public function test_sort()
{
$data = new Collection(array(5, 3, 1, 2, 4));
$data->sort(function ($a, $b) {
if ($a === $b) {
return 0;
}
return $a < $b ? -1 : 1;
});
$this->assertEquals(range(1, 5), array_values($data->all()));
}
