adding DebugBundle and var-dumper requirement

app/config/bundles.php

@@ -10,4 +10,5 @@ return [
     Doctrine\Bundle\MigrationsBundle\DoctrineMigrationsBundle::class => ['all' => true],
     Symfony\Bundle\MakerBundle\MakerBundle::class => ['dev' => true],
     Symfony\WebpackEncoreBundle\WebpackEncoreBundle::class => ['all' => true],
+    Symfony\Bundle\DebugBundle\DebugBundle::class => ['dev' => true, 'test' => true],
 ];