: def test_redeploy_scale_up(serve_instance, use_handle):
      # Tests redeploying with a new version and higher num_replicas.
      name = "test"
  
      @serve.deployment(name=name, version="1", num_replicas=2)
      def v1(*args):
          return f"1|{os.getpid()}"
  
      @ray.remote(num_cpus=0)
      def call():
          if use_handle:
              handle = serve.get_app_handle("app")
              ret = handle.remote().result()
          else:
              ret = requests.get(f"http://localhost:8000/{name}").text
  
          return ret.split("|")[0], ret.split("|")[1]
  
      def make_calls(expected):
          # Returns dict[val, set(pid)].
          responses = defaultdict(set)
          start = time.time()
          while time.time() - start < 30:
              refs = [call.remote() for _ in range(10)]
              ready, not_ready = ray.wait(refs, timeout=5)
              for ref in ready:
                  val, pid = ray.get(ref)
                  responses[val].add(pid)
  
              if all(
                  len(responses[val]) == num
                  for val, num in expected.items()
              ):
                  break
          else:
              assert False, f"Timed out, responses: {responses}."
  
          return responses
  
      serve.run(v1.bind(), name="app")
      responses1 = make_calls({"1": 2})
      pids1 = responses1["1"]
  
      @serve.deployment(name=name, version="2", num_replicas=4)
      def v2(*args):
          return f"2|{os.getpid()}"
  
      serve.run(v2.bind(), name="app")
      responses2 = make_calls({"2": 4})
      assert all(pid not in pids1 for pid in responses2["2"])
  
imports: import os
  import sys
  import time
  from collections import defaultdict
  from typing import Callable
  import pytest
  import requests
  import ray
  from ray import serve
  from ray._private.pydantic_compat import ValidationError
  from ray._private.test_utils import SignalActor
  from ray.serve._private.utils import get_random_string
  from ray.serve.exceptions import RayServeException
label_desc: Use image node_id 9 for calling a global function with example usage: test_redeploy_scale_up(serve_instance, use_handle) and returns: str, os, ret,  ret, responses, str, os