Broken pytest-sugar causes tests to fail

[digitalformula]

When running make test or make test_all, an exception is generated by an incompatibility between the installed version of pytest-sugar and pytest 5.4.0+.

Fix when running these versions together is to downgrade pytest to version 5.3.5:

(venv) pip3 uninstall pytest
(venv) pip3 install pytest==5.3.5

This requires changes in dev-requirements.txt. Confirmed after discussion with @abhijeetkaurav1st who is running pytest 5.3.4.

Related issue: Teemu/pytest-sugar#187