qt5base-lts/tests/auto/gui/kernel/qrasterwindow/tst_qrasterwindow.cpp

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#include <QtGui/QRasterWindow>
#include <QtTest/QtTest>
#include <QtGui/QPainter>

class tst_QRasterWindow : public QObject
{
    Q_OBJECT

private slots:
    void create();
    void basic();
};

void tst_QRasterWindow::create()
{
    QRasterWindow w;

    w.resize(640, 480);
    w.show();

    QTest::qWaitForWindowExposed(&w);
}

class PainterWindow : public QRasterWindow
{
public:
    void reset() { paintCount = 0; }

    void paintEvent(QPaintEvent*) Q_DECL_OVERRIDE {
        ++paintCount;
        QPainter p(this);
        p.fillRect(QRect(0, 0, 100, 100), Qt::blue);
        p.end();
    }

    int paintCount;
};

void tst_QRasterWindow::basic()
{
    PainterWindow w;
    w.reset();
    w.resize(400, 400);
    w.show();
    QTest::qWaitForWindowExposed(&w);

    QVERIFY(w.paintCount >= 1);

    w.reset();
    w.update();
    int maxWait = 1000;
    while (w.paintCount == 0 && --maxWait > 0)
        QTest::qWait(10);

    QVERIFY(w.paintCount >= 1);
}

#include <tst_qrasterwindow.moc>

QTEST_MAIN(tst_QRasterWindow)