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

src/Bundle/ChillPersonBundle/Tests/Serializer/Normalizer/HouseholdNormalizerTest.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\PersonBundle\Tests\Serializer\Normalizer;
 
 use Chill\PersonBundle\Entity\Household\Household;
@@ -21,7 +30,7 @@ use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
  * @internal
  * @coversNothing
  */
-class HouseholdNormalizerTest extends KernelTestCase
+final class HouseholdNormalizerTest extends KernelTestCase
 {
     private ?NormalizerInterface $normalizer;