code: def test_application_route_prefix_override1(
      serve_instance, ingress_route
  ):
      """
      Don't set route prefix in serve.run, check it always uses the ingress deployment
      route.
      """
  
      @serve.deployment
      def f():
          return "hello"
  
      node = f.options(route_prefix=ingress_route).bind()
      serve.run(node)
      if ingress_route is None:
          routes = requests.get("http://localhost:8000/-/routes").json()
          assert len(routes) == 0
      else:
          assert (
              requests.get(f"http://localhost:8000{ingress_route}").text
              == "hello"
          )
  
imports: import asyncio
  import os
  import sys
  from typing import Dict, Optional
  import pytest
  import requests
  import starlette.responses
  from fastapi import FastAPI
  import ray
  from ray import serve
  from ray._private.pydantic_compat import BaseModel, ValidationError
  from ray._private.test_utils import SignalActor, wait_for_condition
  from ray.serve._private.api import call_app_builder_with_args_if_necessary
  from ray.serve._private.common import DeploymentID
  from ray.serve._private.constants import SERVE_DEFAULT_APP_NAME
  from ray.serve.deployment import Application
  from ray.serve.exceptions import RayServeException
  from ray.serve.handle import DeploymentHandle, RayServeHandle
label_desc: Use image node_id 25 for calling a global function with example usage: test_application_route_prefix_override1(serve_instance, ingress_route) and returns: str