Add extensive controller and model tests

tests/Unit/AttachmentModelTest.php

@@ -0,0 +1,72 @@
+<?php
+
+use App\Models\Attachment;
+use App\Models\AttachmentExtension;
+use App\Models\AttachmentGroup;
+use App\Models\Forum;
+use App\Models\Post;
+use App\Models\Thread;
+use App\Models\User;
+
+it('exposes attachment relationships', function (): void {
+    $category = Forum::create([
+        'name' => 'Category',
+        'description' => null,
+        'type' => 'category',
+        'parent_id' => null,
+        'position' => 1,
+    ]);
+    $forum = Forum::create([
+        'name' => 'Forum',
+        'description' => null,
+        'type' => 'forum',
+        'parent_id' => $category->id,
+        'position' => 1,
+    ]);
+
+    $user = User::factory()->create();
+    $thread = Thread::create([
+        'forum_id' => $forum->id,
+        'user_id' => $user->id,
+        'title' => 'Thread',
+        'body' => 'Body',
+    ]);
+    $post = Post::create([
+        'thread_id' => $thread->id,
+        'user_id' => $user->id,
+        'body' => 'Post',
+    ]);
+
+    $group = AttachmentGroup::create([
+        'name' => 'Docs',
+        'max_size_kb' => 100,
+        'is_active' => true,
+    ]);
+    $extension = AttachmentExtension::create([
+        'extension' => 'pdf',
+        'attachment_group_id' => $group->id,
+        'allowed_mimes' => ['application/pdf'],
+    ]);
+
+    $attachment = Attachment::create([
+        'thread_id' => $thread->id,
+        'post_id' => $post->id,
+        'attachment_extension_id' => $extension->id,
+        'attachment_group_id' => $group->id,
+        'user_id' => $user->id,
+        'disk' => 'local',
+        'path' => 'attachments/posts/'.$post->id.'/file.pdf',
+        'original_name' => 'file.pdf',
+        'extension' => 'pdf',
+        'mime_type' => 'application/pdf',
+        'size_bytes' => 10,
+    ]);
+
+    $attachment->load(['thread', 'post', 'extension', 'group', 'user']);
+
+    expect($attachment->thread?->id)->toBe($thread->id);
+    expect($attachment->post?->id)->toBe($post->id);
+    expect($attachment->extension()->first()?->id)->toBe($extension->id);
+    expect($attachment->group()->first()?->id)->toBe($group->id);
+    expect($attachment->user?->id)->toBe($user->id);
+});