code: def test_favicon(client: TestClient):
      response = client.get("/favicon.ico")
      assert response.status_code == 200
  
file_path: mlflow/tests/gateway/test_gateway_app.py
imports: from unittest import mock
  import pytest
  from fastapi.testclient import TestClient
  from mlflow.exceptions import MlflowException
  from mlflow.gateway.app import create_app_from_config, create_app_from_env
  from mlflow.gateway.config import GatewayConfig
  from mlflow.gateway.constants import MLFLOW_GATEWAY_CRUD_ROUTE_BASE, MLFLOW_GATEWAY_ROUTE_BASE
  from tests.gateway.tools import MockAsyncResponse
label_desc: Use image node_id 4 for calling a global function with example usage: test_favicon(client) without return types