diff --git a/.coveragerc b/.coveragerc
index 9feee202..e1862099 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -3,3 +3,4 @@ exclude_lines =
     pragma: no cover
     if TYPE_CHECKING:
     @abstractmethod
+    @overload
diff --git a/Makefile b/Makefile
index 63b117c0..343f64b0 100644
--- a/Makefile
+++ b/Makefile
@@ -84,7 +84,7 @@ reformat:
 # =================================================================================================
 .PHONY: test-run-services
 test-run-services:
-	docker-compose -f tests/docker-compose.yml -p aiogram3-dev up -d
+	@#docker-compose -f tests/docker-compose.yml -p aiogram3-dev up -d
 
 .PHONY: test
 test: test-run-services
diff --git a/aiogram/__init__.py b/aiogram/__init__.py
index 6ed65c76..ba25e5f2 100644
--- a/aiogram/__init__.py
+++ b/aiogram/__init__.py
@@ -2,7 +2,7 @@ from .client import session
 from .client.bot import Bot
 from .dispatcher import filters, handler
 from .dispatcher.dispatcher import Dispatcher
-from .dispatcher.flags.flags import FlagGenerator
+from .dispatcher.flags.flag import FlagGenerator
 from .dispatcher.middlewares.base import BaseMiddleware
 from .dispatcher.router import Router
 from .utils.magic_filter import MagicFilter
diff --git a/aiogram/dispatcher/flags/flags.py b/aiogram/dispatcher/flags/flag.py
similarity index 80%
rename from aiogram/dispatcher/flags/flags.py
rename to aiogram/dispatcher/flags/flag.py
index 8df2d9f1..845b898b 100644
--- a/aiogram/dispatcher/flags/flags.py
+++ b/aiogram/dispatcher/flags/flag.py
@@ -6,19 +6,23 @@ from magic_filter import AttrDict
 from aiogram.dispatcher.flags.getter import extract_flags_from_object
 
 
-@dataclass
+@dataclass(frozen=True)
 class Flag:
     name: str
     value: Any
 
 
-@dataclass
+@dataclass(frozen=True)
 class FlagDecorator:
     flag: Flag
 
-    def with_value(self, value: Any) -> "FlagDecorator":
+    @classmethod
+    def _with_flag(cls, flag: Flag) -> "FlagDecorator":
+        return cls(flag)
+
+    def _with_value(self, value: Any) -> "FlagDecorator":
         new_flag = Flag(self.flag.name, value)
-        return type(self)(new_flag)
+        return self._with_flag(new_flag)
 
     @overload
     def __call__(self, value: Callable[..., Any]) -> Callable[..., Any]:  # type: ignore
@@ -46,7 +50,7 @@ class FlagDecorator:
                 self.flag.name: self.flag.value,
             }
             return cast(Callable[..., Any], value)
-        return self.with_value(AttrDict(kwargs) if value is None else value)
+        return self._with_value(AttrDict(kwargs) if value is None else value)
 
 
 class FlagGenerator:
diff --git a/aiogram/dispatcher/fsm/storage/base.py b/aiogram/dispatcher/fsm/storage/base.py
index 0fd13c28..71d6ff16 100644
--- a/aiogram/dispatcher/fsm/storage/base.py
+++ b/aiogram/dispatcher/fsm/storage/base.py
@@ -104,5 +104,6 @@ class BaseEventIsolation(ABC):
         """
         yield None
 
+    @abstractmethod
     async def close(self) -> None:
         pass
diff --git a/aiogram/dispatcher/fsm/storage/memory.py b/aiogram/dispatcher/fsm/storage/memory.py
index 1b04397b..b65b5d11 100644
--- a/aiogram/dispatcher/fsm/storage/memory.py
+++ b/aiogram/dispatcher/fsm/storage/memory.py
@@ -56,6 +56,9 @@ class DisabledEventIsolation(BaseEventIsolation):
     async def lock(self, bot: Bot, key: StorageKey) -> AsyncGenerator[None, None]:
         yield
 
