I along with my team recently developed TUG, an open-source framework for Qt GUIs Unit Testing. It uses Qt Test. Maybe it can help you.
A video better than a thousand words:
https://www.youtube.com/watch?v=tUis6JrycrA
Hope we can make it better together. Github repo: http://pedromateo.github.io/tug_qt_unit_testing_fw/