qt5base-lts/tests/manual/qnetworkconfigurationmanager/main.cpp

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#include <QDebug>
#include <qtest.h>
#include <QtTest/QtTest>
#include <QtNetwork/qnetworkconfigmanager.h>

class tst_qnetworkconfigurationmanager : public QObject
{
    Q_OBJECT

private slots:
    void isOnline();
};

class SignalHandler : public QObject
{
    Q_OBJECT

public slots:
    void onOnlineStateChanged(bool isOnline)
    {
        qDebug() << "Online state changed to:" << isOnline;
    }
};

void tst_qnetworkconfigurationmanager::isOnline()
{
    QNetworkConfigurationManager manager;
    qDebug() << "Testing QNetworkConfigurationManager online status reporting functionality.";
    qDebug() << "This should tell the current online state:" << manager.isOnline();
    qDebug() << "Now please plug / unplug the network cable, and check the state update signal.";
    qDebug() << "Note that there might be some delays before you see the change, depending on the backend.";

    SignalHandler signalHandler;
    connect(&manager, SIGNAL(onlineStateChanged(bool)), &signalHandler, SLOT(onOnlineStateChanged(bool)));

    // event loop
    QTestEventLoop::instance().enterLoop(30);
    QVERIFY(QTestEventLoop::instance().timeout());
}

QTEST_MAIN(tst_qnetworkconfigurationmanager)

#include "main.moc"