code: def mock_create_notification(faker) -> CreateNotification:
      test_signing_key1 = SyftSigningKey.generate()
      test_verify_key1 = test_signing_key1.verify_key
      test_signing_key2 = SyftSigningKey.generate()
      test_verify_key2 = test_signing_key2.verify_key
  
      mock_notification = CreateNotification(
          subject="mock_created_notification",
          id=UID(),
          node_uid=UID(),
          from_user_verify_key=test_verify_key1,
          to_user_verify_key=test_verify_key2,
          created_at=DateTime.now(),
      )
  
      return mock_notification
  
file_path: PySyft/packages/syft/tests/syft/notifications/fixtures.py
imports: import pytest
  from syft.node.credentials import SyftSigningKey
  from syft.node.credentials import SyftVerifyKey
  from syft.node.worker import Worker
  from syft.service.context import AuthedServiceContext
  from syft.service.notification.notification_service import NotificationService
  from syft.service.notification.notification_stash import NotificationStash
  from syft.service.notification.notifications import CreateNotification
  from syft.service.notification.notifications import Notification
  from syft.service.user.user import User
  from syft.store.linked_obj import LinkedObject
  from syft.types.datetime import DateTime
  from syft.types.uid import UID
label_desc: Use image node_id 5 for calling a global function with example usage: mock_create_notification(faker) and returns: mock_notification