Add class NodaValidationHelper, for now for validating actor

descriptions

tests/NodaUncertaintyHelperTest.php

@@ -1,15 +1,15 @@
 <?PHP
 /**
- * This script contains tests for the home page.
+ * This script contains tests for the uncertainty helper.
  *
  * @author Joshua Ramon Enslin <joshua@museum-digital.de>
  */
 declare(strict_types = 1);
 use PHPUnit\Framework\TestCase;
-require __DIR__ . "/../src/NodaUncertaintyHelper.php";
+require_once __DIR__ . "/../src/NodaUncertaintyHelper.php";
 
 /**
- * Tests for home page.
+ * This script contains tests for the uncertainty helper.
  */
 final class NodaUncertaintyHelperTest extends TestCase {
     /**