qt5base-lts/tests/auto/dbus/qdbusconnection_delayed/tst_qdbusconnection_delayed.cpp

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#include <QtDBus>
#include <QtTest>

#ifdef Q_OS_WIN
#  include <process.h>
#  define getpid _getpid
#else
#  include <sys/types.h>
#  include <unistd.h>
#endif

class tst_QDBusConnection_Delayed : public QObject
{
    Q_OBJECT
private slots:
    void delayedMessages();
};

class Foo : public QObject
{
    Q_OBJECT
    Q_CLASSINFO("D-Bus Interface", "org.qtproject.tst_qdbusconnection_delayed.Foo")
public slots:
    int bar() { return 42; }
};

static bool executedOnce = false;

void tst_QDBusConnection_Delayed::delayedMessages()
{
    if (executedOnce)
        QSKIP("This test can only be executed once");
    executedOnce = true;

    int argc = 1;
    char *argv[] = { const_cast<char *>("tst_qdbusconnection_delayed"), 0 };
    QCoreApplication app(argc, argv);

    QDBusConnection session = QDBusConnection::sessionBus();
    QVERIFY(session.isConnected());
    QVERIFY(!session.baseService().isEmpty());

    QDBusConnection other = QDBusConnection::connectToBus(QDBusConnection::SessionBus, "other");
    QVERIFY(other.isConnected());
    QVERIFY(!other.baseService().isEmpty());

    QString name = "org.qtproject.tst_qdbusconnection_delayed-" +
                   QString::number(getpid());

    // acquire a name in the main session bus connection
    QVERIFY(session.registerService(name));
    QVERIFY(other.interface()->isServiceRegistered(name));

    // make an asynchronous call to a yet-unregistered object
    QDBusPendingCallWatcher pending(other.asyncCall(QDBusMessage::createMethodCall(name, "/foo", QString(), "bar")));

    // sleep the main thread without running the event loop;
    // the call must not be delivered
    QTest::qSleep(1000);
    QVERIFY(!pending.isFinished());

    // now register the object
    Foo foo;
    session.registerObject("/foo", &foo, QDBusConnection::ExportAllSlots);

    connect(&pending, &QDBusPendingCallWatcher::finished,
            &QTestEventLoop::instance(), &QTestEventLoop::exitLoop);
    QTestEventLoop::instance().enterLoop(2);
    QVERIFY(!QTestEventLoop::instance().timeout());
    QVERIFY(pending.isFinished());
    QVERIFY2(!pending.isError(), pending.error().name().toLatin1());
    QVERIFY(!pending.reply().arguments().isEmpty());
    QCOMPARE(pending.reply().arguments().at(0), QVariant(42));
}

QTEST_APPLESS_MAIN(tst_QDBusConnection_Delayed)

#include "tst_qdbusconnection_delayed.moc"