public function testSet_title()
{
$update1 = $this->object->get_updated_on();
sleep(1);
$new_title = 'Cigares du pharaon';
$this->object->set_title($new_title);
$this->assertEquals($new_title, $this->object->get_title());
$update2 = $this->object->get_updated_on();
$this->assertTrue($update2 > $update1);
}