add test batches

app/Services/Invoices/InvoiceTuitionService.php

@@ -13,7 +13,8 @@ class InvoiceTuitionService
         private float $secondStudentFee,
         private float $youthFee,
         private string $timezone
-    ) {}
+    ) {
+    }
 
     public function calculateTuitionFee(array $registeredKids, array $withdrawnKids, ?string $refundDeadline): float
     {
@@ -60,7 +61,7 @@ class InvoiceTuitionService
 
     private function isRefundAllowed(?string $refundDeadline): bool
     {
-        if (! $refundDeadline) {
+        if (!$refundDeadline) {
             return true;
         }
 
@@ -68,7 +69,6 @@ class InvoiceTuitionService
             $tz = new \DateTimeZone($this->timezone);
             $today = new \DateTimeImmutable('today', $tz);
             $deadline = new \DateTimeImmutable($refundDeadline, $tz);
-
             return $today <= $deadline;
         } catch (\Throwable $e) {
             return true;