function trials = buildTestTrials(disp_struct, task_struct)
    
    % full cross-combination of all stimuli
    [p,q] = meshgrid(1:length(task_struct.pWin), 1:length(task_struct.pWin));
    pairs = repmat([p(:) q(:)], 2, 1);
    % remove stimuli paired with themselves
    pairs( pairs(:,1) == pairs(:,2), : ) = [];
    % double the bias pairs
    pairs = [pairs; repmat([1 2 3 4; 5 6 7 8]', 4, 1)];
    
    % define the trials
    trials = nan(size(pairs, 1), task_struct.cRT);
    trials(:, task_struct.cBlock) = 0;
    trials(:, task_struct.cTrialNum) = 1:size(trials, 1);
    trials(:, task_struct.cTrialID) = 1:size(trials, 1);
    trials(:, task_struct.cTrialCond) = task_struct.FC;
    trials(:, task_struct.cTrialType) = task_struct.TEST;
    trials(:, task_struct.cS1) = pairs(:, 1);
    trials(:, task_struct.cS2) = pairs(:, 2);
    trials(:, task_struct.cIsS1Left) = rand(size(trials, 1), 1) > 0.5;
    
    % randomize
    trials = trials(randperm(size(trials,1)), :);
end % function