public function testDate()
{
$rootNode = $this->session->getNode('/');
$child1 = $rootNode->addNode('child1');
$date = new \DateTime();
$before = $date->format('c');
$child1->setProperty('date', $date);
$this->session->save();
$after = $date->format('c');
$this->assertEquals($before, $after);
}