cs: Switch to a stricter way of coding - this might break in a lot of places.

src/Bundle/ChillCalendarBundle/Tests/Controller/CalendarControllerTest.php

@@ -7,6 +7,15 @@
  * the LICENSE file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
+/**
+ * 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.
+ */
+
 namespace Chill\CalendarBundle\Tests\Controller;
 
 use Chill\PersonBundle\Entity\AccompanyingPeriod;
@@ -19,15 +28,15 @@ use function random_int;
  * @internal
  * @coversNothing
  */
-class CalendarControllerTest extends WebTestCase
+final class CalendarControllerTest extends WebTestCase
 {
     /**
      * Setup before each test method (see phpunit doc).
      */
     public function setUp()
     {
-        static::bootKernel();
-        $this->client = static::createClient([], [
+        self::bootKernel();
+        $this->client = self::createClient([], [
             'PHP_AUTH_USER' => 'center a_social',
             'PHP_AUTH_PW' => 'password',
         ]);
@@ -35,8 +44,8 @@ class CalendarControllerTest extends WebTestCase
 
     public function provideAccompanyingPeriod(): iterable
     {
-        static::bootKernel();
-        $em = static::$container->get(EntityManagerInterface::class);
+        self::bootKernel();
+        $em = self::$container->get(EntityManagerInterface::class);
 
         $nb = $em->createQueryBuilder()
             ->from(AccompanyingPeriod::class, 'ac')