+    async def close(self) -> None:
+        pass
+
 
 class SimpleEventIsolation(BaseEventIsolation):
     def __init__(self) -> None:
@@ -67,3 +70,6 @@ class SimpleEventIsolation(BaseEventIsolation):
         lock = self._locks[key]
         async with lock:
             yield
+
+    async def close(self) -> None:
+        self._locks.clear()
diff --git a/aiogram/dispatcher/fsm/storage/redis.py b/aiogram/dispatcher/fsm/storage/redis.py
index ce215d8e..c5ea89ef 100644
--- a/aiogram/dispatcher/fsm/storage/redis.py
+++ b/aiogram/dispatcher/fsm/storage/redis.py
@@ -194,15 +194,17 @@ class RedisEventIsolation(BaseEventIsolation):
     def __init__(
         self,
         redis: Redis,
-        key_builder: KeyBuilder,
+        key_builder: Optional[KeyBuilder] = None,
         lock_kwargs: Optional[Dict[str, Any]] = None,
     ) -> None:
+        if key_builder is None:
+            key_builder = DefaultKeyBuilder()
         self.redis = redis
         self.key_builder = key_builder
         self.lock_kwargs = lock_kwargs or {}
 
     @classmethod
-    async def from_redis(
+    def from_url(
         cls,
         url: str,
         connection_kwargs: Optional[Dict[str, Any]] = None,
@@ -223,3 +225,6 @@ class RedisEventIsolation(BaseEventIsolation):
         redis_key = self.key_builder.build(key, "lock")
         async with self.redis.lock(name=redis_key, **self.lock_kwargs):
             yield None
+
+    async def close(self) -> None:
+        pass
diff --git a/tests/conftest.py b/tests/conftest.py
index e57ec632..698ee5cf 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -4,9 +4,13 @@ import pytest
 from _pytest.config import UsageError
 from aioredis.connection import parse_url as parse_redis_url
 
-from aiogram import Bot
-from aiogram.dispatcher.fsm.storage.memory import MemoryStorage
-from aiogram.dispatcher.fsm.storage.redis import RedisStorage
+from aiogram import Bot, Dispatcher
+from aiogram.dispatcher.fsm.storage.memory import (
+    DisabledEventIsolation,
+    MemoryStorage,
+    SimpleEventIsolation,
+)
+from aiogram.dispatcher.fsm.storage.redis import RedisEventIsolation, RedisStorage
 from tests.mocked_bot import MockedBot
 
 DATA_DIR = Path(__file__).parent / "data"
@@ -67,6 +71,42 @@ async def memory_storage():
         await storage.close()
 
 
+@pytest.fixture()
+@pytest.mark.redis
+async def redis_isolation(redis_server):
+    if not redis_server:
+        pytest.skip("Redis is not available here")
+    isolation = RedisEventIsolation.from_url(redis_server)
+    try:
+        await isolation.redis.info()
+    except ConnectionError as e:
+        pytest.skip(str(e))
+    try:
+        yield isolation
+    finally:
+        conn = await isolation.redis
+        await conn.flushdb()
+        await isolation.close()
+
+
+@pytest.fixture()
+async def lock_isolation():
+    isolation = SimpleEventIsolation()
+    try:
+        yield isolation
+    finally:
+        await isolation.close()
+
+
+@pytest.fixture()
+async def disabled_isolation():
+    isolation = DisabledEventIsolation()
+    try:
+        yield isolation
+    finally:
+        await isolation.close()
+
+
 @pytest.fixture()
 def bot():
     bot = MockedBot()
@@ -75,3 +115,13 @@ def bot():
         yield bot
     finally:
         Bot.reset_current(token)
+
+
+@pytest.fixture()
+async def dispatcher():
+    dp = Dispatcher()
+    await dp.emit_startup()
+    try:
+        yield dp
+    finally:
+        await dp.emit_shutdown()
diff --git a/tests/test_dispatcher/test_dispatcher.py b/tests/test_dispatcher/test_dispatcher.py
index 31e437ca..1150f073 100644
--- a/tests/test_dispatcher/test_dispatcher.py
+++ b/tests/test_dispatcher/test_dispatcher.py
@@ -76,20 +76,15 @@ class TestDispatcher:
         assert dp.update.handlers[0].callback == dp._listen_update
         assert dp.update.outer_middlewares
 
