QQuickFlickable is hard to test with wheel events on macOS

#include <QtTest>
#include <QtQuick>

class tst_Flickable : public QObject
{
    Q_OBJECT

private slots:
    void wheel();
};

static bool sendWheelEvent(QQuickItem *item, const QPoint &localPos, int degrees)
{
    QQuickWindow *window = item->window();
    QWheelEvent wheelEvent(localPos, item->window()->mapToGlobal(localPos), QPoint(0, 0), QPoint(0, 8 * degrees), 0, Qt::Vertical, Qt::NoButton, 0);
    QSpontaneKeyEvent::setSpontaneous(&wheelEvent);
    return qGuiApp->notify(window, &wheelEvent);
}

void tst_Flickable::wheel()
{
    QQmlEngine engine;
    QQmlComponent component(&engine);

    component.setData("import QtQuick 2.6;"
                      "import QtQuick.Window 2.2;"
                      "Window {"
                      "    width: 400; height: 400;"
                      "    property alias listView: listView;"
                      "    ListView {"
                      "        id: listView;"
                      "        model: 100;"
                      "        anchors.fill: parent;"
                      "        delegate: Text {"
                      "            width: parent.width;"
                      "            text: index;"
                      "        }"
                      "        onContentYChanged: console.log('onContentYChanged', contentY, this);"
                      "        onMovementStarted: console.log('onMovementStarted', this);"
                      "        onMovementEnded: console.log('onMovementEnded', this);"
                      "        onMovingChanged: console.log('onMovingChanged', moving, this);"
                      "    }"
                      "}", QUrl());

    QQuickWindow *window = qobject_cast<QQuickWindow *>(component.create());
    QVERIFY(window);
    window->show();
    QVERIFY(QTest::qWaitForWindowExposed(window));

    QQuickItem *listView = window->property("listView").value<QQuickItem*>();
    QVERIFY(listView);

    QSignalSpy movingChanged(listView, SIGNAL(movingChanged()));
    QSignalSpy movementStartedSpy(listView, SIGNAL(movementStarted()));
    QSignalSpy movementEndedSpy(listView, SIGNAL(movementEnded()));
    QVERIFY(movingChanged.isValid() && movementStartedSpy.isValid() && movementEndedSpy.isValid());

    // send a wheel event
    QVERIFY(sendWheelEvent(listView, QPoint(listView->width() / 2, listView->height() / 2), -15));

    // check that the content starts moving
    QVERIFY(listView->property("moving").toBool());
    QCOMPARE(movingChanged.count(), 1);
    QCOMPARE(movementStartedSpy.count(), 1);
    QCOMPARE(movementEndedSpy.count(), 0);

    // wait until the movement ends
    QTRY_VERIFY(!listView->property("moving").toBool());
    QCOMPARE(movingChanged.count(), 2);
    QCOMPARE(movementStartedSpy.count(), 1);
    QCOMPARE(movementEndedSpy.count(), 1);

    // wait a bit and see if it still moves
    qreal before = listView->property("contentY").toReal();
    QTest::qWait(500);
    qreal after = listView->property("contentY").toReal();

    QCOMPARE(after, before); // fail
}

QTEST_MAIN(tst_Flickable)

#include "tst_flickable.moc"