Added numeric check for slug attribut

application/symfony/tests/Unit/Attribut/SlugAttributTest.php

@@ -5,6 +5,7 @@ namespace Tests\Attribut;
 use PHPUnit\Framework\TestCase;
 use App\Attribut\SlugAttributInterface;
 use App\Attribut\SlugAttribut;
+use App\Exception\UnvalidValueException;
 
 /**
  * @author kevinfrantz
@@ -39,4 +40,10 @@ class SlugAttributTest extends TestCase
         $this->assertNull($this->slugAttribut->setSlug(''));
         $this->assertTrue($this->slugAttribut->hasSlug());
     }
+
+    public function testNumericSetException(): void
+    {
+        $this->expectException(UnvalidValueException::class);
+        $this->slugAttribut->setSlug('1234');
+    }
 }