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diff --git a/src/corelib/kernel/qtestsupport_core.h b/src/corelib/kernel/qtestsupport_core.h
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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtTest module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** 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-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QTESTSUPPORT_CORE_H
+#define QTESTSUPPORT_CORE_H
+
+#include <QtCore/qcoreapplication.h>
+#include <QtCore/qdeadlinetimer.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QTestPrivate {
+Q_CORE_EXPORT void qSleep(int ms);
+}
+
+namespace QTest {
+
+template <typename Functor>
+Q_REQUIRED_RESULT static bool qWaitFor(Functor predicate, int timeout = 5000)
+{
+    // We should not spin the event loop in case the predicate is already true,
+    // otherwise we might send new events that invalidate the predicate.
+    if (predicate())
+        return true;
+
+    // qWait() is expected to spin the event loop, even when called with a small
+    // timeout like 1ms, so we we can't use a simple while-loop here based on
+    // the deadline timer not having timed out. Use do-while instead.
+
+    int remaining = timeout;
+    QDeadlineTimer deadline(remaining, Qt::PreciseTimer);
+
+    do {
+        QCoreApplication::processEvents(QEventLoop::AllEvents, remaining);
+        QCoreApplication::sendPostedEvents(nullptr, QEvent::DeferredDelete);
+
+        remaining = deadline.remainingTime();
+        if (remaining > 0)
+            QTestPrivate::qSleep(qMin(10, remaining));
+
+        if (predicate())
+            return true;
+
+        remaining = deadline.remainingTime();
+    } while (remaining > 0);
+
+    return predicate(); // Last chance
+}
+
+Q_CORE_EXPORT void qWait(int ms);
+
+} // namespace QTest
+
+QT_END_NAMESPACE
+
+#endif