Add comprehensive test coverage and update notes

tests/Feature/PostControllerTest.php

@@ -8,6 +8,30 @@ use App\Models\Thread;
 use App\Models\User;
 use Laravel\Sanctum\Sanctum;
 
+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 makeThread(): Thread
 {
     $category = Forum::create([