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diff --git a/tests/auto/quickcontrols2/shared/dialogtestutil.h b/tests/auto/quickcontrols2/shared/dialogtestutil.h
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+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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.LGPLv3 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.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 later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QQUICKDIALOGTESTUTIL_H
+#define QQUICKDIALOGTESTUTIL_H
+
+#include <QtQuickTemplates2/private/qquickapplicationwindow_p.h>
+
+#include "util.h"
+#include "visualtestutil.h"
+
+// We need these for Windows, because FolderListModel returns a lowercase drive letter; e.g.:
+// "file:///c:/blah.txt", whereas other API returns "file:///C:/blah.txt".
+#define COMPARE_URL(url1, url2) \
+    QCOMPARE(QFileInfo(url1.toLocalFile()).absoluteFilePath(), QFileInfo(url2.toLocalFile()).absoluteFilePath());
+
+// Store a copy of the arguments in case { ... } list initializer syntax is used as an argument,
+// which could result in two different lists being created and passed to std::transform()
+// (and would also require it to be enclosed in parentheses everywhere it's used).
+#define COMPARE_URLS(actualUrls, expectedUrls) \
+{ \
+    const QList<QUrl> actualUrlsCopy = actualUrls; \
+    QList<QString> actualPaths; \
+    std::transform(actualUrlsCopy.begin(), actualUrlsCopy.end(), std::back_insert_iterator(actualPaths), \
+        [](const QUrl &url) { return QFileInfo(url.toLocalFile()).absoluteFilePath(); }); \
+    const QList<QUrl> expectedUrlsCopy = expectedUrls; \
+    QList<QString> expectedPaths; \
+    std::transform(expectedUrlsCopy.begin(), expectedUrlsCopy.end(), std::back_insert_iterator(expectedPaths), \
+        [](const QUrl &url) { return QFileInfo(url.toLocalFile()).absoluteFilePath(); }); \
+    QCOMPARE(actualPaths, expectedPaths); \
+}
+
+namespace QQuickDialogTestUtil
+{
+
+// Saves duplicating a bunch of code in every test.
+template<typename DialogType, typename QuickDialogType>
+class DialogTestHelper
+{
+public:
+    DialogTestHelper(QQmlDataTest *testCase, const QString &testFilePath,
+            const QStringList &qmlImportPaths = {}, const QVariantMap &initialProperties = {}) :
+        appHelper(testCase, testFilePath, qmlImportPaths, initialProperties)
+    {
+        if (!appHelper.ready)
+            return;
+
+        dialog = appHelper.window->property("dialog").value<DialogType*>();
+        if (!dialog) {
+            appHelper.errorMessage = "\"dialog\" property is not valid";
+            return;
+        }
+
+        appHelper.window->show();
+        appHelper.window->requestActivate();
+    }
+
+    Q_REQUIRED_RESULT bool isWindowInitialized() const
+    {
+        return appHelper.ready;
+    }
+
+    Q_REQUIRED_RESULT bool waitForWindowActive()
+    {
+        return QTest::qWaitForWindowActive(appHelper.window);
+    }
+
+    bool openDialog()
+    {
+        dialog->open();
+        if (!dialog->isVisible()) {
+            appHelper.errorMessage = "Dialog is not visible";
+            return false;
+        }
+
+        // We might want to call this function more than once,
+        // and we only need to get these members the first time.
+        if (!quickDialog) {
+            quickDialog = appHelper.window->findChild<QuickDialogType*>();
+            if (!quickDialog) {
+                appHelper.errorMessage = "Can't find Qt Quick-based dialog";
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    bool isQuickDialogOpen() const
+    {
+        return quickDialog->isOpened();
+    }
+
+    QQuickWindow *window() const
+    {
+        return appHelper.window;
+    }
+
+    const char *failureMessage() const
+    {
+        return appHelper.errorMessage.constData();
+    }
+
+    QQuickVisualTestUtil::QQuickApplicationHelper appHelper;
+    DialogType *dialog = nullptr;
+    QuickDialogType *quickDialog = nullptr;
+};
+
+}
+
+#endif // QQUICKDIALOGTESTUTIL_H