public function testNested()
{
$manager = new Manager();
$a = $manager->namedStart('A');
$b = $manager->namedStart('B');
$this->assertNull($a->getParent());
$this->assertSame($a, $b->getParent());
$this->assertSame($b, $manager->stop());
$c = $manager->namedStart('C');
$this->assertSame($a, $c->getParent());
$d = $manager->namedStart('D');
$this->assertSame($d, $manager->stop());
$this->assertSame($c, $manager->stop());
$this->assertSame($a, $manager->stop());
$e = $manager->namedStart('E');
$this->assertSame($e, $manager->stop());
$this->assertSame($a, $manager->getIterator()->offsetGet(0));
$this->assertSame($b, $a->getIterator()->offsetGet(0));
$this->assertSame($c, $a->getIterator()->offsetGet(1));
$this->assertSame($d, $c->getIterator()->offsetGet(0));
$this->assertSame($e, $manager->getIterator()->offsetGet(1));
$z = $manager->namedStart('Z');
$this->assertSame($z, $manager->discard());
$this->assertSame(2, $manager->getIterator()->count());
}
