feat: 初始化知识库系统项目

- 实现基于 Laravel 11 和 Filament 3.X 的文档管理系统
- 添加用户认证和分组管理功能
- 实现文档上传、分类和权限控制
- 集成 Word 文档自动转换为 Markdown
- 集成 Meilisearch 全文搜索引擎
- 实现文档在线预览功能
- 添加安全日志和审计功能
- 完整的简体中文界面
- 包含完整的项目文档和部署指南

技术栈:
- Laravel 11.x
- Filament 3.X
- Meilisearch 1.5+
- Pandoc 文档转换
- Redis 队列系统
- Pest PHP 测试框架

tests/Feature/DocumentPreviewServiceTest.php

@@ -0,0 +1,70 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Document;
+use App\Models\Group;
+use App\Models\User;
+use App\Services\DocumentPreviewService;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Http\UploadedFile;
+use Illuminate\Support\Facades\Storage;
+use Tests\TestCase;
+
+class DocumentPreviewServiceTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected DocumentPreviewService $previewService;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $this->previewService = new DocumentPreviewService();
+        Storage::fake('local');
+    }
+
+    public function test_可以检查文档是否支持预览(): void
+    {
+        $user = User::factory()->create();
+        
+        // 创建一个 .docx 文档
+        $document = Document::factory()->create([
+            'file_name' => 'test.docx',
+            'uploaded_by' => $user->id,
+        ]);
+        
+        $this->assertTrue($this->previewService->canPreview($document));
+        
+        // 创建一个 .doc 文档
+        $document2 = Document::factory()->create([
+            'file_name' => 'test.doc',
+            'uploaded_by' => $user->id,
+        ]);
+        
+        $this->assertTrue($this->previewService->canPreview($document2));
+        
+        // 创建一个不支持的格式
+        $document3 = Document::factory()->create([
+            'file_name' => 'test.pdf',
+            'uploaded_by' => $user->id,
+        ]);
+        
+        $this->assertFalse($this->previewService->canPreview($document3));
+    }
+
+    public function test_文档不存在时抛出异常(): void
+    {
+        $user = User::factory()->create();
+        $document = Document::factory()->create([
+            'file_path' => 'documents/2024/01/01/nonexistent.docx',
+            'file_name' => 'nonexistent.docx',
+            'uploaded_by' => $user->id,
+        ]);
+
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessage('文档文件不存在');
+        
+        $this->previewService->convertToHtml($document);
+    }
+}