MAGETWO-97196: Automate with Integration test Verify Email functionality for order

Author: ameysar

dev/tests/integration/testsuite/Magento/Sales/Controller/Adminhtml/Order/Invoice/SaveTest.php

@@ -1,10 +1,10 @@
 <?php
-declare(strict_types=1);
-
 /**
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Sales\Controller\Adminhtml\Order\Invoice;
 
 use PHPUnit\Framework\Constraint\StringContains;

dev/tests/integration/testsuite/Magento/Sales/Model/Order/CreateTest.php

@@ -1,10 +1,9 @@
 <?php
-declare(strict_types=1);
-
 /**
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
 
 namespace Magento\Sales\Model\Order;
 

dev/tests/integration/testsuite/Magento/Sales/_files/guest_quote_with_addresses.php

@@ -10,9 +10,10 @@
 \Magento\TestFramework\Helper\Bootstrap::getInstance()->loadArea('frontend');
 
 $objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();
+/** @var \Magento\Catalog\Model\Product $product */
 $product = $objectManager->create(\Magento\Catalog\Model\Product::class);
 $product->setTypeId('simple')
-    ->setAttributeSetId(4)
+    ->setAttributeSetId($product->getDefaultAttributeSetId())
     ->setName('Simple Product')
     ->setSku('simple-product-guest-quote')
     ->setPrice(10)