In order to assure that the preprocessor and building scripts work as intended, every script comes with a collection of tests. The test suites also reside in the subdirectory `bin` and carry the filename prefix `test_`. Every test that comes with reference files come with an additional subdirectory `/testing/test_name-of-your-sub`.
The tests are run on GitLab after each change in `/bin` and `/testing`, see [CI/CD](Continuous-Integration-and-Continuous-Deployment#docker-test-and-testing) for details.