add test batches

app/Http/Controllers/Api/Finance/PaymentEventChargesController.php

@@ -69,6 +69,9 @@ class PaymentEventChargesController extends BaseApiController
         return response()->json(['ok' => true, 'students' => $students]);
     }
 
+    /**
+     * @return int|JsonResponse
+     */
     private function authenticatedUserIdOrUnauthorized(): int|JsonResponse
     {
         $userId = (int) (auth()->id() ?? 0);