code: def test_fluent_health_check_on_env_var_uri(gateway, monkeypatch):
      monkeypatch.setenv(MLFLOW_GATEWAY_URI.name, gateway.url)
      mlflow.gateway.utils._gateway_uri = None
      assert get_route("completions").model.name == "text-davinci-003"
  
imports: from unittest import mock
  import pytest
  from requests.exceptions import HTTPError
  import mlflow.gateway.utils
  from mlflow.environment_variables import MLFLOW_GATEWAY_URI
  from mlflow.exceptions import MlflowException
  from mlflow.gateway import create_route, delete_route, get_gateway_uri, get_limits, get_route, query, search_routes, set_gateway_uri, set_limits
  from mlflow.gateway.config import Route
  from mlflow.gateway.constants import MLFLOW_GATEWAY_SEARCH_ROUTES_PAGE_SIZE
  from mlflow.gateway.utils import resolve_route_url
  from tests.gateway.tools import Gateway, save_yaml
label_desc: Use image node_id 6 for calling a global function with example usage: test_fluent_health_check_on_env_var_uri(gateway, monkeypatch) without return types