public void TestGetAllInvoicesForInvoiceItem()
        {
            string      filepath           = "dummy_invoice_item.json";
            string      url                = string.Format("{0}/{1}", invoiceItemURL, INVOICEITEMID);
            Client      client             = new Client(ACCESSID, SECRETKEY, Helper.GetMockRequestFactory(filepath, url));
            InvoiceItem invoiceitem        = client.InvoiceItem.Retrieve(INVOICEITEMID);
            string      expectedJsonString = Helper.GetJsonString(filepath);

            Helper.AssertEntity(invoiceitem, expectedJsonString);

            string filepath2    = "dummy_invoice_collection.json";
            string invoices_url = string.Format("{0}/invoices", url);

            client = new Client(ACCESSID, SECRETKEY, Helper.GetMockRequestFactory(filepath2, invoices_url));
            var result = invoiceitem.Invoices();

            expectedJsonString = Helper.GetJsonString(filepath2);
            Helper.AssertEntity(result, expectedJsonString);
        }