[Backport] MAGETWO-91411: Delete action in grid could be sent multiple times.

Fixed integration tests.

Author: Maksym Novik

dev/tests/integration/testsuite/Magento/Customer/Controller/Adminhtml/Index/MassDeleteTest.php

@@ -8,10 +8,10 @@
 use Magento\Customer\Api\CustomerRepositoryInterface;
 use Magento\Customer\Api\Data\CustomerInterface;
 use Magento\Framework\Exception\LocalizedException;
-use PHPUnit\Framework\Constraint\Constraint;
 use Magento\Framework\Message\MessageInterface;
 use Magento\TestFramework\Helper\Bootstrap;
 use Magento\TestFramework\TestCase\AbstractBackendController;
+use PHPUnit_Framework_Constraint;
 
 /**
  * @magentoAppArea adminhtml
@@ -40,13 +40,13 @@ protected function setUp()
      * Validates failure attempts to delete customers from grid.
      *
      * @param array|null $ids
-     * @param Constraint $constraint
+     * @param \PHPUnit_Framework_Constraint $constraint
      * @param string|null $messageType
      * @magentoDataFixture Magento/Customer/_files/five_repository_customers.php
      * @magentoDbIsolation disabled
      * @dataProvider failedRequestDataProvider
      */
-    public function testFailedMassDeleteAction($ids, Constraint $constraint, $messageType)
+    public function testFailedMassDeleteAction($ids, PHPUnit_Framework_Constraint $constraint, $messageType)
     {
         $this->massDeleteAssertions($ids, $constraint, $messageType);
     }
@@ -55,13 +55,13 @@ public function testFailedMassDeleteAction($ids, Constraint $constraint, $messag
      * Validates success attempt to delete customer from grid.
      *
      * @param array $emails
-     * @param Constraint $constraint
+     * @param PHPUnit_Framework_Constraint $constraint
      * @param string $messageType
      * @magentoDataFixture Magento/Customer/_files/five_repository_customers.php
      * @magentoDbIsolation disabled
      * @dataProvider successRequestDataProvider
      */
-    public function testSuccessMassDeleteAction(array $emails, Constraint $constraint, string $messageType)
+    public function testSuccessMassDeleteAction(array $emails, PHPUnit_Framework_Constraint $constraint, $messageType)
     {
         try {
             $ids = [];
@@ -85,10 +85,10 @@ public function testSuccessMassDeleteAction(array $emails, Constraint $constrain
      * Performs required request and assertions.
      *
      * @param array|null $ids
-     * @param Constraint $constraint
+     * @param PHPUnit_Framework_Constraint $constraint
      * @param string|null $messageType
      */
-    private function massDeleteAssertions($ids, Constraint $constraint, $messageType)
+    private function massDeleteAssertions($ids, PHPUnit_Framework_Constraint $constraint, $messageType)
     {
         $requestData = [
             'selected' => $ids,

dev/tests/integration/testsuite/Magento/Customer/_files/five_repository_customers.php

@@ -2,7 +2,7 @@
 /**
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
-
+*/
 use Magento\Customer\Api\CustomerRepositoryInterface;
 use Magento\Customer\Api\Data\CustomerInterface;
 use Magento\Customer\Api\Data\CustomerInterfaceFactory;
@@ -12,9 +12,9 @@
 use Magento\Framework\Indexer\IndexerRegistry;
 use Magento\TestFramework\Helper\Bootstrap;
 
+/** @var CustomerRepositoryInterface $customerRepository */
 $objectManager = Bootstrap::getObjectManager();
 
-/** @var CustomerRepositoryInterface $customerRepository */
 $customerRepository = $objectManager->create(CustomerRepositoryInterface::class);
 /** @var CustomerInterfaceFactory $customerFactory */
 $customerFactory = $objectManager->get(CustomerInterfaceFactory::class);