//! [0]
    QCheckBox *box = ...;
    QSignalSpy spy(box, SIGNAL(clicked(bool)));

    // do something that triggers the signal
    box->animateClick();

    QCOMPARE(spy.count(), 1); // make sure the signal was emitted exactly one time
    QList<QVariant> arguments = spy.takeFirst(); // take the first signal

    QVERIFY(arguments.at(0).toBool() == true); // verify the first argument
//! [0]


//! [1]
    QSignalSpy spy(myCustomObject, SIGNAL(mySignal(int, QString, double)));

    myCustomObject->doSomething(); // trigger emission of the signal

    QList<QVariant> arguments = spy.takeFirst();
    QVERIFY(arguments.at(0).type() == QVariant::Int);
    QVERIFY(arguments.at(1).type() == QVariant::QString);
    QVERIFY(arguments.at(2).type() == QVariant::double);
//! [1]


//! [2]
    qRegisterMetaType<QModelIndex>("QModelIndex");
    QSignalSpy spy(&model, SIGNAL(whatever(QModelIndex)));
//! [2]


//! [3]
    // get the first argument from the first received signal:
    QModelIndex result = qvariant_cast<QModelIndex>(spy.at(0).at(0));
//! [3]


//! [4]
    QSignalSpy spy(myPushButton, SIGNAL(clicked(bool)));
//! [4]


