function widget_test($args)
{
  extract($args);
  print($before_widget);
  print($before_title);
  print('Widget Title');
  print($after_title);
  print('This is a widget body');
  print($after_widget);
}
 
function widget_test_init()
{
  register_sidebar_widget(__('My Test Widget'), 'widget_test');
}
add_action("plugins_loaded", "widget_test_init");