MAGETWO-66793: [Backport] Merchant can't unsubscribe Customer from Newsletter in Admin

- Update unit and integration tests;

Author: adifucan

app/code/Magento/Customer/Controller/Adminhtml/Index/Save.php

@@ -13,6 +13,9 @@
 use Magento\Customer\Model\Metadata\Form;
 use Magento\Framework\Exception\LocalizedException;
 
+/**
+ * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
+ */
 class Save extends \Magento\Customer\Controller\Adminhtml\Index
 {
     /**

app/code/Magento/Newsletter/Test/Unit/Model/SubscriberTest.php

@@ -5,6 +5,9 @@
  */
 namespace Magento\Newsletter\Test\Unit\Model;
 
+/**
+ * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
+ */
 class SubscriberTest extends \PHPUnit_Framework_TestCase
 {
     /**

dev/tests/integration/testsuite/Magento/Customer/Controller/Adminhtml/IndexTest.php

@@ -347,7 +347,7 @@ public function testSaveActionExistingCustomerUnsubscribeNewsletter()
                 'firstname' => 'test firstname',
                 'lastname' => 'test lastname',
             ],
-            'subscription' => 'false'
+            'subscription' => '0'
         ];
         $this->getRequest()->setPostValue($post);
         $this->getRequest()->setParam('id', 1);