Add API methods testing prototype

tests/mocked_bot.py

@@ -0,0 +1,59 @@
+from collections import deque
+from typing import Optional
+
+from aiogram import Bot
+from aiogram.api.client.session.base import BaseSession
+from aiogram.api.methods import TelegramMethod
+from aiogram.api.methods.base import T, Request, Response
+
+
+class MockedSession(BaseSession):
+    def __init__(self):
+        super(MockedSession, self).__init__()
+        self.responses = deque()
+        self.requests = deque()
+
+    def add_result(self, response: Response) -> Response:
+        self.responses.append(response)
+        return response
+
+    def get_request(self) -> Request:
+        return self.requests.pop()
+
+    async def close(self):
+        pass
+
+    async def make_request(self, token: str, method: TelegramMethod[T]) -> T:
+        self.requests.append(method.build_request())
+        response: Response = self.responses.pop()
+        self.raise_for_status(response)
+        return response.result
+
+
+class MockedBot(Bot):
+    def __init__(self):
+        super(MockedBot, self).__init__("TOKEN", session=MockedSession())
+
+    def add_result_for(
+        self,
+        method,
+        ok: bool,
+        result: Optional[T] = None,
+        description: Optional[str] = None,
+        error_code: Optional[int] = None,
+        migrate_to_chat_id: Optional[int] = None,
+        retry_after: Optional[int] = None,
+    ) -> Response[T]:
+        response = Response[method.__returning__](
+            ok=ok,
+            result=result,
+            description=description,
+            error_code=error_code,
+            migrate_to_chat_id=migrate_to_chat_id,
+            retry_after=retry_after,
+        )
+        self.session.add_result(response)
+        return response
+
+    def get_request(self) -> Request:
+        return self.session.get_request()