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++ // Copyright (C) 2025 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++
++ #include <QtFFmpegMediaPluginImpl/private/qffmpeg_p.h>
++ #include <QtTest/qtest.h>
++ #include <QtCore/qobject.h>
++
++ extern "C" {
++ #include "libavutil/mathematics.h"
++ }
++
++
++ class tst_qffmpegmath : public QObject
++ {
++ Q_OBJECT
++
++ private slots:
++ void mul_agreesWith_av_rescale_withFiniteNumbers() {
++ for (qint64 number = -20; number < 30; ++number) {
++ const std::optional<qint64> actual = QFFmpeg::mul(number, AVRational{ 1, 10 });
++ QVERIFY(actual);
++ const qint64 expected = av_rescale(number, 1, 10);
++ QCOMPARE_EQ(actual, expected);
++ }
++ }
++ };
++
++ QTEST_GUILESS_MAIN(tst_qffmpegmath)
++
++ #include "tst_qffmpegmath.moc"