file/tests/Base/FreshMongodbDatabase.php

<?php

namespace Tests\Base;

use Illuminate\Support\Facades\File;

trait FreshMongodbDatabase
{
    public function setUp(): void
    {
        parent::setUp();
        $this->clearAllCollections();
    }

    public function clearAllCollections() {
        $path = app_path('Documents');
        $files = File::allFiles($path);

        foreach ($files as $file) {
            $className = str_replace('.php', '', $file->getFileName());
            if ($className === 'BaseDocument'){
                continue;
            }
            call_user_func('App\\Documents\\' . $className . "::truncate");
        }
    }
}