Home · Examples 


Chapter 3: Simulating GUI Events

[Previous: Chapter 2: Data Driven Testing][QTestLib Tutorial][Next: Chapter 4: Replaying GUI Events]

QTestLib features some mechanisms to test graphical user interfaces. Instead of simulating native window system events, QTestLib sends internal Qt events. That means there are no side-effects on the machine the tests are running on.

In this chapter we will se how to write a simple GUI test.

Writing a GUI test

This time, let's assume you want to test the behavior of our QLineEdit class. As before, you will need a class that contains your test function:

The following code example is written in c++.
#include <QtGui>
#include <QtTest/QtTest>

class TestGui: public QObject
{
    Q_OBJECT

private slots:
    void testGui();

};
The only difference is that you need to include the QtGui class definitions in addition to the QTest namespace.

The following code example is written in c++.
void TestGui::testGui()
{
    QLineEdit lineEdit;

    QTest::keyClicks(&lineEdit, "hello world");

    QCOMPARE(lineEdit.text(), QString("hello world"));
}
In the implementation of the test function we first create a QLineEdit. Then we simulate writing "hello world" in the line edit using the QTest::keyClicks() function.

Note: The widget must also be shown in order to correctly test keyboard shortcuts.

QTest::keyClicks() simulates clicking a sequence of keys on a widget. Optionally, a keyboard modifier can be specified as well as a delay (in milliseconds) of the test after each key click. In a similar way, you can use the QTest::keyClick(), QTest::keyPress(), QTest::keyRelease(), QTest::mouseClick(), QTest::mouseDClick(), QTest::mouseMove(), QTest::mousePress() and QTest::mouseRelease() functions to simulate the associated GUI events.

Finally, we use the QCOMPARE() macro to check if the line edit's text is as expected.

As before, to make our test case a stand-alone executable, the following two lines are needed:

The following code example is written in c++.

QTEST_MAIN(TestGui)
#include "testgui.moc"
The QTEST_MAIN() macro expands to a simple main() method that runs all the test functions, and since both the declaration and the implementation of our test class are in a .cpp file, we also need to include the generated moc file to make Qt's introspection work.


Copyright © 2009 Nokia Corporation and/or its subsidiary(-ies) Trademarks
Qt Jambi 4.5.2_01