These are some unit tests to ensure that Plang is behaving correctly.
You can run each test with (assuming you haven't installed Plang to your PATH):
$ ../bin/runtests [file...]
where [file...] is an optional list of files to test. If omitted, all files
in this directory will be tested.
E.g., to test operators.pt and types.pt you can run:
$ ../bin/runtests operators.pt types.pt
See ../bin/runtests -h for more options.