public function testItCanAddSorting()
{
$originalSort = new Sort(['size', 'pages'], new Order('ASC'));
$sortDesc = new Sort(['words'], new Order('DESC'));
$originalSort->andSort($sortDesc);
$expected = [];
$expected['size'] = new Order('ASC');
$expected['pages'] = new Order('ASC');
$expected['words'] = new Order('DESC');
$this->assertEquals($expected, $originalSort->orders());
}