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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtCore/QCoreApplication>
#include <QtTest/QtTest>
#include <QDebug>
class tst_float: public QObject
{
Q_OBJECT
private slots:
void floatComparisons() const;
void floatComparisons_data() const;
void compareFloatTests() const;
void compareFloatTests_data() const;
};
void tst_float::floatComparisons() const
{
QFETCH(float, operandLeft);
QFETCH(float, operandRight);
QCOMPARE(operandLeft, operandRight);
}
void tst_float::floatComparisons_data() const
{
QTest::addColumn<float>("operandLeft");
QTest::addColumn<float>("operandRight");
QTest::newRow("should SUCCEED 1")
<< float(0)
<< float(0);
QTest::newRow("should FAIL 1")
<< float(1.00000)
<< float(3.00000);
QTest::newRow("should FAIL 2")
<< float(1.00000e-7f)
<< float(3.00000e-7f);
// QCOMPARE for floats uses qFuzzyCompare(), which succeeds if the numbers
// differ by no more than 1/100,000th of the smaller value. Thus
// QCOMPARE(99998, 99999) should fail, while QCOMPARE(100001, 100002)
// should pass.
QTest::newRow("should FAIL 3")
<< float(99998)
<< float(99999);
QTest::newRow("should SUCCEED 2")
<< float(100001)
<< float(100002);
}
void tst_float::compareFloatTests() const
{
QFETCH(float, t1);
// Create two more values
// t2 differs from t1 by 1 ppm (part per million)
// t3 differs from t1 by 200%
// we should consider that t1 == t2 and t1 != t3
const float t2 = t1 + (t1 / 1e6);
const float t3 = 3 * t1;
QCOMPARE(t1, t2);
/* Should FAIL. */
QCOMPARE(t1, t3);
}
void tst_float::compareFloatTests_data() const
{
QTest::addColumn<float>("t1");
QTest::newRow("1e0") << 1e0f;
QTest::newRow("1e-7") << 1e-7f;
QTest::newRow("1e+7") << 1e+7f;
}
QTEST_MAIN(tst_float)
#include "tst_float.moc"
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