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tests/test_dispatcher/test_handler/test_chat_member.py

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+import datetime
+from typing import Any
+
+import pytest
+
+from aiogram.dispatcher.handler.chat_member import ChatMemberHandler
+from aiogram.types import Chat, ChatMember, ChatMemberUpdated, User
+
+
+class TestChatMemberUpdated:
+    @pytest.mark.asyncio
+    async def test_attributes_aliases(self):
+        event = ChatMemberUpdated(
+            chat=Chat(id=42, type="private"),
+            from_user=User(id=42, is_bot=False, first_name="Test"),
+            date=datetime.datetime.now(),
+            old_chat_member=ChatMember(
+                user=User(id=42, is_bot=False, first_name="Test"), status="restricted"
+            ),
+            new_chat_member=ChatMember(
+                user=User(id=42, is_bot=False, first_name="Test"), status="restricted"
+            ),
+        )
+
+        class MyHandler(ChatMemberHandler):
+            async def handle(self) -> Any:
+                assert self.event == event
+                assert self.from_user == self.event.from_user
+
+                return True
+
+        assert await MyHandler(event)