Add getting user from chat_boost (#1474)

* Add getting user from `chat_boost`

* Update import

* Add changelog

* Add test for `resolve_event_context`

* Lint changes

* Parametrize test

tests/test_dispatcher/test_middlewares/test_user_context.py

@@ -1,4 +1,5 @@
 from unittest.mock import patch
+from datetime import datetime
 
 import pytest
 
@@ -6,7 +7,16 @@ from aiogram.dispatcher.middlewares.user_context import (
     EventContext,
     UserContextMiddleware,
 )
-from aiogram.types import Chat, Update, User
+from aiogram.types import (
+    Chat,
+    Update,
+    User,
+    ChatBoostUpdated,
+    ChatBoost,
+    ChatBoostSourcePremium,
+    ChatBoostSourceGiftCode,
+    ChatBoostSourceGiveaway,
+)
 
 
 async def next_handler(*args, **kwargs):
@@ -41,3 +51,38 @@ class TestUserContextMiddleware:
         assert data["event_chat"] is chat
         assert data["event_from_user"] is user
         assert data["event_thread_id"] == thread_id
+
+    @pytest.mark.parametrize(
+        "source, expected_user",
+        [
+            (
+                ChatBoostSourcePremium(user=User(id=2, first_name="Test", is_bot=False)),
+                User(id=2, first_name="Test", is_bot=False),
+            ),
+            (ChatBoostSourceGiftCode(user=User(id=2, first_name="Test", is_bot=False)), None),
+            (
+                ChatBoostSourceGiveaway(
+                    giveaway_message_id=1, user=User(id=2, first_name="Test", is_bot=False)
+                ),
+                None,
+            ),
+        ],
+    )
+    async def test_resolve_event_context(self, source, expected_user):
+        middleware = UserContextMiddleware()
+        data = {}
+
+        chat = Chat(id=1, type="private", title="Test")
+        add_date = datetime.now()
+        expiration_date = datetime.now()
+
+        boost = ChatBoost(
+            boost_id="Test", add_date=add_date, expiration_date=expiration_date, source=source
+        )
+        update = Update(update_id=42, chat_boost=ChatBoostUpdated(chat=chat, boost=boost))
+
+        await middleware(next_handler, update, data)
+
+        event_context = data["event_context"]
+        assert isinstance(event_context, EventContext)
+        assert event_context.user == expected_user