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/usr/share/psychtoolbox-3/PsychTests/ScreenTest.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.

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% ScreenTest
%
% Test hardware/software configuration for performance.
%
% 10/14/06  dhb  Wrote stub version.

% Get all screens
screens = Screen('Screens');

% Test each screen
for screen = screens
    fprintf('\n***** ScreenTest: Testing Screen %d *****\n',screen);
    
    % Open window.  Prints some diagnostics all on its own.
    w = Screen('OpenWindow',screen);
    
    % Close window
    Screen('Close',w);
    
    fprintf('\n***** ScreenTest: Done With Screen %d *****\n',screen);
end