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: vl_test.m
    path of file: ./repos/robotic_perception/Trafic_Sign_Recognition/code/vlfeat-0.9.20-bin/vlfeat-0.9.20/toolbox/xtest
    
    the code of the file until where you have to start completion: function results = vl_test(suite, test)
% VL_TEST  Run test suite
%  RESULTS = VL_TEST() runs all VLFeat test suites. The tests
%  verify that VLFeat is working correctly.
%
%  RESULTS is a structure listing the result of each test.
%  It has fileds:
%
%  TESTNAME:   name of the test
%  SUCCEDED:   a boolean flag indicating whether the test succeded
%  EXCEPTION:  the exception generated if the test failed
%
%  VL_TEST(SUITE) runs only the specified SUITE.
%
%  VL_TEST(SUITE, TEST) runs the specified SUITE/TEST without catching
%  the potential exception. Useful to DBSTOP to debug.

% Author: Andrea Vedaldi

% Copyright (C) 2013-14 Andrea Vedaldi.
% Copyright (C) 2007-12 Andrea Vedaldi and Brian Fulkerson.

    
function results = vl_test(suite, test)
% VL_TEST  Run test suite
%  RESULTS = VL_TEST() runs all VLFeat test suites. The tests
%  verify that VLFeat is working correctly.
%
%  RESULTS is a structure listing the result of each test.
%  It has fileds:
%
%  TESTNAME:   name of the test
%  SUCCEDED:   a boolean flag indicating whether the test succeded
%  EXCEPTION:  the exception generated if the test failed
%
%  VL_TEST(SUITE) runs only the specified SUITE.
%
%  VL_TEST(SUITE, TEST) runs the specified SUITE/TEST without catching
%  the potential exception. Useful to DBSTOP to debug.

% Author: Andrea Vedaldi

% Copyright (C) 2013-14 Andrea Vedaldi.
% Copyright (C) 2007-12 Andrea Vedaldi and Brian Fulkerson.
% All rights reserved.
%
% This file is part of the VLFeat library and is made available under
% the terms of the BSD license (see the COPYING file).

clear functions ;

testRoot = fileparts(mfilename('fullpath')) ;

if nargin == 0
  files = dir(fullfile(testRoot, 'vl_test_*.m')) ;
elseif nargin == 1
  files.name = fullfile(['vl_test_' suite '.m']) ;
end