How do I create a pause/wait function using Qt?

Question

I\'m playing around with Qt, and I want to create a simple pause between two commands. However it won\'t seem to let me use Sleep(int mili);, and I can\'t find

Answer 1

Since you're trying to "test some class code," I'd really recommend learning to use QTestLib. It provides a QTest namespace and a QtTest module that contain a number of useful functions and objects, including QSignalSpy that you can use to verify that certain signals are emitted.

Since you will eventually be integrating with a full GUI, using QTestLib and testing without sleeping or waiting will give you a more accurate test -- one that better represents the true usage patterns. But, should you choose not to go that route, you could use QTestLib::qSleep to do what you've requested.

Since you just need a pause between starting your pump and shutting it down, you could easily use a single shot timer:

class PumpTest: public QObject {
    Q_OBJECT
    Pump &pump;
public:
    PumpTest(Pump &pump):pump(pump) {};
public slots:
    void start() { pump.startpump(); }
    void stop() { pump.stoppump(); }
    void stopAndShutdown() {
        stop();
        QCoreApplication::exit(0);
    }
    void test() {
        start();
        QTimer::singleShot(1000, this, SLOT(stopAndShutdown));
    }
};

int main(int argc, char* argv[]) {
    QCoreApplication app(argc, argv);
    Pump p;
    PumpTest t(p);
    t.test();
    return app.exec();
}

But qSleep() would definitely be easier if all you're interested in is verifying a couple of things on the command line.

EDIT: Based on the comment, here's the required usage patterns.

First, you need to edit your .pro file to include qtestlib:

CONFIG += qtestlib

Second, you need to include the necessary files:

• For the QTest namespace (which includes qSleep): #include
• For all the items in the QtTest module: #include . This is functionally equivalent to adding an include for each item that exists within the namespace.