How to use the steampy.models.GameOptions.CS function in steampy

def test_get_price(self):
        client = SteamClient(self.credentials.api_key)
        item = 'M4A1-S | Cyrex (Factory New)'
        prices = client.market.fetch_price(item, GameOptions.CS)
        self.assertTrue(prices['success'])

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_get_my_inventory(self):
        client = SteamClient(self.credentials.api_key)
        client.login(self.credentials.login, self.credentials.password, self.steam_guard_file)
        inventory = client.get_my_inventory(GameOptions.CS)
        self.assertIsNotNone(inventory)

def test_create_and_cancel_buy_order(self):
        client = SteamClient(self.credentials.api_key)
        client.login(self.credentials.login, self.credentials.password, self.steam_guard_file)
        # PUT THE REAL CURRENCY OF YOUR STEAM WALLET, OTHER CURRENCIES WILL NOT WORK
        response = client.market.create_buy_order("AK-47 | Redline (Field-Tested)", "10.34", 2, GameOptions.CS,
                                                  Currency.EURO)
        buy_order_id = response["buy_orderid"]
        self.assertTrue(response["success"] == 1)
        self.assertIsNotNone(buy_order_id)
        response = client.market.cancel_buy_order(buy_order_id)
        self.assertTrue(response["success"])