qt5base-lts/tests/auto/qmath/tst_qmath.cpp

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#include <QtTest/QtTest>
#include <qmath.h>

static const qreal PI = 3.14159265358979323846264338327950288;

class tst_QMath : public QObject
{
    Q_OBJECT
private slots:
    void fastSinCos();
};

void tst_QMath::fastSinCos()
{
    // Test evenly spaced angles from 0 to 2pi radians.
    const int LOOP_COUNT = 100000;
    for (int i = 0; i < LOOP_COUNT; ++i) {
        qreal angle = i * 2 * PI / (LOOP_COUNT - 1);
        QVERIFY(qAbs(qSin(angle) - qFastSin(angle)) < 1e-5);
        QVERIFY(qAbs(qCos(angle) - qFastCos(angle)) < 1e-5);
    }
}

QTEST_APPLESS_MAIN(tst_QMath)

#include "tst_qmath.moc"