coding standards

src/Form/FirebasePhpSendTestMessageForm.php

@@ -94,9 +94,9 @@ final class FirebasePhpSendTestMessageForm extends FormBase {
         $form_state->getValue('title'),
         $form_state->getValue('message'),
         $form_state->getValue('device_token'),
-        null,
-        null,
-        null,
+        NULL,
+        NULL,
+        NULL,
         intval($form_state->getValue('badge_count')),
       );
       $this->messenger()->addStatus($this->t('The test message has been sent.'));