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//! [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]