-    def test_parent_router(self):
-        dp = Dispatcher()
+    def test_parent_router(self, dispatcher: Dispatcher):
         with pytest.raises(RuntimeError):
-            dp.parent_router = Router()
-        assert dp.parent_router is None
-        dp._parent_router = Router()
-        assert dp.parent_router is None
+            dispatcher.parent_router = Router()
+        assert dispatcher.parent_router is None
+        dispatcher._parent_router = Router()
+        assert dispatcher.parent_router is None
 
-    @pytest.mark.parametrize("isolate_events", (True, False))
-    async def test_feed_update(self, isolate_events):
-        dp = Dispatcher(isolate_events=isolate_events)
-        bot = Bot("42:TEST")
-
-        @dp.message()
+    async def test_feed_update(self, dispatcher: Dispatcher, bot: MockedBot):
+        @dispatcher.message()
         async def my_handler(message: Message, **kwargs):
             assert "bot" in kwargs
             assert isinstance(kwargs["bot"], Bot)
@@ -97,7 +92,7 @@ class TestDispatcher:
             return message.text
 
         results_count = 0
-        result = await dp.feed_update(
+        result = await dispatcher.feed_update(
             bot=bot,
             update=Update(
                 update_id=42,
diff --git a/tests/test_dispatcher/test_flags/__init__.py b/tests/test_dispatcher/test_flags/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/test_dispatcher/test_flags/test_decorator.py b/tests/test_dispatcher/test_flags/test_decorator.py
new file mode 100644
index 00000000..6c4e40df
--- /dev/null
+++ b/tests/test_dispatcher/test_flags/test_decorator.py
@@ -0,0 +1,66 @@
+import pytest
+
+from aiogram.dispatcher.flags.flag import Flag, FlagDecorator, FlagGenerator
+
+
+@pytest.fixture(name="flag")
+def flag_fixture() -> Flag:
+    return Flag("test", True)
+
+
+@pytest.fixture(name="flag_decorator")
+def flag_decorator_fixture(flag: Flag) -> FlagDecorator:
+    return FlagDecorator(flag)
+
+
+@pytest.fixture(name="flag_generator")
+def flag_flag_generator() -> FlagGenerator:
+    return FlagGenerator()
+
+
+class TestFlagDecorator:
+    def test_with_value(self, flag_decorator: FlagDecorator):
+        new_decorator = flag_decorator._with_value(True)
+
+        assert new_decorator is not flag_decorator
+        assert new_decorator.flag is not flag_decorator.flag
+        assert new_decorator.flag
+
+    def test_call_invalid(self, flag_decorator: FlagDecorator):
+        with pytest.raises(ValueError):
+            flag_decorator(True, test=True)
+
+    def test_call_with_function(self, flag_decorator: FlagDecorator):
+        def func():
+            pass
+
+        decorated = flag_decorator(func)
+        assert decorated is func
+        assert hasattr(decorated, "aiogram_flag")
+
+    def test_call_with_arg(self, flag_decorator: FlagDecorator):
+        new_decorator = flag_decorator("hello")
+        assert new_decorator is not flag_decorator
+        assert new_decorator.flag.value == "hello"
+
+    def test_call_with_kwargs(self, flag_decorator: FlagDecorator):
+        new_decorator = flag_decorator(test=True)
+        assert new_decorator is not flag_decorator
+        assert isinstance(new_decorator.flag.value, dict)
+        assert "test" in new_decorator.flag.value
+
+
+class TestFlagGenerator:
+    def test_getattr(self):
+        generator = FlagGenerator()
+        assert isinstance(generator.foo, FlagDecorator)
+        assert isinstance(generator.bar, FlagDecorator)
+
+        assert generator.foo is not generator.foo
+        assert generator.foo is not generator.bar
+
+    def test_failed_getattr(self):
+        generator = FlagGenerator()
+
+        with pytest.raises(AttributeError):
+            generator._something
diff --git a/tests/test_dispatcher/test_flags/test_getter.py b/tests/test_dispatcher/test_flags/test_getter.py
