add refund and event logic

tests/Unit/Services/Events/EventCategoryServiceTest.php

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+<?php
+
+namespace Tests\Unit\Services\Events;
+
+use App\Services\Events\EventCategoryService;
+use Tests\TestCase;
+
+class EventCategoryServiceTest extends TestCase
+{
+    public function test_categories_returns_list(): void
+    {
+        $categories = EventCategoryService::categories();
+
+        $this->assertContains('workshops', $categories);
+        $this->assertContains('field trips', $categories);
+    }
+}

tests/Unit/Services/Events/EventChargeQueryServiceTest.php

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+<?php
+
+namespace Tests\Unit\Services\Events;
+
+use App\Services\Events\EventChargeQueryService;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\DB;
+use Tests\TestCase;
+
+class EventChargeQueryServiceTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_list_returns_paginated_charges(): void
+    {
+        DB::table('event_charges')->insert([
+            'id' => 1,
+            'event_id' => 1,
+            'parent_id' => 10,
+            'student_id' => 1,
+            'participation' => 'yes',
+            'charged' => 10,
+            'school_year' => '2025-2026',
+            'semester' => 'Fall',
+            'created_at' => now(),
+            'updated_at' => now(),
+        ]);
+
+        $service = new EventChargeQueryService();
+        $result = $service->list(['per_page' => 10, 'page' => 1]);
+
+        $this->assertSame(1, $result['pagination']['total']);
+    }
+}

tests/Unit/Services/Events/EventChargeServiceTest.php

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+<?php
+
+namespace Tests\Unit\Services\Events;
+
+use App\Models\Event;
+use App\Services\Events\EventChargeService;
+use App\Services\Invoices\InvoiceGenerationService;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\DB;
+use Mockery;
+use Tests\TestCase;
+
+class EventChargeServiceTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_seed_charges_creates_event_charges(): void
+    {
+        DB::table('events')->insert([
+            'id' => 1,
+            'event_name' => 'Trip',
+            'event_category' => 'field trips',
+            'amount' => 25,
+            'expiration_date' => '2025-02-01',
+            'semester' => 'Fall',
+            'school_year' => '2025-2026',
+            'created_at' => now(),
+            'updated_at' => now(),
+        ]);
+
+        DB::table('students')->insert([
+            'id' => 1,
+            'parent_id' => 10,
+            'firstname' => 'Kid',
+            'lastname' => 'One',
+        ]);
+
+        DB::table('enrollments')->insert([
+            'id' => 1,
+            'student_id' => 1,
+            'parent_id' => 10,
+            'class_section_id' => 101,
+            'enrollment_status' => 'enrolled',
+            'school_year' => '2025-2026',
+        ]);
+
+        $invoiceService = Mockery::mock(InvoiceGenerationService::class);
+        $invoiceService->shouldReceive('generateInvoice')->andReturn(['ok' => true]);
+
+        $service = new EventChargeService($invoiceService);
+        $event = Event::query()->findOrFail(1);
+        $service->seedChargesForEvent($event, '2025-2026', 'Fall', 25, 1);
+
+        $this->assertDatabaseHas('event_charges', [
+            'event_id' => 1,
+            'student_id' => 1,
+        ]);
+    }
+}

tests/Unit/Services/Events/EventListServiceTest.php

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+<?php
+
+namespace Tests\Unit\Services\Events;
+
+use App\Services\Events\EventListService;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\DB;
+use Tests\TestCase;
+
+class EventListServiceTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_list_filters_active_events(): void
+    {
+        DB::table('events')->insert([
+            [
+                'id' => 1,
+                'event_name' => 'Active',
+                'event_category' => 'workshops',
+                'amount' => 10,
+                'expiration_date' => now()->addDays(2)->toDateString(),
+                'semester' => 'Fall',
+                'school_year' => '2025-2026',
+                'created_at' => now(),
+                'updated_at' => now(),
+            ],
+            [
+                'id' => 2,
+                'event_name' => 'Expired',
+                'event_category' => 'workshops',
+                'amount' => 10,
+                'expiration_date' => now()->subDays(2)->toDateString(),
+                'semester' => 'Fall',
+                'school_year' => '2025-2026',
+                'created_at' => now(),
+                'updated_at' => now(),
+            ],
+        ]);
+
+        $service = new EventListService();
+        $result = $service->list(['active' => true, 'per_page' => 10]);
+
+        $this->assertSame(1, $result['pagination']['total']);
+    }
+}

tests/Unit/Services/Events/EventManagementServiceTest.php

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+<?php
+
+namespace Tests\Unit\Services\Events;
+
+use App\Services\Events\EventChargeService;
+use App\Services\Events\EventManagementService;
+use App\Services\Invoices\InvoiceGenerationService;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Mockery;
+use Tests\TestCase;
+
+class EventManagementServiceTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_update_returns_not_found(): void
+    {
+        $chargeService = Mockery::mock(EventChargeService::class);
+        $invoiceService = Mockery::mock(InvoiceGenerationService::class);
+
+        $service = new EventManagementService($chargeService, $invoiceService);
+        $result = $service->update(999, ['event_name' => 'Missing'], null);
+
+        $this->assertFalse($result['ok']);
+    }
+}

tests/Unit/Services/Events/EventStudentChargeServiceTest.php

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+<?php
+
+namespace Tests\Unit\Services\Events;
+
+use App\Services\Events\EventStudentChargeService;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\DB;
+use Tests\TestCase;
+
+class EventStudentChargeServiceTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_list_students_with_charges(): void
+    {
+        DB::table('students')->insert([
+            'id' => 1,
+            'parent_id' => 10,
+            'firstname' => 'Kid',
+            'lastname' => 'One',
+        ]);
+
+        DB::table('event_charges')->insert([
+            'id' => 1,
+            'event_id' => 1,
+            'parent_id' => 10,
+            'student_id' => 1,
+            'participation' => 'yes',
+            'charged' => 10,
+            'school_year' => '2025-2026',
+            'semester' => 'Fall',
+        ]);
+
+        $service = new EventStudentChargeService();
+        $rows = $service->listStudentsWithCharges(10, '2025-2026', 'Fall');
+
+        $this->assertTrue($rows[0]['charged']);
+    }
+}