public function testPop()
{
$list = new CommaListNode();
$list->appendItem($this->createNode('$a'));
$list->appendItem($this->createNode('$b'));
$list->appendItem($this->createNode('$c'));
$this->assertEquals('$c', $list->pop()->getText());
$items = $list->getItems();
$this->assertCount(2, $items);
$this->assertEquals('$a', $items[0]->getText());
$this->assertEquals('$b', $items[1]->getText());
$this->assertEquals('$b', $list->pop()->getText());
$items = $list->getItems();
$this->assertCount(1, $items);
$this->assertEquals('$a', $items[0]->getText());
$this->assertEquals('$a', $list->pop()->getText());
$items = $list->getItems();
$this->assertCount(0, $items);
$this->assertNull($list->pop());
}
