code: def test_put_duplicate_routes(ray_start_stop, url):
      """If a config with duplicate routes is deployed, the PUT request should fail.
      The response should clearly indicate a validation error.
      """
  
      config = {
          "applications": [
              {
                  "name": "app1",
                  "route_prefix": "/alice",
                  "import_path": "module.graph",
              },
              {
                  "name": "app2",
                  "route_prefix": "/alice",
                  "import_path": "module.graph",
              },
          ],
      }
      put_response = requests.put(url, json=config, timeout=5)
      assert (
          put_response.status_code == 400
          and "ValidationError" in put_response.text
      )
  
imports: import copy
  import grpc
  import re
  import os
  import sys
  from typing import Dict
  import pytest
  import requests
  import ray
  from ray import serve
  from ray._private.test_utils import wait_for_condition
  import ray._private.ray_constants
  from ray.util.state import list_actors
  from ray.serve._private.constants import SERVE_NAMESPACE
  from ray.serve.tests.conftest import *
  from ray.tests.conftest import *
  from ray._private.test_utils import generate_system_config_map
  from ray.serve.schema import ServeInstanceDetails, HTTPOptionsSchema
  from ray.serve._private.common import ApplicationStatus, DeploymentStatus, DeploymentStatusTrigger, ReplicaState, ProxyStatus
  from ray.serve.generated import serve_pb2, serve_pb2_grpc
label_desc: Use image node_id 5 for calling a global function with example usage: test_put_duplicate_routes(ray_start_stop, url) without return types