With alkonlinequotetest/KF5 configured with the use of QWebEngine and without X-display I get at execution:

QWARN  : AlkOnlineQuoteTest::testLaunchWebKit() WebEngine compiled with X11 support, however qpa backend is not xcb. This may fail.
QWARN  : AlkOnlineQuoteTest::testLaunchWebKit() QObject::connect: Cannot connect (null)::destroyed(QObject*) to QOffscreenSurface::screenDestroyed(QObject*)
KCrash: Application 'alkonlinequotestest' crashing...
Executable is: "/root/src/alkimia-master-build/bin/alkonlinequotestest"

> KCrash: Application 'alkonlinequotestest' crashing..
(gdb) bt
#0  QOffscreenSurface::create (this=this@entry=0x65dcc0) at kernel/qoffscreensurface.cpp:182
#1  0x00007ffff15613f8 in (anonymous namespace)::openGLVendor () at /usr/src/debug/libqt5-qtwebengine-5.9.7-lp151.1.42.x86_64/src/core/web_engine_context.cpp:184
#2  QtWebEngineCore::WebEngineContext::WebEngineContext (this=0x67de80) at /usr/src/debug/libqt5-qtwebengine-5.9.7-lp151.1.42.x86_64/src/core/web_engine_context.cpp:429
#3  0x00007ffff1562585 in QtWebEngineCore::WebEngineContext::current () at /usr/src/debug/libqt5-qtwebengine-5.9.7-lp151.1.42.x86_64/src/core/web_engine_context.cpp:272
#4  0x00007ffff1550e8d in QtWebEngineCore::WebContentsAdapterPrivate::WebContentsAdapterPrivate (this=0x665d20) at /usr/src/debug/libqt5-qtwebengine-5.9.7-lp151.1.42.x86_64/src/core/web_contents_adapter.cpp:353
#5  0x00007ffff15511be in QtWebEngineCore::WebContentsAdapter::WebContentsAdapter (this=0x67e430, webContents=0x0) at /usr/src/debug/libqt5-qtwebengine-5.9.7-lp151.1.42.x86_64/src/core/web_contents_adapter.cpp:392
#6  0x00007ffff74a1091 in QSharedPointer<QtWebEngineCore::WebContentsAdapter>::create<>() () at /usr/include/qt5/QtCore/qsharedpointer_impl.h:442
#7  QWebEnginePagePrivate::QWebEnginePagePrivate (this=0x68e0a0, _profile=0x0) at api/qwebenginepage.cpp:242
#8  0x00007ffff74a1c04 in QWebEnginePage::QWebEnginePage (this=0x67cf60, parent=<optimized out>) at api/qwebenginepage.cpp:700
#9  0x00007ffff7bc0fb0 in AlkWebPage::AlkWebPage(QObject*) () from ~/src/alkimia-master-build/bin/libalkimia5.so.8
#10 0x00007ffff7bba753 in AlkOnlineQuotesProfileManager::webPage() () from ~/src/alkimia-master-build/bin/libalkimia5.so.8
#11 0x00007ffff7bad1a9 in AlkOnlineQuote::Private::launchWebKitHtmlParser(QString const&, QString const&, QString const&) () from ~/src/alkimia-master-build/bin/libalkimia5.so.8
#12 0x00007ffff7baf924 in AlkOnlineQuote::launch(QString const&, QString const&, QString const&) () from ~/src/alkimia-master-build/bin/libalkimia5.so.8
#13 0x000000000040657e in AlkOnlineQuoteTest::testLaunchWebKit() ()
#14 0x0000000000408b9e in AlkOnlineQuoteTest::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) ()
#15 0x00007fffebf496d3 in QMetaMethod::invoke (this=<optimized out>, object=0x7fffffffe090, connectionType=connectionType@entry=Qt::DirectConnection, returnValue=..., val0=..., val1=..., val2=..., val3=..., val4=..., val5=..., 
    val6=..., val7=..., val8=..., val9=...) at kernel/qmetaobject.cpp:2222
#16 0x00007ffff797401a in QMetaMethod::invoke (val9=..., val8=..., val7=..., val6=..., val5=..., val4=..., val3=..., val2=..., val1=..., val0=..., connectionType=Qt::DirectConnection, object=<optimized out>, this=<optimized out>)
    at ../../include/QtCore/../../src/corelib/kernel/qmetaobject.h:123
#17 QTest::TestMethods::invokeTestOnData (this=this@entry=0x7fffffffdfd0, index=index@entry=2) at qtestcase.cpp:888
#18 0x00007ffff7974d70 in QTest::TestMethods::invokeTest (this=this@entry=0x7fffffffdfd0, index=index@entry=2, data=data@entry=0x0, watchDog=watchDog@entry=0x0) at qtestcase.cpp:1069
#19 0x00007ffff79752e1 in QTest::TestMethods::invokeTests (this=this@entry=0x7fffffffdfd0, testObject=testObject@entry=0x7fffffffe090) at qtestcase.cpp:1376
#20 0x00007ffff79758ab in QTest::qExec (testObject=0x7fffffffe090, argc=<optimized out>, argv=0x7fffffffe1b8) at qtestcase.cpp:1797
#21 0x0000000000405edd in main ()

One of the reason for this is that the usage of QTEST_MAIN() in the test case source results into generating a gui application depending on a graphical display.

Git commit 1507ef16f01c83b0164446573aeb5fbd3a3828d5 by Ralf Habacker.
Committed on 11/11/2020 at 20:46.
Pushed by habacker into branch '8.0'.

Generate autotests, which do not require a graphical display, as command line app

M  +3    -3    autotests/alkcompanytest.cpp
M  +3    -3    autotests/alkdateformattest.cpp
M  +2    -2    autotests/alkexceptiontest.cpp
M  +2    -3    autotests/alkonlinequotesourcetest.cpp
M  +3    -3    autotests/alkquoteitemtest.cpp
M  +2    -3    autotests/alkvaluetest.cpp
A  +16   -0    autotests/test.h  *

The files marked with a * at the end have a non valid license. Please read: https://community.kde.org/Policies/Licensing_Policy and use the headers which are listed at that page.


https://invent.kde.org/office/alkimia/commit/1507ef16f01c83b0164446573aeb5fbd3a3828d5

Another issue is that in the native launch mode, kio wants to create a downlod ui dialog
 
QDEBUG : AlkOnlineQuoteTest::testLaunch() alkonlinequotestest(6255)/kio (KIOJob) KIO::SlaveInterface::dispatch: needs a msg box
QFATAL : AlkOnlineQuoteTest::testLaunch() QWidget: Cannot create a QWidget when no GUI is being used

The ALkOnlineQuote class currently uses the KDE framework library KIO to fetch files from remote locations, which requires a GUI. A possible solution would be to use the corresponding classes of the QtNetwork module in the ALkOnlineQuote class, which does not have this dependency.

(In reply to Ralf Habacker from comment #6)
> The ALkOnlineQuote class currently uses the KDE framework library KIO to
> fetch files from remote locations, which requires a GUI. A possible solution
> would be to use the corresponding classes of the QtNetwork module in the
> ALkOnlineQuote class, which does not have this dependency.

Unfortunately, this change does not solve the problem yet, because the framework library KNewStuff depends on KIOWidgets and KIOCore library.