pytest >= 4.4.1, < 5
pytest-helpers-namespace >= 2019.1.8
pytest-xdist == 1.28.0
pytest-cov >= 2.6.1
python-xmp-toolkit   # requires apt-get install libexempi3
                     # or brew install exempi
PyPDF2 >= 1.26.0
#PyMuPDF == 1.13.4    # optional
