public function testIndex()
{
$item1 = 'item 1';
$item2 = 'item 2';
$item3 = 'item 3';
$items = [$item1, $item2];
$list = new ArrayList($items);
$index1 = $list->indexOf($item1);
$this->assertEquals(0, $index1);
$this->assertEquals(1, $list->indexOf($item2));
$this->assertFalse($list->indexOf($item3));
$list->removeAll($items);
$list->addAll($items);
$this->assertEquals(2, $list->size());
$this->assertEquals($index1, $list->indexOf($item1));
$list->add($item3, 1);
$this->assertEquals($item3, $list->get(1));
$this->assertEquals($item2, $list->get(2));
}