new file mode 100644
index 00000000..afe7891c
--- /dev/null
+++ b/tests/test_dispatcher/test_flags/test_getter.py
@@ -0,0 +1,64 @@
+from unittest.mock import patch
+
+import pytest
+
+from aiogram import F
+from aiogram.dispatcher.event.handler import HandlerObject
+from aiogram.dispatcher.flags.getter import (
+    check_flags,
+    extract_flags,
+    extract_flags_from_object,
+    get_flag,
+)
+
+
+class TestGetters:
+    def test_extract_flags_from_object(self):
+        def func():
+            pass
+
+        assert extract_flags_from_object(func) == {}
+
+        func.aiogram_flag = {"test": True}
+        assert extract_flags_from_object(func) == func.aiogram_flag
+
+    @pytest.mark.parametrize(
+        "obj,result",
+        [
+            [None, {}],
+            [{}, {}],
+            [{"handler": None}, {}],
+            [{"handler": HandlerObject(lambda: True, flags={"test": True})}, {"test": True}],
+        ],
+    )
+    def test_extract_flags(self, obj, result):
+        assert extract_flags(obj) == result
+
+    @pytest.mark.parametrize(
+        "obj,name,default,result",
+        [
+            [None, "test", None, None],
+            [None, "test", 42, 42],
+            [{}, "test", None, None],
+            [{}, "test", 42, 42],
+            [{"handler": None}, "test", None, None],
+            [{"handler": None}, "test", 42, 42],
+            [{"handler": HandlerObject(lambda: True, flags={"test": True})}, "test", None, True],
+            [{"handler": HandlerObject(lambda: True, flags={"test": True})}, "test2", None, None],
+            [{"handler": HandlerObject(lambda: True, flags={"test": True})}, "test2", 42, 42],
+        ],
+    )
+    def test_get_flag(self, obj, name, default, result):
+        assert get_flag(obj, name, default=default) == result
+
+    @pytest.mark.parametrize(
+        "flags,magic,result",
+        [
+            [{}, F.test, None],
+            [{"test": True}, F.test, True],
+            [{"test": True}, F.spam, None],
+        ],
+    )
+    def test_check_flag(self, flags, magic, result):
+        with patch("aiogram.dispatcher.flags.getter.extract_flags", return_value=flags):
+            assert check_flags(object(), magic) == result
diff --git a/tests/test_dispatcher/test_fsm/storage/test_isolation.py b/tests/test_dispatcher/test_fsm/storage/test_isolation.py
new file mode 100644
index 00000000..8b582f45
--- /dev/null
+++ b/tests/test_dispatcher/test_fsm/storage/test_isolation.py
@@ -0,0 +1,30 @@
+import pytest
+
+from aiogram.dispatcher.fsm.storage.base import BaseEventIsolation, StorageKey
+from tests.mocked_bot import MockedBot
+
+pytestmark = pytest.mark.asyncio
+
+
+@pytest.fixture(name="storage_key")
+def create_storate_key(bot: MockedBot):
+    return StorageKey(chat_id=-42, user_id=42, bot_id=bot.id)
+
+
+@pytest.mark.parametrize(
+    "isolation",
+    [
+        pytest.lazy_fixture("redis_isolation"),
+        pytest.lazy_fixture("lock_isolation"),
+        pytest.lazy_fixture("disabled_isolation"),
+    ],
+)
+class TestIsolations:
+    async def test_lock(
+        self,
+        bot: MockedBot,
+        isolation: BaseEventIsolation,
+        storage_key: StorageKey,
+    ):
+        async with isolation.lock(bot=bot, key=storage_key):
+            assert True, "You are kidding me?"
diff --git a/tests/test_dispatcher/test_fsm/storage/test_redis.py b/tests/test_dispatcher/test_fsm/storage/test_redis.py
index 8914dc94..5bf3170e 100644
--- a/tests/test_dispatcher/test_fsm/storage/test_redis.py
+++ b/tests/test_dispatcher/test_fsm/storage/test_redis.py
@@ -1,7 +1,11 @@
 import pytest
 
 from aiogram.dispatcher.fsm.storage.base import DEFAULT_DESTINY, StorageKey
-from aiogram.dispatcher.fsm.storage.redis import DefaultKeyBuilder
+from aiogram.dispatcher.fsm.storage.redis import (
+    DefaultKeyBuilder,
+    RedisEventIsolation,
+    RedisStorage,
+)
 
