public function testIterator()
{
$array = array('key 1' => 'value 1', 'key 2' => array('key 3' => array('key 4' => 'value 2')));
$structure = new Structure($array);
$iterator = $structure->getIterator();
$output = '';
foreach ($iterator as $key => $value) {
$output .= $key . '-';
}
$this->assertEquals('key 1-key 2[key 3][key 4]-', $output);
}
