ModelTest code is now hosted here:

https://invent.kde.org/qt/qt/qt/-/tree/4.8/tests/auto/modeltest

ModelTest was originally taken from here:

http://labs.trolltech.com/page/Projects/Itemview/Modeltest

KDevelop also uses it:

https://invent.kde.org/kdevelop/kdevelop/-/tree/master/kdevplatform/tests
