public function testNext()
{
$root = new RootNode();
$parent_one = $this->createParentNode();
$one = $this->createNode();
$parent_one->append($one);
$first = $this->createNode();
$parent_one->append($first);
$root->append($parent_one);
$parent_two = $this->createParentNode();
$two = $this->createNode();
$parent_two->append($two);
$second = $this->createNode();
$parent_two->append($second);
$root->append($parent_two);
$collection = new NodeCollection([$one, $two]);
$matches = $collection->next();
$this->assertCount(2, $matches);
$this->assertSame($first, $matches[0]);
$this->assertSame($second, $matches[1]);
}
