Inheritance and signals

VS IK

Hi.
I am currently trying to write a unittest for a class that uses my api class.
Because the server is not running while testing, i inherited from my api class and overwrote the functions used by the class to be tested. However I end up with a nasty exception.
To test what's wrong I coded a minimal example which demonstrates what I'm trying to accomplish:

Base class:

#ifndef TESTBASE_H
#define TESTBASE_H

#include <QObject>

class Api: public QObject {
    Q_OBJECT;
signals:
    void signalResponse(int i);

public:
    void foo() {
        //the network manager would be called here and its result would be handled
        //in a private slot, afterwards the signal below would be emitted to the
        //object using the api
        emit signalResponse(111);
    }
};

#endif // TESTBASE_H

Dummy class used in test:

#ifndef TESTCHILD_H
#define TESTCHILD_H
#include <QObject>
#include "TestBase.h"

class MockApi: public Api {
    Q_OBJECT;
public:
    void foo() {
        // to prevent exception due to failed network requests
        // this "mock" class just emits dummy data to the object using the api
        emit signalResponse(222);
    }
};

#endif // TESTCHILD_H

Test:

#ifndef TEST_H
#define TEST_H
#include <QObject>
#include "TestBase.h"
#include "TestChild.h"
#include <QDebug>

// not an actual unittest, just poc
class Test: public QObject {
    Q_OBJECT;
private:
    Api*test = new MockApi();
public:
    Test() {
        //using new object connect syntax does not work either
        connect(test, SIGNAL(signalResponse(int)), this, SLOT(slotTest(int)));
    }
    void foo() {
        test->foo();
    }
public slots:
    void slotTest(int i) {
        qDebug() << i; //prints 111 instead of expected 222
    }
};
#endif // TEST_H

Is what I am trying to do impossible?
And if so, why?

Thank ya'll in advance.

JKSH

@VS-IK said in Inheritance and signals:

//prints 111 instead of expected 222

That's because Api::foo() is not virtual. You can't override it.