<?php

use Symfony\Component\Config\Definition\Builder\TreeBuilder;
use Symfony\Component\Config\Definition\ConfigurationInterface;
use Symfony\Component\Config\Definition\Processor;

class ConfigurationTest extends \PHPUnit_Framework_TestCase
{
    public function testProcessConfiguration()
    {
        $configs = [
            [
                'array1' => [
                    'key1' => [
                        'array2' => []
                    ],
                    'key2' => [
                        'array3' => []
                    ]
                ]
            ]
        ];

        $processor = new Processor();
        $config = $processor->processConfiguration(new Configuration(), $configs);

        $this->assertArrayHasKey('array1', $config);
        $this->assertEquals($configs[0]['array1'], $config['array1']);
    }
}

class Configuration implements ConfigurationInterface
{
    public function getConfigTreeBuilder()
    {
        $treeBuilder = new TreeBuilder();

        $rootNode = $treeBuilder->root('root');
        $rootNode
            ->children()
            ->arrayNode('array1')
                ->useAttributeAsKey('name')
                ->prototype('array')
                    ->children()
                        ->arrayNode('array2')
                            ->prototype('variable')->end()
//                            ->children()->end()
                        ->end()
                        ->arrayNode('array3')
                            ->prototype('variable')->end()
//                            ->children()->end()
                        ->end()
                    ->end()
                ->end()
        ;

        return $treeBuilder;
    }
}