"There is no active transaction" when refreshing database in Laravel 8.0 test

php mysql laravel phpunit

PHP Snippet 1:

use Illuminate\Database\Connection as DBConnection;
use Closure;

class Connection extends DBConnection
{

    public function transaction(Closure $callback, $attempts = 1)
    {
        $callback($this);
    }
}

PHP Snippet 2:

if(config('app.env')==='testing') {
   $this->app->bind(ConnectionInterface::class, Connection::class);
}

PHP Snippet 3:

<php>
   <env name="APP_ENV" value="testing"/>
   <!-- <env name="DB_CONNECTION" value="memory_testing"/> -->
   <!-- <env name="DB_DATABASE" value=":memory:"/> -->
</php>