CODEWITHSUNDEEP
c++qtqt5qwidgetqtestlib
Libor Tomsik
Libor Tomsik

Reputation: 718

QTest covering paint method

I have custom QWidgets where all the painting is done manually (fillRect, drawRect, drawText, drawPixmap..) . There are up to 120 properties affecting what's going to be paint, how it's blinking and so on. Legacy spaghetti code.

When I'm changing something I would like to first test cover old functionality. Is there a recommended way how to cover QWidget::paintEvent(QPaintEvent* event) with unit tests? Do I have to mock QPainter, or is there a way for checking paintEvent output?

How you are covering paintEvetnt with tests?

Upvotes: 0

Views: 410

Answers (1)

Libor Tomsik
Libor Tomsik

Reputation: 718

Finally storing and comparing images like:

auto configuredImage = widgetUnderTest->grab().toImage();
QImage sampleImage;      
sampleImage.load("src/Images/configuredImage.png");
QCOMPARE(configuredImage, sampleImage);

Upvotes: 1

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