No module named 'aiogram.utils.helper'

[Oldweedkeeper2]

I can't even run the basic example even though version aiogram==3.0.0b7.

Tell me please, what could be the problem?
All code and error is attached below.

@router.message(Command(commands=["start"]))
async def command_handler(message: Message, state: FSMContext) -> None:
await message.answer("Hello, new user!")

import pytest
from aiogram.filters import Command
from aiogram_tests import MockedBot
from aiogram_tests.handler import MessageHandler
from aiogram_tests.types.dataset import MESSAGE

from handlers.users.start import command_handler

@pytest.mark.asyncio
async def test_command_handler():
requester = MockedBot(MessageHandler(command_handler, Command(commands=["start"])))
calls = await requester.query(MESSAGE.as_object(text="/start"))
answer_message = calls.send_message.fetchone().text
assert answer_message == "Hi there! What's your name?"

============================= test session starts =============================
collecting ...
test_start.py:None (test_start.py)
ImportError while importing test module 'C:\Users\inver\PycharmProjects\aiogram3-bot-template\tests\test_start.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
..\venv\Lib\site-packages_pytest\python.py:617: in importtestmodule
mod = import_path(self.path, mode=importmode, root=self.config.rootpath)
..\venv\Lib\site-packages_pytest\pathlib.py:565: in import_path
importlib.import_module(module_name)
......\AppData\Local\Programs\Python\Python311\Lib\importlib_init.py:126: in import_module
return _bootstrap._gcd_import(name[level:], package, level)
:1204: in _gcd_import
???
:1176: in _find_and_load
???
:1147: in _find_and_load_unlocked
???
:690: in load_unlocked
???
..\venv\Lib\site-packages_pytest\assertion\rewrite.py:178: in exec_module
exec(co, module.dict)
test_start.py:28: in
from aiogram_tests import MockedBot
..\venv\Lib\site-packages\aiogram_tests_init.py:1: in
from .requester import MockedBot
..\venv\Lib\site-packages\aiogram_tests\requester.py:1: in
from aiogram.utils.helper import Helper
E ModuleNotFoundError: No module named 'aiogram.utils.helper'
collected 0 items / 1 error

!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!
============================== 1 error in 1.04s ===============================

[kmmbvnr]

Looks it has been fixed in the git version ffb97eb