JBZoo\Data\Data::has PHP Method

    public function has($name)
    {
        return $this->offsetExists($name);
    }

 public function testUnset()
 {
     // like object
     $data = new Data($this->_test);
     is('qwerty', $data->get('string'));
     unset($data->string);
     isFalse($data->has('string'));
     // like array
     $data = new Data($this->_test);
     is('qwerty', $data['string']);
     unset($data['string']);
     isFalse($data->has('string'));
 }