code: def test_authenticate(
      click_launch: mock.MagicMock,
      head: mock.MagicMock,
      run: mock.MagicMock,
      port: mock.MagicMock,
  ):
      port.return_value = 1234
      auth = login.Auth()
      auth.clear()
  
      click_launch.side_effect = lambda _: auth.save(
          "", "user_id", "api_key", "user_id"
      )
  
      auth.authenticate()
      url = f"{LIGHTNING_CLOUD_URL}/sign-in?redirectTo=http%3A%2F%2Flocalhost%3A1234%2Flogin-complete"  # E501
      head.assert_called_with(url)
      click_launch.assert_called_with(url)
      run.assert_called()
  
      assert auth.auth_header == "Basic dXNlcl9pZDphcGlfa2V5"
  
      auth.authenticate()
      assert auth.auth_header == "Basic dXNlcl9pZDphcGlfa2V5"
  
file_path: pytorch-lightning/tests/tests_app/utilities/test_login.py
imports: import os
  from unittest import mock
  import pytest
  import requests
  from lightning.app.utilities import login
label_desc: Use image node_id 6 for calling a global function with example usage: test_authenticate(click_launch, head, run, port) without return types