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: sstest.m
    path of file: ./repos/SuiteSparse/MATLAB_Tools/SSMULT
    
    the code of the file until where you have to start completion: function sstest
%SSTEST exhaustive performance test for SSMULT.
%
% Example
%   sstest
%
% See also ssmult, ssmultsym, ssmult_install, sstest2, mtimes.

% SSMULT, Copyright (c) 2007-2011, Timothy A Davis. All Rights Reserved.
% SPDX-License-Identifier: GPL-2.0+


    
function sstest
%SSTEST exhaustive performance test for SSMULT.
%
% Example
%   sstest
%
% See also ssmult, ssmultsym, ssmult_install, sstest2, mtimes.

% SSMULT, Copyright (c) 2007-2011, Timothy A Davis. All Rights Reserved.
% SPDX-License-Identifier: GPL-2.0+

N = [500:50:1000 1100:100:3000 3200:200:5000 ] ;

% warmup for more accurate timings
A = sparse (1) ;
B = sparse (1) ;
C = A*B ;
D = ssmult(A,B) ;
err = norm (C-D,1) ;
if (err > 0)
    error ('test failure') ;
end