Hello. Apologies for the radio silence on my end.

I've noticed that the unit tests for Ubuntu 20.04 aren't running at the moment. Would be it worthwhile for me to look at why it isn't working on my end or if there's a potentially easy solution we can try?

Sure, have a look at it. I suspect it is a dependency missing from the Ubuntu image. It would have to installed. I vaguely remember someone pointing out that some other X11 related package is needed sometimes.

Prior to approving the changed workflow some notes:

• Following local testing of the actions using act and looking at the container it was using I've found that the libqxcb.so plugin was missing some dependencies - adding the libxcb-icccm4, libxcb-shape0, libxkbcommon-x11-0, libxcb-xkb1, libxcb-cursor0 & libxcb-keysyms1 packages fixed this issue.
• Ran into an issue where qt.qpa.xcb: could not connect to display was happening until xvfb-run was added to the run tests step. xvfb is available in the runner image. Added a step for running the tests in Ubuntu like we do when fetching the packages. Hopefully the check for when we are not Ubuntu will behave itself on Windows & macOS builds.

As an alternative to the above we can set the environment variable QT_QPA_PLATFORM to offscreen in the Run tests step - this does work although it does complain about certain functions/features not being implemented.

Any further thoughts on the workflow changes?