set up travis CI for unit tests

Author: Remi-Gau

.travis.yml

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+# Travis CI (https://travis-ci.org/)
+
+language: c
+dist: bionic
+cache:
+  apt: true # only works with Pro version
+
+env:
+  global:
+    - OCTFLAGS="--no-gui --no-window-system --silent"
+
+before_install:
+  - travis_retry sudo apt-get -y -qq update
+  - travis_retry sudo apt-get -y install octave
+  - travis_retry sudo apt-get -y install liboctave-dev
+  - travis_retry sudo apt-get -y install nodejs
+  - travis_retry sudo apt-get -y install npm
+
+install:
+  # Install JSONio
+  #- travis_retry git clone git://github.com/gllmflndn/JSONio.git --depth 1
+  #- cd JSONio; mkoctfile --mex jsonread.c jsmn.c -DJSMN_PARENT_LINKS; cd ..
+  #- octave $OCTFLAGS --eval "addpath (fullfile (pwd, 'JSONio')); savepath ();"
+  # Install BIDS-MATLAB
+  - octave $OCTFLAGS --eval "addpath (pwd); savepath ();"
+  # Install BIDS-Validator
+  #- sudo npm install -g bids-validator
+
+before_script:
+  # Change current directory
+  - cd tests
+
+script:
+  - octave $OCTFLAGS --eval "results = bids_runtests; assert(all(~[results.Failed]))"

tests/bids_runtests.m

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+function results = bids_runtests(pth)
+% Run tests
+% List all the 'test_*.m' files located in the same directory as this
+% function, run them and keep track of how many passed, failed or are
+% incomplete.
+%__________________________________________________________________________
+
+% Copyright (C) 2019, Guillaume Flandin, Wellcome Centre for Human Neuroimaging
+% Copyright (C) 2020--, CPP_BIDS developers
+
+%-Get the path of where this file is located
+if ~nargin, pth = fileparts(mfilename('fullpath')); end
+
+%-List all the 'test_*.m' files located in the same directory as this
+% function
+d = dir(pth);
+d([d.isdir]) = [];
+d(arrayfun(@(x) isempty(regexp(x.name,'^test_.*\.m$','once')),d)) = [];
+
+results = struct('Passed',{},'Failed',{},'Incomplete',{},'Duration',{});
+for i=1:numel(d)
+
+    results(i).Failed = false;
+    results(i).Passed = false;
+    results(i).Incomplete = false;
+
+    tstart = tic;
+
+    %-Run each test file and catch error message in case of failure
+    try
+
+        fprintf('%s',d(i).name(1:end-2));
+        feval(d(i).name(1:end-2));
+        results(i).Passed = true;
+    catch err
+        results(i).Failed = true;
+        fprintf('\n%s',err.message);
+    end
+
+    results(i).Duration = toc(tstart);
+
+    fprintf('\n');
+
+end
+
+if ~nargout
+    fprintf(['Totals (%d tests):\n\t%d Passed, %d Failed, %d Incomplete.\n' ...
+        '\t%f seconds testing time.\n\n'],numel(results),nnz([results.Passed]),...
+        nnz([results.Failed]),nnz([results.Incomplete]),sum([results.Duration]));
+end