MAGETWO-87333: Broken Mainline Test Magento\Paypal\Controller\ExpressTest::testReturnAction

- Unskip test to validate stability on Jenkins

Author: tjwiebell

dev/tests/integration/testsuite/Magento/Paypal/Controller/ExpressTest.php

@@ -140,12 +140,11 @@ public function testStartActionCustomerToQuote()
 
     /**
      * Test return action with configurable product.
+     *
+     * @magentoDataFixture Magento/Paypal/_files/quote_express_configurable.php
      */
     public function testReturnAction()
     {
-        // Skipped due to MAGETWO-87333
-        //@magentoDataFixture Magento/Paypal/_files/quote_express_configurable.php
-        $this->markTestSkipped('MAGETWO-87333');
         $quote = $this->_objectManager->create(Quote::class);
         $quote->load('test_cart_with_configurable', 'reserved_order_id');