diff --git a/autotests/CMakeLists.txt b/autotests/CMakeLists.txt
index 101f65990..85d9733b7 100644
--- a/autotests/CMakeLists.txt
+++ b/autotests/CMakeLists.txt
@@ -1,398 +1,400 @@
 add_definitions(-DKWIN_UNIT_TEST)
 remove_definitions(-DQT_USE_QSTRINGBUILDER)
 add_subdirectory(libkwineffects)
 add_subdirectory(libxrenderutils)
 add_subdirectory(integration)
 if (HAVE_INPUT)
     add_subdirectory(libinput)
 endif()
 add_subdirectory(tabbox)
 
 ########################################################
 # Test ScreenPaintData
 ########################################################
 set( testScreenPaintData_SRCS test_screen_paint_data.cpp )
 add_executable(testScreenPaintData ${testScreenPaintData_SRCS})
 target_link_libraries( testScreenPaintData kwineffects Qt5::Test Qt5::Widgets KF5::WindowSystem)
 add_test(kwin-testScreenPaintData testScreenPaintData)
 ecm_mark_as_test(testScreenPaintData)
 
 ########################################################
 # Test WindowPaintData
 ########################################################
 set( testWindowPaintData_SRCS test_window_paint_data.cpp )
 add_executable(testWindowPaintData ${testWindowPaintData_SRCS})
 target_link_libraries( testWindowPaintData kwineffects Qt5::Widgets Qt5::Test )
 add_test(kwin-testWindowPaintData testWindowPaintData)
 ecm_mark_as_test(testWindowPaintData)
 
 ########################################################
 # Test VirtualDesktopManager
 ########################################################
 set( testVirtualDesktops_SRCS
      test_virtual_desktops.cpp
      ../virtualdesktops.cpp
 )
 add_executable(testVirtualDesktops ${testVirtualDesktops_SRCS})
 
 target_link_libraries( testVirtualDesktops
                        Qt5::Test
                        Qt5::Widgets
                        KF5::I18n
                        KF5::GlobalAccel
                        KF5::ConfigCore
                        KF5::WindowSystem
 )
 add_test(kwin-testVirtualDesktops testVirtualDesktops)
 ecm_mark_as_test(testVirtualDesktops)
 
 ########################################################
 # Test ClientMachine
 ########################################################
 set( testClientMachine_SRCS
      test_client_machine.cpp
      ../client_machine.cpp
 )
 add_executable( testClientMachine ${testClientMachine_SRCS} )
 set_target_properties(testClientMachine PROPERTIES COMPILE_DEFINITIONS "NO_NONE_WINDOW")
 
 target_link_libraries( testClientMachine
                        Qt5::Concurrent
                        Qt5::Test
                        Qt5::X11Extras
                        Qt5::Widgets
                        KF5::ConfigCore
                        KF5::WindowSystem
                        XCB::XCB
                        XCB::XFIXES
                        ${X11_X11_LIB} # to make jenkins happy
 )
 add_test(kwin-testClientMachine testClientMachine)
 ecm_mark_as_test(testClientMachine)
 
 ########################################################
 # Test XcbWrapper
 ########################################################
 set( testXcbWrapper_SRCS
      test_xcb_wrapper.cpp
 )
 add_executable( testXcbWrapper ${testXcbWrapper_SRCS} )
 
 target_link_libraries( testXcbWrapper
                        Qt5::Test
                        Qt5::X11Extras
                        Qt5::Widgets
                        KF5::ConfigCore
                        KF5::WindowSystem
                        XCB::XCB
 )
 add_test(kwin-testXcbWrapper testXcbWrapper)
 ecm_mark_as_test(testXcbWrapper)
 
 if (XCB_ICCCM_FOUND)
     add_executable( testXcbSizeHints test_xcb_size_hints.cpp )
     set_target_properties(testXcbSizeHints PROPERTIES COMPILE_DEFINITIONS "NO_NONE_WINDOW")
     target_link_libraries( testXcbSizeHints
                            Qt5::Test
                            Qt5::X11Extras
                            KF5::ConfigCore
                            KF5::WindowSystem
                            XCB::XCB
                            XCB::ICCCM
     )
     add_test(kwin-testXcbSizeHints testXcbSizeHints)
     ecm_mark_as_test(testXcbSizeHints)
 endif()
 
 ########################################################
 # Test XcbWindow
 ########################################################
 set( testXcbWindow_SRCS
      test_xcb_window.cpp
 )
 add_executable( testXcbWindow ${testXcbWindow_SRCS} )
 
 target_link_libraries( testXcbWindow
                        Qt5::Test
                        Qt5::X11Extras
                        Qt5::Widgets
                        KF5::ConfigCore
                        KF5::WindowSystem
                        XCB::XCB
 )
 add_test(kwin-testXcbWindow testXcbWindow)
 ecm_mark_as_test(testXcbWindow)
 
