pytest-qt

pytest-qt is a pytest plugin that allows programmers to write tests for PyQt5, PyQt6, PySide2 and PySide6 applications.

The main usage is to use the qtbot fixture, responsible for handling qApp creation as needed and provides methods to simulate user interaction, like key presses and mouse clicks:

def test_hello(qtbot):
    widget = HelloWidget()
    qtbot.addWidget(widget)

    # click in the Greet button and make sure it updates the appropriate label
    qtbot.mouseClick(widget.button_greet, qt_api.QtCore.Qt.MouseButton.LeftButton)

    assert widget.greet_label.text() == "Hello!"

This allows you to test and make sure your view layer is behaving the way you expect after each code change.

Features

qtbot fixture to simulate user interaction with Qt widgets.
Automatic capture of qDebug, qWarning and qCritical messages;
waitSignal and waitSignals functions to block test execution until specific signals are emitted.
Exceptions in virtual methods and slots are automatically captured and fail tests accordingly.

Requirements

Since version 4.1.0, pytest-qt requires Python 3.7+.

Works with either PySide6, PySide2, PyQt6 or PyQt5.

If any of the above libraries is already imported by the time the tests execute, that library will be used.

If not, pytest-qt will try to import and use the Qt APIs, in this order:

PySide6
PySide2
PyQt6
PyQt5

To force a particular API, set the configuration variable qt_api in your pytest.ini file to pyside6, pyside2, pyqt6 or pyqt5:

[pytest]
qt_api=pyqt5

Alternatively, you can set the PYTEST_QT_API environment variable to the same values described above (the environment variable wins over the configuration if both are set).

Documentation

Full documentation and tutorial available at Read the Docs.

Change Log

Please consult the changelog page.

Bugs/Requests

Please report any issues or feature requests in the issue tracker.

Contributing

Contributions are welcome, so feel free to submit a bug or feature request.

Pull requests are highly appreciated! If you can, include some tests that exercise the new code or test that a bug has been fixed, and make sure to include yourself in the contributors list. :)

To prepare your environment, create a virtual environment and install pytest-qt in editable mode with dev extras:

$ pip install --editable .[dev]

After that install pre-commit for pre-commit checks:

$ pre-commit install

Running tests

Tests are run using tox:

$ tox -e py37-pyside2,py37-pyqt5

pytest-qt is formatted using black and uses pre-commit for linting checks before commits. You can install pre-commit locally with:

$ pip install pre-commit
$ pre-commit install

Related projects

pytest-xvfb allows to run a virtual xserver (Xvfb) on Linux to avoid GUI elements popping up on the screen or for easy CI testing
pytest-qml allows running QML tests from pytest