fix cs and add EntityToIdTransformer

src/Bundle/ChillCalendarBundle/Tests/Entity/CalendarTest.php

@@ -1,12 +1,25 @@
 <?php
 
+/**
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
 namespace Chill\CalendarBundle\Tests\Entity;
 
 use Chill\CalendarBundle\Entity\Calendar;
 use Chill\MainBundle\Entity\User;
 use PHPUnit\Framework\TestCase;
 
-class CalendarTest extends TestCase
+/**
+ * @internal
+ * @coversNothing
+ */
+final class CalendarTest extends TestCase
 {
     public function testAddUser()
     {
@@ -40,5 +53,4 @@ class CalendarTest extends TestCase
         $this->assertCount(0, $calendar->getInvites());
         $this->assertCount(0, $calendar->getUsers());
     }
-
 }