public function test_indexof()
{
$object1 = new stdClass();
$object2 = new stdClass();
$collection = new Collection(array(10, 20, array('id' => 30), $object1, $object2));
$this->assertSame(1, $collection->indexOf(20));
$this->assertSame(2, $collection->indexOf(array('id?' => 30)));
$this->assertSame(4, $collection->indexOf($object2));
}