path: root/tests/auto/testlib/initmain
diff options
authorFriedemann Kleint <>2019-07-30 10:16:53 +0200
committerFriedemann Kleint <>2019-08-13 19:07:05 +0200
commitecb6327762e58a83309027da90ebb953411a264e (patch)
tree169dfa41a4e5053e45e681d707f8adc0fba54a9f /tests/auto/testlib/initmain
parent02ae522f54e93af46fb7cae5fcbc630a804cab50 (diff)
QTestLib: Introduce initMain() to run in main before qApp exists
When running Qt autotests on a developer machine with a high resolution, failures occur due to either some widget becoming too small, some rounding fuzz appearing when Qt High DPI scaling is active, or some test taking screenshots failing to deal with device pixel ratios != 1 in the obtained pixmaps. It is not feasible to adapt all tests to pass on high resolution monitors in both modes (Qt High DPI scaling enabled/disabled). It should be possible to specify the High DPI setting per test. Previously, it was not possible to set the Qt High DPI scaling attributes since they must be applied before QApplication instantiation. Enable this by checking for the presence of a static void initMain() function on the test object and invoking it before QApplication instantiation. Prototypically use it in tst_qtimer and to turn off High DPI scaling for tst_QGL. [ChangeLog][QtTestLib] It is now possible to perform static initialization before QApplication instantiation by implementing a initMain() function in the test class. Change-Id: Idec0134b189710a14c41a451fa8445bc0c5b1cf3 Reviewed-by: Volker Hilsheimer <> Reviewed-by: Paul Wicking <> Reviewed-by: Edward Welbourne <>
Diffstat (limited to 'tests/auto/testlib/initmain')
2 files changed, 61 insertions, 0 deletions
diff --git a/tests/auto/testlib/initmain/ b/tests/auto/testlib/initmain/
new file mode 100644
index 0000000000..4c12aba08d
--- /dev/null
+++ b/tests/auto/testlib/initmain/
@@ -0,0 +1,5 @@
+CONFIG += testcase
+SOURCES += tst_initmain.cpp
+QT = core testlib
+TARGET = tst_initmain
diff --git a/tests/auto/testlib/initmain/tst_initmain.cpp b/tests/auto/testlib/initmain/tst_initmain.cpp
new file mode 100644
index 0000000000..f08f82c5ec
--- /dev/null
+++ b/tests/auto/testlib/initmain/tst_initmain.cpp
@@ -0,0 +1,56 @@
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact:
+** This file is part of the test suite of the Qt Toolkit.
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see For further
+** information use the contact form at
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met:
+#include <QtCore/QCoreApplication>
+#include <QtTest/QtTest>
+class tst_InitMain : public QObject
+ static void initMain() { m_initMainCalled = true; }
+private slots:
+ void testcase();
+ static bool m_initMainCalled;
+bool tst_InitMain::m_initMainCalled = false;
+void tst_InitMain::testcase()
+ QVERIFY(m_initMainCalled);
+#include "tst_initmain.moc"