Qt Test

The Qt Test module provides classes for unit testing Qt applications and libraries. All public methods are in the QTest namespace. In addition, the QSignalSpy class provides easy introspection for Qt's signals and slots, and the QAbstractItemModelTester allows for non-destructive testing of item models.

Note: There is no binary compatibility guarantee for the Qt Test module. This means that an application that uses Qt Test is only guaranteed to work with the Qt version it was developed against. However, source compatibility is guaranteed.

Using the Module

Using a Qt module requires linking against the module library, either directly or through other dependencies. Several build tools have dedicated support for this, including CMake and qmake.

Building with CMake

Use the find_package() command to locate the needed module components in the Qt6 package:

find_package(Qt6 COMPONENTS Test REQUIRED)
target_link_libraries(mytarget PRIVATE Qt6::Test)

See also the Build with CMake overview.

Building with qmake

To configure the module for building with qmake, add the module as a value of the QT variable in the project's .pro file:

QT += testlib

Articles and Guides

Module Evolution

Changes to Qt Test lists important changes in the module API and functionality that were done for the Qt 6 series of Qt.

Licenses and Attributions

Qt Test is available under commercial licenses from The Qt Company. In addition, it is available under free software licenses: The GNU Lesser General Public License, version 3, or the GNU General Public License, version 2. See Qt Licensing for further details.

Furthermore, Qt Test in Qt 6.0.1 may contain third party modules under following permissive licenses:

Catch2, version 2.11.1

Boost Software License 1.0


MIT License

Linux Performance Events, version 3.7

GNU General Public License v2.0 only with Linux Syscall Note

Valgrind, version 3.14.0

BSD 4-clause "Original" or "Old" License


The Qt Quick Test module enables unit testing Qt Quick applications.

© 2021 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.