public function testHas()
{
$container = new SortingContainer();
$container->add('foo', 'f.bar');
$this->assertTrue($container->has('foo'));
$this->assertFalse($container->has('bar'));
}
/**
* Add a sorting to the sorting container
*
* @param string $key Key
* @param string $field Field
* @param string $label Label
*
* @return Paginator
*/
public function addSorting($key, $field, $label = null)
{
$this->sortings->add($key, $field, $label);
return $this;
}