 pytestmark = pytest.mark.asyncio
 
@@ -43,3 +47,11 @@ class TestRedisDefaultKeyBuilder:
         )
         with pytest.raises(ValueError):
             key_builder.build(key, FIELD)
+
+    def test_create_isolation(self):
+        fake_redis = object()
+        storage = RedisStorage(redis=fake_redis)
+        isolation = storage.create_isolation()
+        assert isinstance(isolation, RedisEventIsolation)
+        assert isolation.redis is fake_redis
+        assert isolation.key_builder is storage.key_builder
diff --git a/tests/test_dispatcher/test_fsm/storage/test_storages.py b/tests/test_dispatcher/test_fsm/storage/test_storages.py
index 428f6d02..803e3059 100644
--- a/tests/test_dispatcher/test_fsm/storage/test_storages.py
+++ b/tests/test_dispatcher/test_fsm/storage/test_storages.py
@@ -16,11 +16,6 @@ def create_storate_key(bot: MockedBot):
     [pytest.lazy_fixture("redis_storage"), pytest.lazy_fixture("memory_storage")],
 )
 class TestStorages:
-    async def test_lock(self, bot: MockedBot, storage: BaseStorage, storage_key: StorageKey):
-        # TODO: ?!?
-        async with storage.lock(bot=bot, key=storage_key):
-            assert True, "You are kidding me?"
-
     async def test_set_state(self, bot: MockedBot, storage: BaseStorage, storage_key: StorageKey):
         assert await storage.get_state(bot=bot, key=storage_key) is None
 
diff --git a/tests/test_dispatcher/test_webhook/test_aiohtt_server.py b/tests/test_dispatcher/test_webhook/test_aiohtt_server.py
index fa9dad9c..7a044715 100644
--- a/tests/test_dispatcher/test_webhook/test_aiohtt_server.py
+++ b/tests/test_dispatcher/test_webhook/test_aiohtt_server.py
@@ -1,4 +1,6 @@
+import asyncio
 import time
+from asyncio import Event
 from dataclasses import dataclass
 from typing import Any, Dict
 
@@ -19,6 +21,12 @@ from aiogram.methods import GetMe, Request
 from aiogram.types import Message, User
 from tests.mocked_bot import MockedBot
 
+try:
+    from asynctest import CoroutineMock, patch
+except ImportError:
+    from unittest.mock import AsyncMock as CoroutineMock  # type: ignore
+    from unittest.mock import patch
+
 
 class TestAiohttpServer:
     def test_setup_application(self):
@@ -74,8 +82,11 @@ class TestSimpleRequestHandler:
         app = Application()
         dp = Dispatcher()
 
+        handler_event = Event()
+
         @dp.message(F.text == "test")
         def handle_message(msg: Message):
+            handler_event.set()
             return msg.answer("PASS")
 
         handler = SimpleRequestHandler(
@@ -97,8 +108,15 @@ class TestSimpleRequestHandler:
         assert not result
 
         handler.handle_in_background = True
-        resp = await self.make_reqest(client=client)
-        assert resp.status == 200
+        with patch(
+            "aiogram.dispatcher.dispatcher.Dispatcher.silent_call_request",
+            new_callable=CoroutineMock,
+        ) as mocked_silent_call_request:
+            handler_event.clear()
+            resp = await self.make_reqest(client=client)
+            assert resp.status == 200
+            await asyncio.wait_for(handler_event.wait(), timeout=1)
+            mocked_silent_call_request.assert_awaited()
         result = await resp.json()
         assert not result
 
diff --git a/tests/test_utils/test_i18n.py b/tests/test_utils/test_i18n.py
index e8581414..31843080 100644
--- a/tests/test_utils/test_i18n.py
+++ b/tests/test_utils/test_i18n.py
@@ -114,6 +114,24 @@ class TestSimpleI18nMiddleware:
         assert middleware not in dp.update.outer_middlewares
         assert middleware in dp.message.outer_middlewares
 
+    async def test_get_unknown_locale(self, i18n: I18n):
+        dp = Dispatcher()
+        middleware = SimpleI18nMiddleware(i18n=i18n)
+        middleware.setup(router=dp)
+
+        locale = await middleware.get_locale(
+            None,
+            {
+                "event_from_user": User(
+                    id=42,
+                    is_bot=False,
+                    first_name="Test",
+                    language_code="unknown",
+                )
+            },
+        )
+        assert locale == i18n.default_locale
+
 
 @pytest.mark.asyncio
 class TestConstI18nMiddleware: