diff --git a/src/testlib/doc/src/qttestlib-manual.qdoc b/src/testlib/doc/src/qttestlib-manual.qdoc
index 71b4541313..65836d0706 100644
--- a/src/testlib/doc/src/qttestlib-manual.qdoc
+++ b/src/testlib/doc/src/qttestlib-manual.qdoc
@@ -107,6 +107,11 @@
     Example:
     \snippet code/doc_src_qtestlib.cpp 0
 
+    Finally, if the test class has a static public \c{void initMain()} method,
+    it is called by the QTEST_MAIN macros before the QApplication object
+    is instantiated. For example, this allows for setting application
+    attributes like Qt::AA_DisableHighDpiScaling. This was added in 5.14.
+
     For more examples, refer to the \l{Qt Test Tutorial}.
 
     \if !defined(qtforpython)
diff --git a/src/testlib/qtest.h b/src/testlib/qtest.h
index cdf0800371..27fe08e8f4 100644
--- a/src/testlib/qtest.h
+++ b/src/testlib/qtest.h
@@ -379,8 +379,36 @@ inline bool qCompare(quint32 const &t1, quint64 const &t2, const char *actual,
 {
     return qCompare(static_cast<quint64>(t1), t2, actual, expected, file, line);
 }
+namespace Internal {
 
+template <typename T>
+class HasInitMain // SFINAE test for the presence of initMain()
+{
+private:
+    using YesType = char[1];
+    using NoType = char[2];
+
+    template <typename C> static YesType& test( decltype(&C::initMain) ) ;
+    template <typename C> static NoType& test(...);
+
+public:
+    enum { value = sizeof(test<T>(nullptr)) == sizeof(YesType) };
+};
+
+template<typename T>
+typename std::enable_if<HasInitMain<T>::value, void>::type callInitMain()
+{
+    T::initMain();
 }
+
+template<typename T>
+typename std::enable_if<!HasInitMain<T>::value, void>::type callInitMain()
+{
+}
+
+} // namespace Internal
+
+} // namespace QTest
 QT_END_NAMESPACE
 
 #ifdef QT_TESTCASE_BUILDDIR
@@ -441,6 +469,7 @@ int main(int argc, char *argv[]) \
 
 #define QTEST_MAIN_IMPL(TestObject) \
     TESTLIB_SELFCOVERAGE_START(#TestObject) \
+    QT_PREPEND_NAMESPACE(QTest::Internal::callInitMain)<TestObject>(); \
     QApplication app(argc, argv); \
     app.setAttribute(Qt::AA_Use96Dpi, true); \
     QTEST_DISABLE_KEYPAD_NAVIGATION \
@@ -454,6 +483,7 @@ int main(int argc, char *argv[]) \
 
 #define QTEST_MAIN_IMPL(TestObject) \
     TESTLIB_SELFCOVERAGE_START(#TestObject) \
+    QT_PREPEND_NAMESPACE(QTest::Internal::callInitMain)<TestObject>(); \
     QGuiApplication app(argc, argv); \
     app.setAttribute(Qt::AA_Use96Dpi, true); \
     TestObject tc; \
@@ -464,6 +494,7 @@ int main(int argc, char *argv[]) \
 
 #define QTEST_MAIN_IMPL(TestObject) \
     TESTLIB_SELFCOVERAGE_START(#TestObject) \
+    QT_PREPEND_NAMESPACE(QTest::Internal::callInitMain)<TestObject>(); \
     QCoreApplication app(argc, argv); \
     app.setAttribute(Qt::AA_Use96Dpi, true); \
     TestObject tc; \
@@ -482,6 +513,7 @@ int main(int argc, char *argv[]) \
 int main(int argc, char *argv[]) \
 { \
     TESTLIB_SELFCOVERAGE_START(#TestObject) \
+    QT_PREPEND_NAMESPACE(QTest::Internal::callInitMain)<TestObject>(); \
     QCoreApplication app(argc, argv); \
     app.setAttribute(Qt::AA_Use96Dpi, true); \
     TestObject tc; \
diff --git a/tests/auto/corelib/kernel/qtimer/tst_qtimer.cpp b/tests/auto/corelib/kernel/qtimer/tst_qtimer.cpp
index 262dbea913..8e0bdac520 100644
--- a/tests/auto/corelib/kernel/qtimer/tst_qtimer.cpp
+++ b/tests/auto/corelib/kernel/qtimer/tst_qtimer.cpp
@@ -47,7 +47,11 @@
 class tst_QTimer : public QObject
 {
     Q_OBJECT
+public:
+    static void initMain();
+
 private slots:
+    void cleanupTestCase();
     void zeroTimer();
     void singleShotTimeout();
     void timeout();
@@ -1138,22 +1142,27 @@ struct StaticSingleShotUser
     }
 };
 
+// NOTE: to prevent any static initialization order fiasco, we implement
+//       initMain() to instantiate staticSingleShotUser before qApp
+
 static StaticSingleShotUser *s_staticSingleShotUser = nullptr;
 
+void tst_QTimer::initMain()
+{
+    s_staticSingleShotUser = new StaticSingleShotUser;
+}
+
+void tst_QTimer::cleanupTestCase()
+{
+    delete s_staticSingleShotUser;
+}
+
 void tst_QTimer::singleShot_static()
 {
     QCoreApplication::processEvents();
     QCOMPARE(s_staticSingleShotUser->helper.calls, s_staticSingleShotUser->calls());
 }
 
-// NOTE: to prevent any static initialization order fiasco, we handle QTEST_MAIN
-//       ourselves, but instantiate the staticSingleShotUser before qApp
-
-int main(int argc, char *argv[])
-{
-    StaticSingleShotUser staticSingleShotUser;
-    s_staticSingleShotUser = &staticSingleShotUser;
-    QTEST_MAIN_IMPL(tst_QTimer)
-}
+QTEST_MAIN(tst_QTimer)
 
 #include "tst_qtimer.moc"
diff --git a/tests/auto/opengl/qgl/tst_qgl.cpp b/tests/auto/opengl/qgl/tst_qgl.cpp
index 053c4b026b..3cc9592fb1 100644
--- a/tests/auto/opengl/qgl/tst_qgl.cpp
+++ b/tests/auto/opengl/qgl/tst_qgl.cpp
@@ -60,6 +60,8 @@ public:
     tst_QGL();
     virtual ~tst_QGL();
 
+    static void initMain();
+
 private slots:
     void initTestCase();
     void getSetCheck();
@@ -101,6 +103,11 @@ tst_QGL::~tst_QGL()
 {
 }
 
+void tst_QGL::initMain()
+{
+    QCoreApplication::setAttribute(Qt::AA_DisableHighDpiScaling);
+}
+
 void tst_QGL::initTestCase()
 {
     QGLWidget glWidget;
diff --git a/tests/auto/testlib/initmain/initmain.pro b/tests/auto/testlib/initmain/initmain.pro
new file mode 100644
index 0000000000..4c12aba08d
--- /dev/null
+++ b/tests/auto/testlib/initmain/initmain.pro
@@ -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: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** 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 https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** 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: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+
+#include <QtCore/QCoreApplication>
+#include <QtTest/QtTest>
+
+class tst_InitMain : public QObject
+{
+    Q_OBJECT
+
+public:
+    static void initMain() { m_initMainCalled = true; }
+
+private slots:
+    void testcase();
+
+private:
+    static bool m_initMainCalled;
+};
+
+bool tst_InitMain::m_initMainCalled = false;
+
+void tst_InitMain::testcase()
+{
+    QVERIFY(m_initMainCalled);
+}
+
+QTEST_MAIN(tst_InitMain)
+
+#include "tst_initmain.moc"
diff --git a/tests/auto/testlib/testlib.pro b/tests/auto/testlib/testlib.pro
index 587c76a189..55f1f9b87b 100644
--- a/tests/auto/testlib/testlib.pro
+++ b/tests/auto/testlib/testlib.pro
@@ -1,5 +1,6 @@
 TEMPLATE = subdirs
 SUBDIRS = \
+   initmain \
    outformat \
    qsignalspy \
    selftests \