Add unit and feature tests for ticket processing and article management

- Implement Fake repositories and services for testing purposes.
- Create tests for Article API including creation, validation, and listing.
- Develop ProcessTicketJobFlowTest to validate ticket processing logic.
- Add QuickReplyAdminTest for creating and updating quick replies.
- Implement TicketAndArticleModelTest to ensure proper cascading deletes and credential encryption.
- Create TicketIngestionTest for ticket creation and job dispatching.
- Add TicketShowPageTest to verify rendering of quick replies and tool calls.
- Implement unit tests for ClassifierPromptBuilder, EmbeddingService, LlmJsonDecoder, QuickReplyResolver, SupportReplyService, TicketResultPayloadBuilder, TicketToolCallService, and ToolCallRequestValidator.

tests/Unit/SupportReplyServiceTest.php

@@ -0,0 +1,68 @@
+<?php
+
+namespace Tests\Unit;
+
+use App\Models\Article;
+use App\Models\Ticket;
+use App\Services\AppSettingsService;
+use App\Services\Llm\LlmClientInterface;
+use App\Services\SupportReplyService;
+use App\Services\TicketProcessingLoggerService;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\Fakes\FakeLlmClient;
+use Tests\Fakes\FakeTicketProcessingLoggerService;
+use Tests\TestCase;
+
+class SupportReplyServiceTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_it_returns_llm_response_when_available(): void
+    {
+        $llm = new FakeLlmClient;
+        $llm->responses = ['1. Doe X'];
+
+        $service = new SupportReplyService(
+            $this->fakeSettings(),
+            $llm,
+            new FakeTicketProcessingLoggerService
+        );
+
+        $ticket = Ticket::query()->create(['message' => 'vraag', 'normalized_message' => 'vraag']);
+        $article = Article::query()->create(['title' => 'DNS', 'content' => 'steps']);
+
+        $reply = $service->build($ticket, $article, 'relevant');
+
+        $this->assertSame('1. Doe X', $reply);
+        $this->assertStringContainsString('Gebruikersvraag (genormaliseerd): vraag', $llm->generatedPrompts[0]['prompt']);
+    }
+
+    public function test_it_falls_back_when_llm_returns_empty(): void
+    {
+        $llm = new FakeLlmClient;
+        $llm->responses = [''];
+
+        $service = new SupportReplyService(
+            $this->fakeSettings(),
+            $llm,
+            new FakeTicketProcessingLoggerService
+        );
+
+        $ticket = Ticket::query()->create(['message' => 'vraag']);
+        $article = Article::query()->create(['title' => 'DNS', 'content' => 'steps']);
+
+        $reply = $service->build($ticket, $article, 'relevant');
+
+        $this->assertStringContainsString('Gebruik het kennisbankartikel', $reply);
+    }
+
+    private function fakeSettings(): AppSettingsService
+    {
+        return new class extends AppSettingsService {
+            public function getPrompt(string $key, ?string $default = null): ?string
+            {
+                return 'Prompt';
+            }
+        };
+    }
+}