MAGETWO-71771: imposible perform full refund for Order Paid with PayPal Payments Standard

- Reuse test fixture for integration test

Author: danielrenaud

dev/tests/integration/testsuite/Magento/Paypal/Model/Api/NvpTest.php

@@ -121,7 +121,7 @@ public function testRequestTotalsAndLineItemsWithFPT()
     /**
      * Test that the refund request to Paypal sends the correct data
      *
-     * @magentoDataFixture Magento/Paypal/_files/order_standard_with_tax_and_invoice.php
+     * @magentoDataFixture Magento/Paypal/_files/order_express_with_tax.php
      */
     public function testCallRefundTransaction()
     {

dev/tests/integration/testsuite/Magento/Paypal/_files/order_express_with_tax.php

@@ -0,0 +1,21 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+require __DIR__ . '/order_express.php';
+
+$subTotal = 121;
+$taxRate = .0825;
+$taxAmount = $subTotal * $taxRate;
+$shippingAmount = 15;
+$totalAmount =  $subTotal + $taxAmount + $shippingAmount;
+
+$order->setSubtotal($subTotal);
+$order->setBaseSubtotal($subTotal);
+$order->setGrandTotal($totalAmount);
+$order->setBaseGrandTotal($totalAmount);
+$order->setTaxAmount($taxAmount);
+
+$order->save();