PAIREF package includes tests to check potential errors in the module code and setting. Framework pytest is used and has to be installed (this can be done running a following command:
cctbx.python -m pip install pytest --user. Unfortunately, tests are not supported for Windows now.
To run the test, download the code from PyPI repository and open terminal in a folder test. There, all the tests can be executed using e.g. a following command:
cctbx.python -m pytest -vv -s