public function testConvertObjectList()
 {
     $list = array(TestCity::create()->setId(42)->setName('Beldyazki'), TestCity::create()->setId(666)->setName('Moscow'));
     $this->assertEquals(array(42, 666), array_keys(ArrayUtils::convertObjectList($list)));
     $this->assertEquals(array('Beldyazki', 'Moscow'), array_keys(ArrayUtils::convertObjectList($list, 'getName')));
 }