diff --git a/tests/mocked_bot.py b/tests/mocked_bot.py
index 680e4883..af86098f 100644
--- a/tests/mocked_bot.py
+++ b/tests/mocked_bot.py
@@ -35,7 +35,7 @@ class MockedSession(BaseSession):
         self.requests.append(method)
         response: Response[TelegramType] = self.responses.pop()
         self.check_response(
-            method=method, status_code=response.error_code, content=response.json()
+            bot=bot, method=method, status_code=response.error_code, content=response.json()
         )
         return response.result  # type: ignore
 
diff --git a/tests/test_api/test_client/test_context_controller.py b/tests/test_api/test_client/test_context_controller.py
new file mode 100644
index 00000000..25643b27
--- /dev/null
+++ b/tests/test_api/test_client/test_context_controller.py
@@ -0,0 +1,36 @@
+from aiogram.client.context_controller import BotContextController
+from tests.mocked_bot import MockedBot
+
+
+class MyModel(BotContextController):
+    id: int
+
+
+class TestBotContextController:
+    def test_via_model_validate(self, bot: MockedBot):
+        my_model = MyModel.model_validate({"id": 1}, context={"bot": bot})
+        assert my_model.id == 1
+        assert my_model._bot == bot
+
+    def test_via_model_validate_none(self):
+        my_model = MyModel.model_validate({"id": 1}, context={})
+        assert my_model.id == 1
+        assert my_model._bot is None
+
+    def test_as(self, bot: MockedBot):
+        my_model = MyModel(id=1).as_(bot)
+        assert my_model.id == 1
+        assert my_model._bot == bot
+
+    def test_as_none(self):
+        my_model = MyModel(id=1).as_(None)
+        assert my_model.id == 1
+        assert my_model._bot is None
+
+    def test_replacement(self, bot: MockedBot):
+        my_model = MyModel(id=1).as_(bot)
+        assert my_model.id == 1
+        assert my_model._bot == bot
+        my_model = my_model.as_(None)
+        assert my_model.id == 1
+        assert my_model._bot is None
diff --git a/tests/test_api/test_client/test_session/test_base_session.py b/tests/test_api/test_client/test_session/test_base_session.py
index 5d1ebef1..3793f22a 100644
--- a/tests/test_api/test_client/test_session/test_base_session.py
+++ b/tests/test_api/test_client/test_session/test_base_session.py
@@ -170,9 +170,11 @@ class TestBaseSession:
     )
     def test_check_response(self, status_code, content, error):
         session = CustomSession()
+        bot = MockedBot()
         method = DeleteMessage(chat_id=42, message_id=42)
         if error is None:
             session.check_response(
+                bot=bot,
                 method=method,
                 status_code=status_code,
                 content=content,
@@ -180,6 +182,7 @@ class TestBaseSession:
         else:
             with pytest.raises(error) as exc_info:
                 session.check_response(
+                    bot=bot,
                     method=method,
                     status_code=status_code,
                     content=content,
@@ -191,10 +194,12 @@ class TestBaseSession:
 
     def test_check_response_json_decode_error(self):
         session = CustomSession()
+        bot = MockedBot()
         method = DeleteMessage(chat_id=42, message_id=42)
 
         with pytest.raises(ClientDecodeError, match="JSONDecodeError"):
             session.check_response(
+                bot=bot,
                 method=method,
                 status_code=200,
                 content="is not a JSON object",
@@ -202,10 +207,12 @@ class TestBaseSession:
 
     def test_check_response_validation_error(self):
         session = CustomSession()
+        bot = MockedBot()
         method = DeleteMessage(chat_id=42, message_id=42)
 
         with pytest.raises(ClientDecodeError, match="ValidationError"):
             session.check_response(
+                bot=bot,
                 method=method,
                 status_code=200,
                 content='{"ok": "test"}',
diff --git a/tests/test_api/test_methods/test_base.py b/tests/test_api/test_methods/test_base.py
index f2351d40..9626c9b7 100644
--- a/tests/test_api/test_methods/test_base.py
+++ b/tests/test_api/test_methods/test_base.py
@@ -22,6 +22,14 @@ class TestTelegramMethodRemoveUnset:
 
 
 class TestTelegramMethodCall:
+    async def test_async_emit_unsuccessful(self, bot: MockedBot):
+        with pytest.raises(
+            RuntimeError,
+            match="This method is not mounted to a any bot instance.+",
+        ):
+            await GetMe()
+
     async def test_async_emit(self, bot: MockedBot):
         bot.add_result_for(GetMe, ok=True, result=User(id=42, is_bot=True, first_name="Test"))
-        assert isinstance(await GetMe(), User)
+        method = GetMe().as_(bot)
+        assert isinstance(await method, User)