How can I get access to a QMessageBox by QTest

Question

I am creating some automated GUI tests in my application using QTest.

I can access the widgets from my application using the command:

savePushButton = mainWindow->findChild<QPushButton *>("savePushButton");

It is working fine, but now I have to click on the OK button of a QMessageBox.

I created the QMessageBox in my application like this:

if( something_wrong )
{
    QMessageBox::warning(new Widget(), "Title", "Something wrong!");
}

How can I have access to this QMessageBox, and its buttons?

Answer 1

I found a solution on the following link: http://www.qtcentre.org/threads/31239-Testing-modal-dialogs-with-QTestLib .

It uses the command QApplication::topLevelWidgets(); to get a widget list. Then it searches for the message box widget and simulates a key enter (QTest::keyClick(mb, Qt::Key_Enter);) which closes the message box.

Example:

void MyTest::testDialog()
{
    QTimer::singleShot(500, this, SLOT(timeOut()));
    QVERIFY(functionThatProducesMessageBox());
}

void MyTest::timeOut()
{
    QWidgetList allToplevelWidgets = QApplication::topLevelWidgets();
    foreach (QWidget *w, allToplevelWidgets) {
        if (w->inherits("QMessageBox")) {
            QMessageBox *mb = qobject_cast<QMessageBox *>(w);
            QTest::keyClick(mb, Qt::Key_Enter);
        }
    }
}

The header file must contain the Q_OBJECT macro to use the signals and slots mechanism. Example:

class MyClass: public QWidget
{
    Q_OBJECT
public:
    ...

It worked well for me since the UI (thread) is blocked when the message box appears.

Note: remember to rebuild the project when you add the Q_OBJECT macro.