code: def test_login(client, auth):
      # test that viewing the page renders without template errors
      assert client.get("/auth/login").status_code == 200
  
      # test that successful login redirects to the index page
      response = auth.login()
      assert response.headers["Location"] == "/"
  
      # login request set the user_id in the session
      # check that the user is loaded from the session
      with client:
          client.get("/")
          assert session["user_id"] == 1
          assert g.user.username == "test"
  
file_path: flask-sqlalchemy/examples/flaskr/tests/test_auth.py
imports: import pytest
  from flask import g
  from flask import session
  from flaskr import db
  from flaskr.auth.models import User
label_desc: Use image node_id 4 for calling a global function with example usage: test_login(client, auth) without return types