How to use the steampy.models.Asset function in steampy

def test_make_offer(self):
        client = SteamClient(self.credentials.api_key)
        client.login(self.credentials.login, self.credentials.password, self.steam_guard_file)
        partner_id = ''
        game = GameOptions.CS
        my_items = client.get_my_inventory(game)
        partner_items = client.get_partner_inventory(partner_id, game)
        my_first_item = next(iter(my_items.values()))
        partner_first_item = next(iter(partner_items.values()))
        my_asset = Asset(my_first_item['id'], game)
        partner_asset = Asset(partner_first_item['id'], game)
        response = client.make_offer([my_asset], [partner_asset], partner_id, 'TESTOWA OFERTA')
        self.assertIsNotNone(response)
        self.assertIn('tradeofferid', response.keys())

def test_make_offer(self):
        client = SteamClient(self.credentials.api_key)
        client.login(self.credentials.login, self.credentials.password, self.steam_guard_file)
        partner_id = ''
        game = GameOptions.CS
        my_items = client.get_my_inventory(game)
        partner_items = client.get_partner_inventory(partner_id, game)
        my_first_item = next(iter(my_items.values()))
        partner_first_item = next(iter(partner_items.values()))
        my_asset = Asset(my_first_item['id'], game)
        partner_asset = Asset(partner_first_item['id'], game)
        response = client.make_offer([my_asset], [partner_asset], partner_id, 'TESTOWA OFERTA')
        self.assertIsNotNone(response)
        self.assertIn('tradeofferid', response.keys())

def test_send_offer_without_sessionid_cookie(self):
        client = SteamClient(self.credentials.api_key)
        client.login(self.credentials.login, self.credentials.password, self.steam_guard_file)
        client._session.cookies.set('sessionid', None, domain="steamcommunity.com")
        cookies = client._session.cookies.get_dict('steamcommunity.com')
        self.assertFalse('sessionid' in cookies)
        game = GameOptions.TF2
        asset_id = ''
        my_asset = Asset(asset_id, game)
        trade_offer_url = ''
        make_offer = lambda: client.make_offer_with_url([my_asset], [], trade_offer_url, "TEST")
        self.assertRaises(AttributeError, make_offer)

def test_make_offer_url(self):
        partner_account_id = '32384925'
        partner_token = '7vqRtBpC'
        sample_trade_url = 'https://steamcommunity.com/tradeoffer/new/?partner=' + partner_account_id + '&token=' + partner_token
        client = SteamClient(self.credentials.api_key)
        client.login(self.credentials.login, self.credentials.password, self.steam_guard_file)
        client._session.request('HEAD', 'http://steamcommunity.com')
        partner_steam_id = account_id_to_steam_id(partner_account_id)
        game = GameOptions.CS
        my_items = client.get_my_inventory(game, merge=False)['rgInventory']
        partner_items = client.get_partner_inventory(partner_steam_id, game, merge=False)['rgInventory']
        my_first_item = next(iter(my_items.values()))
        partner_first_item = next(iter(partner_items.values()))
        my_asset = Asset(my_first_item['id'], game)
        partner_asset = Asset(partner_first_item['id'], game)
        response = client.make_offer_with_url([my_asset], [partner_asset], sample_trade_url, 'TESTOWA OFERTA')
        self.assertIsNotNone(response)
        self.assertIn('tradeofferid', response.keys())

def test_make_offer_url(self):
        partner_account_id = '32384925'
        partner_token = '7vqRtBpC'
        sample_trade_url = 'https://steamcommunity.com/tradeoffer/new/?partner=' + partner_account_id + '&token=' + partner_token
        client = SteamClient(self.credentials.api_key)
        client.login(self.credentials.login, self.credentials.password, self.steam_guard_file)
        client._session.request('HEAD', 'http://steamcommunity.com')
        partner_steam_id = account_id_to_steam_id(partner_account_id)
        game = GameOptions.CS
        my_items = client.get_my_inventory(game, merge=False)['rgInventory']
        partner_items = client.get_partner_inventory(partner_steam_id, game, merge=False)['rgInventory']
        my_first_item = next(iter(my_items.values()))
        partner_first_item = next(iter(partner_items.values()))
        my_asset = Asset(my_first_item['id'], game)
        partner_asset = Asset(partner_first_item['id'], game)
        response = client.make_offer_with_url([my_asset], [partner_asset], sample_trade_url, 'TESTOWA OFERTA')
        self.assertIsNotNone(response)
        self.assertIn('tradeofferid', response.keys())