feat: add SendPaymentFailedReminderJob with grace guard

tests/Feature/Payments/SendPaymentFailedReminderJobTest.php

@@ -0,0 +1,54 @@
+<?php
+
+use App\Jobs\SendPaymentFailedReminderJob;
+use App\Mail\PaymentFailedDay3Reminder;
+use App\Mail\PaymentFailedDay5Reminder;
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Mail;
+
+uses(RefreshDatabase::class);
+
+it('sends the day-3 mailable when grace_period_until is still set', function (): void {
+    Mail::fake();
+    $user = User::factory()->create(['grace_period_until' => now()->addDays(2)]);
+
+    (new SendPaymentFailedReminderJob($user->id, 3))->handle();
+
+    Mail::assertSent(PaymentFailedDay3Reminder::class, fn ($mail) => $mail->hasTo($user->email));
+});
+
+it('sends the day-5 mailable when grace_period_until is still set', function (): void {
+    Mail::fake();
+    $user = User::factory()->create(['grace_period_until' => now()->addDay()]);
+
+    (new SendPaymentFailedReminderJob($user->id, 5))->handle();
+
+    Mail::assertSent(PaymentFailedDay5Reminder::class, fn ($mail) => $mail->hasTo($user->email));
+});
+
+it('silently skips the day-3 mailable when grace has been cleared', function (): void {
+    Mail::fake();
+    $user = User::factory()->create(['grace_period_until' => null]);
+
+    (new SendPaymentFailedReminderJob($user->id, 3))->handle();
+
+    Mail::assertNothingSent();
+});
+
+it('silently skips the day-5 mailable when grace has been cleared', function (): void {
+    Mail::fake();
+    $user = User::factory()->create(['grace_period_until' => null]);
+
+    (new SendPaymentFailedReminderJob($user->id, 5))->handle();
+
+    Mail::assertNothingSent();
+});
+
+it('silently skips when the user no longer exists', function (): void {
+    Mail::fake();
+
+    (new SendPaymentFailedReminderJob(999999, 3))->handle();
+
+    Mail::assertNothingSent();
+});