code: def test_post_login(self):
      io = Interface(lambda x: x, "text", "text")
      app, _, _ = io.launch(
          auth=("test", "correct_password"),
          prevent_thread_lock=True,
      )
      client = TestClient(app)
  
      response = client.post(
          "/login",
          data={"username": "test", "password": "correct_password"},
      )
      assert response.status_code == 200
      response = client.post(
          "/login",
          data={"username": "test", "password": "incorrect_password"},
      )
      assert response.status_code == 400
  
      response = client.post(
          "/login",
          data={"username": " test ", "password": "correct_password"},
      )
      assert response.status_code == 200
  
imports: import functools
  import os
  import tempfile
  from contextlib import asynccontextmanager, closing
  from unittest import mock
  import gradio_client
  import numpy
  import pandas
  import pytest
  import starlette.routing
  from fastapi import FastAPI
  from fastapi.testclient import TestClient
  from gradio_client import media_data
  import gradio
  from gradio import Blocks, Button, Interface, Number, Textbox, close_all, routes, wasm_utils
  from gradio.route_utils import FnIndexInferError
label_desc: Use image node_id 1 for calling the TestAuthenticatedRoutes obj's underlying member method code with example usage: obj.test_post_login() without return types