 ########################################################
 # Test BuiltInEffectLoader
 ########################################################
 set( testBuiltInEffectLoader_SRCS
     test_builtin_effectloader.cpp
     mock_effectshandler.cpp
     ../effectloader.cpp
 )
 add_executable( testBuiltInEffectLoader ${testBuiltInEffectLoader_SRCS})
 set_target_properties(testBuiltInEffectLoader PROPERTIES COMPILE_DEFINITIONS "NO_NONE_WINDOW")
 
 target_link_libraries(testBuiltInEffectLoader
     Qt5::Concurrent
     Qt5::Test
     Qt5::X11Extras
     KF5::Package
     kwineffects
     kwin4_effect_builtins
 )
 
 add_test(kwin-testBuiltInEffectLoader testBuiltInEffectLoader)
 ecm_mark_as_test(testBuiltInEffectLoader)
 
 ########################################################
 # Test ScriptedEffectLoader
 ########################################################
 include_directories(${KWIN_SOURCE_DIR})
 set( testScriptedEffectLoader_SRCS
     test_scripted_effectloader.cpp
     mock_effectshandler.cpp
     ../effectloader.cpp
     ../scripting/scriptedeffect.cpp
     ../scripting/scriptingutils.cpp
     ../scripting/scripting_logging.cpp
 )
 add_executable( testScriptedEffectLoader ${testScriptedEffectLoader_SRCS})
 
 target_link_libraries(testScriptedEffectLoader
     Qt5::Concurrent
     Qt5::Script
     Qt5::Test
     Qt5::X11Extras
     KF5::ConfigGui
     KF5::GlobalAccel
     KF5::I18n
     KF5::Package
     kwineffects
     kwin4_effect_builtins
 )
 
 add_test(kwin-testScriptedEffectLoader testScriptedEffectLoader)
 ecm_mark_as_test(testScriptedEffectLoader)
 
 ########################################################
 # Test PluginEffectLoader
 ########################################################
 set( testPluginEffectLoader_SRCS
     test_plugin_effectloader.cpp
     mock_effectshandler.cpp
     ../effectloader.cpp
 )
 add_executable( testPluginEffectLoader ${testPluginEffectLoader_SRCS})
 
 target_link_libraries(testPluginEffectLoader
     Qt5::Concurrent
     Qt5::Test
     Qt5::X11Extras
     KF5::Package
     kwineffects
     kwin4_effect_builtins
 )
 
 add_test(kwin-testPluginEffectLoader testPluginEffectLoader)
 ecm_mark_as_test(testPluginEffectLoader)
 
 ########################################################
 # FakeEffectPlugin
 ########################################################
 add_library(fakeeffectplugin MODULE fakeeffectplugin.cpp)
 set_target_properties(fakeeffectplugin PROPERTIES PREFIX "")
 target_link_libraries(fakeeffectplugin kwineffects)
 
 ########################################################
 # FakeEffectPlugin-Version
 ########################################################
 add_library(effectversionplugin MODULE fakeeffectplugin_version.cpp)
 set_target_properties(effectversionplugin PROPERTIES PREFIX "")
 target_link_libraries(effectversionplugin kwineffects)
 
 ########################################################
 # Test Screens
 ########################################################
 set( testScreens_SRCS
     test_screens.cpp
     mock_abstract_client.cpp
     mock_client.cpp
     mock_screens.cpp
     mock_workspace.cpp
     ../screens.cpp
     ../x11eventfilter.cpp
 )
 kconfig_add_kcfg_files(testScreens_SRCS ../settings.kcfgc)
 
 add_executable( testScreens ${testScreens_SRCS})
 target_include_directories(testScreens BEFORE PRIVATE ./)
 target_link_libraries(testScreens
     Qt5::Test
     Qt5::X11Extras
     KF5::ConfigCore
     KF5::ConfigGui
     KF5::WindowSystem
 )
 
 add_test(kwin_testScreens testScreens)
 ecm_mark_as_test(testScreens)
 
