public void PerformPurchase(BillingInformation billingInfo, ShippingInformation shippingInfo)
{
////shoppingCartPage.ChangeQuantity(1);
shoppingCartPage.Checkout.Click();
shoppingCartPage.AssertCheckoutButtonIsEnabled();
shoppingCartPage.AssertCheckoutButtonIsEnabled();
billingInformationPage.Asserter.AssertCityLabel();
billingInformationPage.Asserter.AssertFirstNameLabel();
billingInformationPage.Asserter.AssertLastNameLabel();
billingInformationPage.FillBillingInformation(billingInfo.FirstName, billingInfo.LastName, billingInfo.City);
billingInformationPage.FillShippingInformation(shippingInfo.FirstName, shippingInfo.LastName, shippingInfo.City);
billingInformationPage.Map.ProceedToPayment.Click();
}