Delete old telegram bot messages from group chat and user commands

delete.py

#!/usr/bin/python

# Prerequisities
# pip install pyrogram tgcrypto

from datetime import datetime

from pyrogram import Client

# Configure here
api_id = 
api_hash = ''
delete_older_than_days = 1
chat_id = ''

app = Client("my_account", api_id, api_hash)


async def main():
    now = datetime.now()
    i = 0
    async with app:
        async for message in app.get_chat_history(chat_id):
            message_age = (now - message.date).days
            if not message.service and message_age >= delete_older_than_days:
                if message.from_user.is_bot or (message.text and message.text.startswith('/')):
                    i += 1
                    await message.delete()
    print(f'Deleted {i}')

app.run(main())

WHERE ARE THE TESTS???111??!!!