/**
* Test add and remove item
*/
public function testAddRemoveItem()
{
$country = new Category();
$this->assertEquals(0, $country->getItems()->count());
$country->addItem(new Item());
$this->assertEquals(1, $country->getItems()->count());
$item = $country->getItems()->first();
$country->removeItem($item);
$this->assertEquals(0, $country->getItems()->count());
}