diff --git a/aiogram/api/client/session/aiohttp.py b/aiogram/api/client/session/aiohttp.py
index 2122d6e3..28ca6db0 100644
--- a/aiogram/api/client/session/aiohttp.py
+++ b/aiogram/api/client/session/aiohttp.py
@@ -62,7 +62,8 @@ class AiohttpSession(BaseSession):
         return self
 
     def __deepcopy__(self: T, memo: Optional[Dict[int, Any]] = None) -> T:
-        if memo is None:
+        if memo is None:  # pragma: no cover
+            # This block was never be called
             memo = {}
 
         cls = self.__class__
diff --git a/tests/test_api/test_client/test_base_bot.py b/tests/test_api/test_client/test_base_bot.py
index 7e8f2a85..22a5a767 100644
--- a/tests/test_api/test_client/test_base_bot.py
+++ b/tests/test_api/test_client/test_base_bot.py
@@ -3,7 +3,6 @@ import copy
 import pytest
 from asynctest import CoroutineMock, patch
 
-from aiogram import Bot
 from aiogram.api.client.base import BaseBot
 from aiogram.api.client.session.aiohttp import AiohttpSession
 from aiogram.api.methods import GetMe
@@ -22,6 +21,7 @@ class TestBaseBot:
     def test_equals(self):
         base_bot = BaseBot("42:TEST")
         assert base_bot == BaseBot("42:TEST")
+        assert base_bot != "42:TEST"
 
     @pytest.mark.asyncio
     async def test_emit(self):
diff --git a/tests/test_dispatcher/test_dispatcher.py b/tests/test_dispatcher/test_dispatcher.py
index 80f2be46..974063b7 100644
--- a/tests/test_dispatcher/test_dispatcher.py
+++ b/tests/test_dispatcher/test_dispatcher.py
@@ -2,11 +2,12 @@ import datetime
 import time
 
 import pytest
+from asynctest import MagicMock, patch
+
 from aiogram import Bot
 from aiogram.api.types import Chat, Message, Update, User
 from aiogram.dispatcher.dispatcher import Dispatcher
 from aiogram.dispatcher.router import Router
-from asynctest import MagicMock, patch
 
 
 class TestDispatcher: