code: def test():
      log = Path("log.txt")
      if log.is_file():
          os.remove(log)  # pragma: no cover
      response = client.post("/send-notification/foo@example.com")
      assert response.status_code == 200, response.text
      assert response.json() == {
          "message": "Notification sent in the background"
      }
      with open("./log.txt") as f:
          assert (
              "notification for foo@example.com: some notification"
              in f.read()
          )
  
imports: import os
  from pathlib import Path
  from fastapi.testclient import TestClient
  from docs_src.background_tasks.tutorial001 import app
label_desc: Use image node_id 1 for calling a global function with example usage: test() without return types