#include <QtCore>
#include <QtTest>

#include "Timer.h"

class TestTimer : public QObject {
		Q_OBJECT
	private slots:
		void resolution();
		void accuracy();
		void atomicity();
};

void TestTimer::accuracy() {
	QTime a;
	Timer t;

	a.restart();
	t.restart();
	do {
	} while (a.elapsed() < 1000);

	QVERIFY(abs(t.elapsed() / 1000ULL - a.elapsed()) < 10);
}

void TestTimer::resolution() {
	QTime a;
	Timer t;

	a.restart();
	t.restart();

	quint64 achange = 0;
	quint64 tchange = 0;

	quint64 aelapsed = 0, telapsed = 0;

	do {
		quint64 ae = a.elapsed();
		quint64 te = t.elapsed();
		if (ae != aelapsed)
			achange++;
		if (te != telapsed)
			tchange++;

		aelapsed = ae;
		telapsed = te;

	} while (achange < 10);

	QVERIFY(tchange > (achange * 100));
}

void TestTimer::atomicity() {
	QTime t;
	Timer a, b;

	a = b;

	quint64 ttime = 0;

	t.restart();
	do {
		ttime += a.restart();
	} while (t.elapsed() < 10);

	QCOMPARE(ttime, b.elapsed());
}

QTEST_MAIN(TestTimer)
#include "TestTimer.moc"