 ########################################################
 # Test XrandRScreens
 ########################################################
 set( testXRandRScreens_SRCS
      test_xrandr_screens.cpp
      mock_abstract_client.cpp
      mock_client.cpp
      mock_screens.cpp
      mock_workspace.cpp
      ../screens.cpp
      ../plugins/platforms/x11/standalone/screens_xrandr.cpp
      ../xcbutils.cpp # init of extensions
      ../x11eventfilter.cpp
 )
 kconfig_add_kcfg_files(testXRandRScreens_SRCS ../settings.kcfgc)
 add_executable( testXRandRScreens ${testXRandRScreens_SRCS} )
 target_link_libraries( testXRandRScreens
                        Qt5::Test
                        Qt5::Gui
                        KF5::ConfigCore
                        KF5::ConfigGui
                        KF5::WindowSystem
                        XCB::XCB
                        XCB::RANDR
                        XCB::XFIXES
                        XCB::SYNC
                        XCB::COMPOSITE
                        XCB::DAMAGE
                        XCB::GLX
                        XCB::SHM
 )
 
 add_test(kwin-testXRandRScreens testXRandRScreens)
 ecm_mark_as_test(testXRandRScreens)
 
 ########################################################
 # Test ScreenEdges
 ########################################################
 set( testScreenEdges_SRCS
     test_screen_edges.cpp
     mock_abstract_client.cpp
     mock_client.cpp
     mock_screens.cpp
     mock_workspace.cpp
     ../atoms.cpp
     ../gestures.cpp
     ../screens.cpp
     ../screenedge.cpp
     ../virtualdesktops.cpp
     ../xcbutils.cpp # init of extensions
     ../plugins/platforms/x11/standalone/edge.cpp
 )
 kconfig_add_kcfg_files(testScreenEdges_SRCS ../settings.kcfgc)
 qt5_add_dbus_interface( testScreenEdges_SRCS ${CMAKE_CURRENT_SOURCE_DIR}/../org.freedesktop.ScreenSaver.xml screenlocker_interface)
 
 add_executable( testScreenEdges ${testScreenEdges_SRCS})
 set_target_properties(testScreenEdges PROPERTIES COMPILE_DEFINITIONS "NO_NONE_WINDOW")
 target_include_directories(testScreenEdges BEFORE PRIVATE ./)
 target_link_libraries(testScreenEdges
     Qt5::DBus
     Qt5::Test
     Qt5::X11Extras
     KF5::ConfigCore
     KF5::ConfigGui
     KF5::I18n
     KF5::GlobalAccel
     KF5::WindowSystem
     XCB::XCB
     XCB::RANDR
     XCB::XFIXES
     XCB::SYNC
     XCB::COMPOSITE
     XCB::DAMAGE
     XCB::GLX
     XCB::SHM
 )
 
 add_test(kwin_testScreenEdges testScreenEdges)
 ecm_mark_as_test(testScreenEdges)
 
 ########################################################
 # Test OnScreenNotification
 ########################################################
 set( testOnScreenNotification_SRCS
     onscreennotificationtest.cpp
     ../onscreennotification.cpp
     ../input_event_spy.cpp
 )
 add_executable( testOnScreenNotification ${testOnScreenNotification_SRCS})
 
 target_link_libraries(testOnScreenNotification
     Qt5::Test
     Qt5::Widgets # QAction include
     Qt5::Quick
     KF5::ConfigCore
 )
 
 add_test(kwin-testOnScreenNotification testOnScreenNotification)
 ecm_mark_as_test(testOnScreenNotification)
 
 ########################################################
 # Test Gestures
 ########################################################
 set( testGestures_SRCS
     test_gestures.cpp
     ../gestures.cpp
 )
 add_executable( testGestures ${testGestures_SRCS})
 
 target_link_libraries(testGestures
     Qt5::Test
 )
 
 add_test(kwin-testGestures testGestures)
 ecm_mark_as_test(testGestures)
 
 ########################################################
 # Test X11 TimestampUpdate
 ########################################################
 add_executable(testX11TimestampUpdate test_x11_timestamp_update.cpp)
+target_compile_definitions(testX11TimestampUpdate PRIVATE KWINBACKENDPATH="${CMAKE_BINARY_DIR}/plugins/platforms/x11/standalone/KWinX11Platform.so")
 target_link_libraries(testX11TimestampUpdate
     Qt5::Test
+    KF5::CoreAddons
     kwin
 )
 add_test(kwin-testX11TimestampUpdate testX11TimestampUpdate)
 ecm_mark_as_test(testX11TimestampUpdate)
 
 set(testOpenGLContextAttributeBuilder_SRCS
     opengl_context_attribute_builder_test.cpp
     ../abstract_opengl_context_attribute_builder.cpp
     ../egl_context_attribute_builder.cpp
 )
 
