public function testExceptReturnsCollectionWithoutGivenModelKeys()
{
$e1 = new Entity();
$e1->id = 1;
$e2 = new Entity();
$e2->id = '2';
$e3 = new Entity();
$e3->id = 3;
$c = new Collection([$e1, $e2, $e3]);
$this->assertEquals(new Collection(array($e1, $e3)), $c->except(2));
$this->assertEquals(new Collection(array($e1)), $c->except(array(2, 3)));
}
