You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: voc2007_test_ss.m
    path of file: ./repos/faster_rcnn/experiments/+Dataset
    
    the code of the file until where you have to start completion: function dataset = voc2007_test_ss(dataset, usage, use_flip)
% Pascal voc 2007 test set with selective search
% set opts.imdb_train opts.roidb_train 
% or set opts.imdb_test opts.roidb_train

    
function dataset = voc2007_test_ss(dataset, usage, use_flip)
% Pascal voc 2007 test set with selective search
% set opts.imdb_train opts.roidb_train 
% or set opts.imdb_test opts.roidb_train

% change to point to your devkit install
devkit                      = voc2007_devkit();

switch usage
    case {'train'}
        dataset.imdb_train    = {  imdb_from_voc(devkit, 'test', '2007', use_flip) };
        dataset.roidb_train   = cellfun(@(x) x.roidb_func(x, 'with_selective_search', true), dataset.imdb_train, 'UniformOutput', false);
    case {'test'}
        dataset.imdb_test     = imdb_from_voc(devkit, 'test', '2007', use_flip) ;
        dataset.roidb_test    = dataset.imdb_test.roidb_func(dataset.imdb_test, 'with_selective_search', true);
    otherwise
        error('usage = ''train'' or ''test''');
end