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    41 

    42 #include <QtCore/QString>

    43 #include <QtCore/QTime>

    44 #include <QtCore/QElapsedTimer>

    45 #include <QtTest/QtTest>

    46 

    47 static const int minResolution = 50; // the minimum resolution for the tests

    48 

    49 QDebug operator<<(QDebug s, const QElapsedTimer &t)

    50 {

    51     union {

    52         QElapsedTimer t;

    53         struct { qint64 t1, t2; } i;

    54     } copy;

    55     copy.t = t;

    56     s.nospace() << "(" <<  copy.i.t1 << ", " << copy.i.t2 << ")";

    57     return s.space();

    58 }

    59 

    60 class tst_QElapsedTimer : public QObject

    61 {

    62     Q_OBJECT

    63 

    64 private Q_SLOTS:

    65     void statics();

    66     void validity();

    67     void basics();

    68     void elapsed();

    69 };

    70 

    71 void tst_QElapsedTimer::statics()

    72 {

    73     qDebug() << "Clock type is" << QElapsedTimer::clockType();

    74     qDebug() << "Said clock is" << (QElapsedTimer::isMonotonic() ? "monotonic" : "not monotonic");

    75     QElapsedTimer t;

    76     t.start();

    77     qDebug() << "Current time is" << t.msecsSinceReference();

    78 }

    79 

    80 void tst_QElapsedTimer::validity()

    81 {

    82     QElapsedTimer t;

    83 

    84     t.invalidate();

    85     QVERIFY(!t.isValid());

    86 

    87     t.start();

    88     QVERIFY(t.isValid());

    89 

    90     t.invalidate();

    91     QVERIFY(!t.isValid());

    92 }

    93 

    94 void tst_QElapsedTimer::basics()

    95 {

    96     QElapsedTimer t1;

    97     t1.start();

    98 

    99     QVERIFY(t1.msecsSinceReference() != 0);

   100 

   101     QCOMPARE(t1, t1);

   102     QVERIFY(!(t1 != t1));

   103     QVERIFY(!(t1 < t1));

   104     QCOMPARE(t1.msecsTo(t1), qint64(0));

   105     QCOMPARE(t1.secsTo(t1), qint64(0));

   106 //    QCOMPARE(t1 + 0, t1);

   107 //    QCOMPARE(t1 - 0, t1);

   108 

   109 #if 0

   110     QElapsedTimer t2 = t1;

   111     t2 += 1000;   // so we can use secsTo

   112 

   113     QVERIFY(t1 != t2);

   114     QVERIFY(!(t1 == t2));

   115     QVERIFY(t1 < t2);

   116     QVERIFY(!(t2 < t1));

   117     QCOMPARE(t1.msecsTo(t2), qint64(1000));

   118     QCOMPARE(t1.secsTo(t2), qint64(1));

   119 //    QCOMPARE(t2 - t1, qint64(1000));

   120 //    QCOMPARE(t1 - t2, qint64(-1000));

   121 #endif

   122 

   123     quint64 value1 = t1.msecsSinceReference();

   124     qDebug() << value1 << t1;

   125     qint64 elapsed = t1.restart();

   126     QVERIFY(elapsed < minResolution);

   127 

   128     quint64 value2 = t1.msecsSinceReference();

   129     qDebug() << value2 << t1 << elapsed;

   130     // in theory, elapsed == value2 - value1

   131 

   132     // However, since QElapsedTimer keeps internally the full resolution,

   133     // we have here a rounding error due to integer division

   134     QVERIFY(qAbs(elapsed - qint64(value2 - value1)) <= 1);

   135 }

   136 

   137 void tst_QElapsedTimer::elapsed()

   138 {

   139     QElapsedTimer t1;

   140     t1.start();

   141 

   142     QTest::qSleep(4*minResolution);

   143     QElapsedTimer t2;

   144     t2.start();

   145 

   146     QVERIFY(t1 != t2);

   147     QVERIFY(!(t1 == t2));

   148     QVERIFY(t1 < t2);

   149     QVERIFY(t1.msecsTo(t2) > 0);

   150     // don't check: t1.secsTo(t2)

   151 //    QVERIFY(t1 - t2 < 0);

   152 

   153     QVERIFY(t1.elapsed() > 0);

   154     QVERIFY(t1.hasExpired(minResolution));

   155     QVERIFY(!t1.hasExpired(8*minResolution));

   156     QVERIFY(!t2.hasExpired(minResolution));

   157 

   158     QVERIFY(!t1.hasExpired(-1));

   159     QVERIFY(!t2.hasExpired(-1));

   160 

   161     qint64 elapsed = t1.restart();

   162     QVERIFY(elapsed > 3*minResolution);

   163     QVERIFY(elapsed < 5*minResolution);

   164     qint64 diff = t2.msecsTo(t1);

   165     QVERIFY(diff < minResolution);

   166 }

   167 

   168 QTEST_MAIN(tst_QElapsedTimer);

   169 

   170 #include "tst_qelapsedtimer.moc"