feat(disp): raise RuntimeError when no storage is set

tests: improve coverage

aiogram/dispatcher/dispatcher.py

@@ -17,7 +17,6 @@ from .middlewares.user_context import UserContextMiddleware
 from .router import Router
 from .state.context import CurrentUserContext
 from .storage.base import BaseStorage
-from .storage.dummy import DummyStorage
 
 
 class Dispatcher(Router, Generic[StorageDataT]):
@@ -40,7 +39,11 @@ class Dispatcher(Router, Generic[StorageDataT]):
     @property
     def current_state(self) -> CurrentUserContext[StorageDataT]:
         if self.storage is None:
-            self.storage: DummyStorage = DummyStorage()  # type: ignore
+            raise RuntimeError(
+                "`Dispatcher.current_state` requires storage to be used properly. "
+                "Set the storage first while initialization: "
+                "Dispatcher(storage=<required_storage>, )"
+            )
 
         chat = cast(Optional[Chat], Chat.get_current())
         user = cast(Optional[User], User.get_current())
@@ -233,7 +236,7 @@ class Dispatcher(Router, Generic[StorageDataT]):
         try:
             try:
                 await waiter
-            except CancelledError:  # pragma: nocover
+            except CancelledError:  # pragma: no cover
                 process_updates.remove_done_callback(release_waiter)
                 process_updates.cancel()
                 raise

tests/test_dispatcher/test_dispatcher.py

@@ -11,6 +11,8 @@ from aiogram.api.types import Chat, Message, Update, User
 from aiogram.dispatcher.dispatcher import Dispatcher
 from aiogram.dispatcher.event.bases import NOT_HANDLED
 from aiogram.dispatcher.router import Router
+from aiogram.dispatcher.state.context import CurrentUserContext
+from aiogram.dispatcher.storage.dict import DictStorage
 from tests.mocked_bot import MockedBot
 
 try:
@@ -51,6 +53,22 @@ class TestDispatcher:
         dp._parent_router = Router()
         assert dp.parent_router is None
 
+    def test_init_storage(self):
+        dp = Dispatcher()
+        with pytest.raises(RuntimeError):
+            _ = dp.current_state
+        assert dp.storage is None
+        _storage = DictStorage()
+        dp = Dispatcher(storage=_storage)
+        assert dp.storage == _storage
+
+    @pytest.mark.asyncio
+    async def test_current_state(self):
+        user = User(id=109_112_97, is_bot=False, first_name="mpa")
+        User.set_current(user)
+        dp = Dispatcher(storage=DictStorage())
+        assert isinstance(dp.current_state, CurrentUserContext)
+
     @pytest.mark.asyncio
     async def test_feed_update(self):
         dp = Dispatcher()