symfony/tests/Symfony/Tests/Component/Config/Definition/Builder/ArrayNodeDefinitionTest.php

<?php

namespace Symfony\Tests\Component\Config\Definition\Builder;

use Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition;
use Symfony\Component\Config\Definition\Builder\ScalarNodeDefinition;

class ArrayNodeDefinitionTest extends \PHPUnit_Framework_TestCase
{
    public function testAppendingSomeNode()
    {
        $parent = new ArrayNodeDefinition('root');
        $child = new ScalarNodeDefinition('child');

        $node = $parent
            ->children()
                ->scalarNode('foo')->end()
                ->scalarNode('bar')->end()
            ->end()
            ->append($child);

        $this->assertEquals(count($this->getField($parent, 'children')), 3);
        $this->assertTrue(in_array($child, $this->getField($parent, 'children')));
    }

    protected function getField($object, $field)
    {
        $reflection = new \ReflectionProperty($object, $field);
        $reflection->setAccessible(true);

        return $reflection->getValue($object);
    }
}