Started adding HookHelper and tests but the tests aren't working

modules/opencase_cases/src/Helper/HookHelper.php

@@ -0,0 +1,9 @@
+<?php
+
+namespace Drupal\opencase_cases\Helper;
+
+class HookHelper {
+    public static function onCaseFeeUpdate(\Drupal\opencase_cases\Entity\OCCaseFee $caseFee) {
+        
+    }
+}