public function testGetScopedColumns()
 {
     $category = new Category();
     $this->assertEquals($category->getScopedColumns(), array());
     $category = new ScopedCategory();
     $this->assertEquals($category->getScopedColumns(), array('company_id'));
     $category = new MultiScopedCategory();
     $this->assertEquals($category->getScopedColumns(), array('company_id', 'language'));
 }