completed story 1.1 with QA tests and fixes

tests/Unit/Enums/PaymentStatusTest.php

@@ -0,0 +1,19 @@
+<?php
+
+use App\Enums\PaymentStatus;
+
+test('payment status has correct cases', function () {
+    expect(PaymentStatus::cases())->toHaveCount(3);
+});
+
+test('payment status pending has correct value', function () {
+    expect(PaymentStatus::Pending->value)->toBe('pending');
+});
+
+test('payment status received has correct value', function () {
+    expect(PaymentStatus::Received->value)->toBe('received');
+});
+
+test('payment status not applicable has correct value', function () {
+    expect(PaymentStatus::NotApplicable->value)->toBe('na');
+});