Fix PSR1.Classes.ClassDeclaration sniffer rule in tests [MAILPOET-1025]

tests/unit/Cron/Workers/KeyCheck/KeyCheckWorkerTest.php

@@ -1,4 +1,5 @@
 <?php
+namespace MailPoet\Test\Cron\Workers\KeyCheck;
 
 use Carbon\Carbon;
 use Codeception\Util\Stub;
@@ -9,7 +10,7 @@ use MailPoet\Services\Bridge;
 require_once('KeyCheckWorkerMockImplementation.php');
 use MailPoet\Cron\Workers\KeyCheck\KeyCheckWorkerMockImplementation as MockKeyCheckWorker;
 
-class KeyCheckWorkerTest extends MailPoetTest {
+class KeyCheckWorkerTest extends \MailPoetTest {
   function _before() {
     $this->worker = new MockKeyCheckWorker();
   }