[CHORE] cleanup cache and exception on make test (#1899)

* [CHORE] cleanup cache and exception on `make test`

moved the invalidate_forever task to proper location and use `create_permanent_task`.
and there was a Task never awaited Exception when running tests

* imrpove expiration test

* move cache into utils

* fix issue with pytest_asyncio

s

---------

Co-authored-by: jacksn <jkranawetter05@gmail.com>

lnbits/app.py

@@ -20,7 +20,6 @@ from slowapi import Limiter
 from slowapi.util import get_remote_address
 from starlette.responses import JSONResponse
 
-from lnbits.cache import cache
 from lnbits.core.crud import get_installed_extensions
 from lnbits.core.helpers import migrate_extension_database
 from lnbits.core.services import websocketUpdater
@@ -30,6 +29,7 @@ from lnbits.core.tasks import (  # register_watchdog,; unregister_watchdog,
 )
 from lnbits.settings import settings
 from lnbits.tasks import cancel_all_tasks, create_permanent_task
+from lnbits.utils.cache import cache
 from lnbits.wallets import get_wallet_class, set_wallet_class
 
 from .commands import db_versions, load_disabled_extension_list, migrate_databases
@@ -358,8 +358,6 @@ def register_startup(app: FastAPI):
             if settings.lnbits_admin_ui:
                 initialize_server_logger()
 
-            asyncio.create_task(cache.invalidate_forever())
-
         except Exception as e:
             logger.error(str(e))
             raise ImportError("Failed to run 'startup' event.")
@@ -431,6 +429,7 @@ def register_async_tasks(app):
         create_permanent_task(check_pending_payments)
         create_permanent_task(invoice_listener)
         create_permanent_task(internal_invoice_listener)
+        create_permanent_task(cache.invalidate_forever)
         register_task_listeners()
         register_killswitch()
         # await run_deferred_async() # calle: doesn't do anyting?