public void CalculateMemberTotal_InvoicePrice_Null() { //arrange var invoicePriceProvider = new USInvoicePriceProvider(new USInvoiceShippingDetails(new ShippingProvider_US())); //act var response = invoicePriceProvider.CalculateMemberTotal(new InvoiceModel(), "STAFF", "en-US", "US"); //assert Assert.IsNotNull(response); }