Fix test warnings
This merge request fixes test warnings as well as ensure that the QT_QPA_PLATFORM environment variable is set to run the tests.
This will make the tests running with the offscreen plugin in all cases.
Edited by Samuel GAIST
This merge request fixes test warnings as well as ensure that the QT_QPA_PLATFORM environment variable is set to run the tests.
This will make the tests running with the offscreen plugin in all cases.