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// Copyright 2005-2020 The Mumble Developers. All rights reserved.
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file at the root of the
// Mumble source tree or at <https://www.mumble.info/LICENSE>.
#include <QtCore>
#include <QtTest>
#include "Timer.h"
class TestTimer : public QObject {
Q_OBJECT
private slots:
void resolution();
void order();
};
// This tests that the timer implemented by the Timer
// class is a high resolution timer. In this case, we
// check that the output of the elapsed() method changes
// at least every 100 microseconds.
void TestTimer::resolution() {
Timer t;
t.restart();
quint64 nchanges = 0;
quint64 lastElapsed = 0;
quint64 curElapsed = 0;
do {
curElapsed = t.elapsed();
if (curElapsed != lastElapsed) {
nchanges++;
}
lastElapsed = curElapsed;
} while (curElapsed < 150000); // 150 ms
quint64 totalElapsed = t.elapsed();
double usecsPerChange = static_cast< double >(totalElapsed) / static_cast< double >(nchanges);
qWarning("Total elapsed time: %llu microseconds", static_cast< unsigned long long >(totalElapsed));
qWarning("Number of elapsed changes: %llu", static_cast< unsigned long long >(nchanges));
qWarning("Resolution: %.2f microseconds", usecsPerChange);
if (usecsPerChange >= 100.0f) {
QFAIL("Insufficient timer resolution. Got >= 100 usec, expected < 100 usec resolution...");
}
}
void TestTimer::order() {
Timer a;
while (a.elapsed() == 0) {
};
Timer b;
QVERIFY(a > b);
QVERIFY(!(b > a));
QVERIFY(!(a < b));
QVERIFY(b < a);
}
QTEST_MAIN(TestTimer)
#include "TestTimer.moc"
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