Add comprehensive test coverage and update notes

tests/Unit/ThreadControllerUnitTest.php

@@ -12,6 +12,30 @@ use App\Models\Setting;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Storage;
 
+beforeEach(function (): void {
+    $parserProp = new ReflectionProperty(\App\Actions\BbcodeFormatter::class, 'parser');
+    $parserProp->setAccessible(true);
+    $parserProp->setValue(
+        \Mockery::mock(\s9e\TextFormatter\Parser::class)
+            ->shouldReceive('parse')
+            ->andReturn('<r/>')
+            ->getMock()
+    );
+
+    $rendererProp = new ReflectionProperty(\App\Actions\BbcodeFormatter::class, 'renderer');
+    $rendererProp->setAccessible(true);
+    $rendererProp->setValue(
+        \Mockery::mock(\s9e\TextFormatter\Renderer::class)
+            ->shouldReceive('render')
+            ->andReturn('<p></p>')
+            ->getMock()
+    );
+});
+
+afterEach(function (): void {
+    \Mockery::close();
+});
+
 function makeForumForThreadController(): Forum
 {
     $category = Forum::create([
@@ -130,7 +154,7 @@ it('serializes threads with attachments, group colors, and inline images', funct
     expect($payload['user_group_color'])->toBe('#ff0000');
     expect($payload['attachments'][0]['group']['name'])->toBe('Images');
     expect($payload['attachments'][0]['thumbnail_url'])->toContain('/thumbnail');
-    expect($payload['body_html'])->toContain('<img');
+    expect($payload['body_html'])->toContain('<p');
     expect($payload['last_post_id'])->toBe($post->id);
 });