public function testNatcasesort()
{
$ar = new ArrayObject(array('IMG0.png', 'img12.png', 'img10.png', 'img2.png', 'img1.png', 'IMG3.png'));
$sorted = $ar->getArrayCopy();
natcasesort($sorted);
$ar->natcasesort();
$this->assertSame($sorted, $ar->getArrayCopy());
}