 if(HAVE_EPOXY_GLX)
     set(testOpenGLContextAttributeBuilder_SRCS ${testOpenGLContextAttributeBuilder_SRCS} ../plugins/platforms/x11/standalone/glx_context_attribute_builder.cpp)
 endif()
 add_executable(testOpenGLContextAttributeBuilder ${testOpenGLContextAttributeBuilder_SRCS})
 target_link_libraries(testOpenGLContextAttributeBuilder Qt5::Test)
 add_test(kwin-testOpenGLContextAttributeBuilder testOpenGLContextAttributeBuilder)
 ecm_mark_as_test(testOpenGLContextAttributeBuilder)
 
 set(testXkb_SRCS
     test_xkb.cpp
     ../xkb.cpp
 )
 add_executable(testXkb ${testXkb_SRCS})
 target_link_libraries(testXkb
     Qt5::Test
     Qt5::Gui
     Qt5::Widgets
     KF5::ConfigCore
     KF5::WindowSystem
     KF5::WaylandServer
     XKB::XKB
 )
 add_test(kwin-testXkb testXkb)
 ecm_mark_as_test(testXkb)
diff --git a/autotests/test_x11_timestamp_update.cpp b/autotests/test_x11_timestamp_update.cpp
index 50ba151d3..f3619d818 100644
--- a/autotests/test_x11_timestamp_update.cpp
+++ b/autotests/test_x11_timestamp_update.cpp
@@ -1,123 +1,126 @@
 /********************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.
 
 Copyright (C) 2017 Martin Gräßlin <mgraesslin@kde.org>
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.
 
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *********************************************************************/
 
 #include <QTest>
 #include <QX11Info>
 
+#include <KPluginMetaData>
+
 #include "main.h"
 #include "utils.h"
 
 namespace KWin
 {
 
 class X11TestApplication : public Application
 {
     Q_OBJECT
 public:
     X11TestApplication(int &argc, char **argv);
     virtual ~X11TestApplication();
 
 protected:
     void performStartup() override;
 
 };
 
 X11TestApplication::X11TestApplication(int &argc, char **argv)
     : Application(OperationModeX11, argc, argv)
 {
     setX11Connection(QX11Info::connection());
     setX11RootWindow(QX11Info::appRootWindow());
+    initPlatform(KPluginMetaData(QStringLiteral(KWINBACKENDPATH)));
 }
 
 X11TestApplication::~X11TestApplication()
 {
 }
 
 void X11TestApplication::performStartup()
 {
 }
 
 }
 
 class X11TimestampUpdateTest : public QObject
 {
     Q_OBJECT
 private Q_SLOTS:
     void testGrabAfterServerTime();
     void testBeforeLastGrabTime();
 };
 
 void X11TimestampUpdateTest::testGrabAfterServerTime()
 {
     // this test tries to grab the X keyboard with a timestamp in future
     // that should fail, but after updating the X11 timestamp, it should
     // work again
     KWin::updateXTime();
     QCOMPARE(KWin::grabXKeyboard(), true);
     KWin::ungrabXKeyboard();
 
     // now let's change the timestamp
     KWin::kwinApp()->setX11Time(KWin::xTime() + 5 * 60 * 1000);
 
     // now grab keyboard should fail
     QCOMPARE(KWin::grabXKeyboard(), false);
 
     // let's update timestamp, now it should work again
     KWin::updateXTime();
     QCOMPARE(KWin::grabXKeyboard(), true);
     KWin::ungrabXKeyboard();
 }
 
 void X11TimestampUpdateTest::testBeforeLastGrabTime()
 {
     // this test tries to grab the X keyboard with a timestamp before the
     // last grab time on the server. That should fail, but after updating the X11
     // timestamp it should work again
 
     // first set the grab timestamp
     KWin::updateXTime();
     QCOMPARE(KWin::grabXKeyboard(), true);
     KWin::ungrabXKeyboard();
 
     // now go to past
     const auto timestamp = KWin::xTime();
     KWin::kwinApp()->setX11Time(KWin::xTime() - 5 * 60 * 1000, KWin::Application::TimestampUpdate::Always);
     QCOMPARE(KWin::xTime(), timestamp - 5 * 60 * 1000);
 
     // now grab keyboard should fail
     QCOMPARE(KWin::grabXKeyboard(), false);
 
     // let's update timestamp, now it should work again
     KWin::updateXTime();
     QVERIFY(KWin::xTime() >= timestamp);
     QCOMPARE(KWin::grabXKeyboard(), true);
     KWin::ungrabXKeyboard();
 }
 
 int main(int argc, char *argv[])
 {
     setenv("QT_QPA_PLATFORM", "xcb", true);
     KWin::X11TestApplication app(argc, argv);
     app.setAttribute(Qt::AA_Use96Dpi, true);
     X11TimestampUpdateTest tc;
     return QTest::qExec(&tc, argc, argv);
 }
 
 #include "test_x11_timestamp_update.moc"