> Append a one-line summary to the output of running ./src/qt/test/test_bitcoin-qt indicating that all tests passed or showing the number of failing tests. It's currently a bit inconvenient to see this result by eyeballing all of the output.
This PR also adds an `#include <QDebug>` in test_main.cpp which was missed in D18200 when introducing a `qWarning() << ...`. From the [Qt doc](https://doc.qt.io/archives/qt-5.15/qtglobal.html#qWarning):
> If you include <QtDebug>, a more convenient syntax is also available
> `qWarning() << "..."``
This is a backport of core-gui#576
Depends on D18204